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Nat' Assoc' of Criminal Defense Layers Without Intent Report on Congressional Dismantling of Criminal Intent Requirement 2010

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Without Intent
How Congress Is Eroding the
Criminal Intent Requirement in Federal Law

Brian W. Walsh and Tiffany M. Joslyn

Foreword by Edwin Meese III and Norman L. Reimer

Copyright © 2010 The Heritage Foundation and National Association of Criminal Defense Lawyers
This report is subject to a Creative Commons Attribution-Noncommercial-No Derivative Works license
(see http://www.creativecommons.org). It may be reproduced, provided that no charge is imposed, and
The Heritage Foundation and the National Association of Criminal Defense Lawyers are acknowledged
as the original publishers and the copyright holders. For any other form of reproduction, please contact
The Heritage Foundation or NACDL for permission.
Cover illustration by Natasha L. Efrat. Copyright © 2010 National Association of Criminal Defense Lawyers

Without Intent
How Congress Is Eroding the
Criminal Intent Requirement in Federal Law
Brian W. Walsh and Tiffany M. Joslyn

Foreword by Edwin Meese III and Norman L. Reimer

Cynthia Hujar Orr
President
National Association of
Criminal Defense Lawyers
San Antonio, Texas

Edwin J. Feulner
President
The Heritage Foundation
Washington, D.C.
Edwin Meese III
Chairman
Center for Legal & Judicial Studies
The Heritage Foundation
Washington, D.C.

Norman L. Reimer
Executive Director
National Association of
Criminal Defense Lawyers
Washington, D.C.

Todd F. Gaziano
Director
Center for Legal & Judicial Studies
The Heritage Foundation
Washington, D.C.

Kyle O’Dowd
Associate Executive Director for Policy
National Association of
Criminal Defense Lawyers
Washington, D.C.

Robert Alt
Senior Legal Fellow & Deputy Director
Center for Legal & Judicial Studies
The Heritage Foundation
Washington, D.C.

Shana-Tara Regon
White Collar Crime Policy Director
National Association of
Criminal Defense Lawyers
Washington, D.C.

Brian W. Walsh
Senior Legal Research Fellow
Center for Legal & Judicial Studies
The Heritage Foundation
Washington, D.C.

Tiffany M. Joslyn
White Collar Crime Policy Counsel
National Association of
Criminal Defense Lawyers
Washington, D.C.

April 2010

Table of Contents

About the Organizations  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  viii
Fact Sheet  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Executive Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1
Criminal Punishment Requires Culpability and Fair Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  3
The Proliferation of Criminal Offenses with Inadequate Mens Rea Requirements
Undermines Federal Criminal Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
Rationale and Summary of Methodology  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
	 Rationale for the Study of the Legislative Process  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
	 Summary of Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
Mens Rea Data Analysis, Calculations, and Findings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
	 Mens Rea Category Totals  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  12
	 A Study of Each Mens Rea Category Through Example Offenses  . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
		 Offenses in the None Mens Rea Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
		 Offenses in the Weak Mens Rea Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
		 Offenses in the Moderate Mens Rea Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
		 Offenses in the Strong Mens Rea Category . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
	 The Reliance on Judiciary Committee Oversight  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  19
	 Identifying the Effect of Congressional Actions on Mens Rea Requirements . . . . . . . . . . . . . . . . . . . 20
	 The Regulatory Criminalization Problem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  21
Conclusions on the Legislative Process  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  22
	 Mens Rea Requirements Are Inadequate at Every Step of the Legislative Process  . . . . . . . . . . . . . .  22
The Judiciary Committees Are Frequently Afforded No or Inadequate Opportunities for
Oversight of Criminal Offenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  24

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The Proliferation of Federal Criminal Law Continues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Poor Legislative Draftsmanship Is Commonplace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Congress Regularly and Inappropriately Delegates Criminal Lawmaking Authority . . . . . . . . . . . . 25

Ending the Trend: Federal Criminal Law Reforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
	 Enact Default Mens Rea Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
	 Codify the Common-Law Rule of Lenity  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
	 Require Sequential Referral to the Judiciary Committees  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
	 Require Reporting on All New Federal Criminalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
	 Focus on Clear and Careful Draftsmanship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Methodological Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
	 The Mens Rea Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
		 The Studied Offenses Defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
		 Counting the Studied Offenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
		 Offense Interpretation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
		 Categorizing the Offenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
			 The Four Mens Rea Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
				 Inadequate Mens Rea Requirements: “None” and “Weak” . . . . . . . . . . . . . . . . . . . . . . . 35
				 Adequate Mens Rea Requirements: “Moderate” and “Strong” . . . . . . . . . . . . . . . . . . . . 35
			 Tabulating Intermediate Mens Rea Grades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
		 Congressional Actions  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
	
Statistical Analysis of Possible Correlations Between Congressional Actions and
Protectiveness of Mens Rea Requirements  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Endnotes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Online Appendix – Available at: http://report.heritage.org/sr0077 and www.nacdl.org/withoutintent
	 Offenses Appendix
		 Part One: Studied Offenses Originating in the United States House of Representatives
		 Part Two: Studied Offenses Originating in the United States Senate
	 Correlation Appendix

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

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About the Organizations

Founded in 1973, The Heritage Foundation is a research and educational institution—a think tank—
whose mission is to formulate and promote conservative public policies based on the principles of free enterprise, limited government, individual freedom, traditional American values, and a strong national defense.
We believe the principles and ideas of the American Founding are worth conserving and renewing. As
policy entrepreneurs, we believe the most effective solutions are consistent with those ideas and principles.
Our vision is to build an America where freedom, opportunity, prosperity, and civil society flourish.  
Heritage’s staff pursues this mission by performing timely, accurate research on key policy issues and
effectively marketing these findings to our primary audiences: members of Congress, key congressional
staff members, policymakers in the executive branch, the nation’s news media, and the academic and
policy communities.
Governed by an independent Board of Trustees, The Heritage Foundation is an independent, taxexempt institution. Heritage relies on the private financial support of the general public—individuals, foundations, and corporations—for its income, and accepts no government funds and performs no contract
work. Heritage is one of the nation’s largest public policy research organizations. More than 625,000 individual members make it the most broadly supported think tank in America.
The Heritage Foundation
214 Massachusetts Avenue, NE
Washington, D.C. 20002
(800) 546-2843
heritage.org

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About the Organizations

The National Association of Criminal Defense Lawyers (NACDL) is the preeminent organization
in the United States advancing the goal of the criminal defense bar to ensure justice and due process for
persons charged with a crime or wrongdoing. NACDL’s core mission is to: Ensure justice and due process
for persons accused of crime; Foster the integrity, independence and expertise of the criminal defense profession; and Promote the proper and fair administration of criminal justice.
Founded in 1958, NACDL has a rich history of promoting education and reform through steadfast
support of America’s criminal defense bar, amicus advocacy, and myriad projects designed to safeguard due
process rights and promote a rational and humane criminal justice system. NACDL’s 11,000 direct members—and more than 90 state, local and international affiliates with an additional 40,000 members—include
private criminal defense lawyers, public defenders, active U.S. military defense counsel, and law professors
committed to preserving fairness in America’s criminal justice system. Representing thousands of criminal defense attorneys who know firsthand the inadequacies of the current system, NACDL is recognized
domestically and internationally for its expertise on criminal justice policies and best practices.
National Association of Criminal Defense Lawyers
1660 L Street, NW, 12th Floor
Washington, D.C. 20036
(202) 872-8600
nacdl.org

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

v

Foreword

A core principle of the American system of justice is that individuals should not be subjected
to criminal prosecution and conviction unless they intentionally engage in inherently wrongful
conduct or conduct that they know to be unlawful. Only in such circumstances is a person truly
blameworthy and thus deserving of criminal punishment. This is not just a legal concept; it is the
fundamental anchor of the criminal justice system. The Heritage Foundation and the National
Association of Criminal Defense Lawyers (NACDL) share a common concern that expansive
and ill-considered criminalization has cast the nation’s criminal law enforcement adrift from this
anchor. In the absence of a clearly articulated nexus between a person’s conduct and his mental
culpability, criminal laws subject the innocent to unjust prosecution and punishment for honest
mistakes or actions that they had no reason to know are illegal.
In recent decades, the federal government has increasingly employed criminal statutes to
regulate behavior. Congress has invoked this most awesome power of government—the power to prosecute and imprison—as a regulatory mechanism, something never contemplated by
the nation’s founders. By the end of 2007, the United States Code included over 4,450 federal
crimes; an estimated tens of thousands more are located in the federal regulatory code. But
something fundamental is often lacking from this tidal wave of penal provisions: meaningful
mens rea requirements. Mens rea is a Latin term describing a culpable mental state, without
which there can be no crime. Lamentably, Congress has enacted scores of laws with weak
or no mens rea requirements, the result of a legislative process that is haphazard at best and
arbitrary at worst. In doing so, it has eroded the principle of fair notice beyond recognition
and dangerously impaired the justification for criminal punishment that has for centuries been
based on an individual’s intent to commit a wrongful act. This trend undermines confidence
in government and risks pervasive injustice.
The Heritage Foundation is a research and educational institution whose mission is to formulate and promote conservative public policies based upon the principles of free enterprise,
limited government, individual freedom, traditional American values, and a strong national
defense. NACDL is the preeminent organization in the United States advancing the goals of
the criminal defense bar to ensure justice and due process for persons accused of crime or
wrongdoing and to seek a rational and humane criminal justice system. While Heritage and
NACDL by no means share a common overall agenda, the two organizations are united in the
belief that criminal lawmaking must return to its fundamental roots by requiring true blameworthiness and providing fair notice of potential criminal liability. Penal statutes that do not
provide for a clear and meaningful mens rea requirement are unacceptable. This report is an
effort to demonstrate the depth and breadth of this problem.

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Through an analysis of legislation introduced in the 109th Congress, this report shows
just how far federal criminal lawmaking has drifted from its doctrinal anchor. It establishes
that the legislative process regularly results in the passage of laws that lack adequate mens
rea requirements. Further, it shows that the legislative process itself is flawed and disjointed.
The absence of any uniform or consistent process to calibrate the intent requirements in
penal provisions virtually guarantees the enactment of laws that lack meaningful or consistent
mens rea components. Finally, this report proposes commonsense, workable solutions that can
stem, and possibly reverse, this troubling trend.
Heritage and NACDL are proud to have collaborated on this project. We are confident
that it will heighten awareness concerning a burgeoning problem that transcends political
affiliation or ideology. We are equally confident that fostering that awareness will promote
principled reform.

	
Edwin Meese III	
	 The Heritage Foundation	
		
	

Norman L. Reimer
National Association of
Criminal Defense Lawyers

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

vii

Acknowledgements

This study and report are the results of a collaborative project between the National Association of
Criminal Defense Lawyers (NACDL) and The Heritage Foundation. The authors would like to thank the
Board of Trustees of The Heritage Foundation and the Board of Directors of NACDL, as well as President
Cynthia Hujar Orr and the officers of NACDL, for their support.
Many individuals provided invaluable guidance and oversight for this project, particularly Edwin
Meese, Chairman of Heritage’s Center for Legal & Judicial Studies, and Norman L. Reimer, Executive
Director of NACDL. The success of this project would not have been possible without the dedicated efforts
and insightful analysis provided by Robert Alt, Shana-Tara Regon, and Ivan Dominguez. Todd Gaziano,
Kyle O’Dowd, Jack King, Quintin Chatman, Christopher Norfleet, Levi Swank, and Drew Sarrett provided
invaluable input and assistance at multiple stages of the project, and Stephanie Martz had a key role in the
development of the study’s initial concept. Numerous law clerks and interns from both organizations provided valuable assistance as well.
David Muhlhausen and Heritage’s Center for Data Analysis worked efficiently to develop and conduct
the statistical analyses and conclusions supporting some of this study’s findings. The authors also wish to
acknowledge the hard work provided by the members of the art, creative services, design, marketing, and
editorial departments of both organizations.
Finally, the authors wish to thank Jon May, Jeffrey Parker, Ellen Podgor, Irwin Schwartz, Earl Silbert,
Alixandra Smith, and Andrew Weissmann for reviewing early drafts of the report and offering candid and
helpful feedback.
Despite these acknowledgements, any errors or omissions in the study or report are solely the responsibility of the authors.

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Fact Sheet

Without Intent: How Congress Is Eroding the
Criminal Intent Requirement in Federal Law
•	 A core principle of the American system of justice is that no one should be subjected to criminal
punishment for conduct that he did not know was illegal or otherwise wrongful.
•	 This principle of fair notice, which has been a cornerstone of our criminal justice system since
the nation’s founding, is embodied in the requirement that, with rare exceptions, the government must prove the defendant acted with mens rea—a “guilty mind”—before subjecting him to
criminal punishment.
•	 Members of the 109th Congress (2005–2006) proposed 446 criminal offenses that did not involve
violence, firearms, drugs and drug trafficking, pornography, or immigration violations.
•	 Of these 446 proposed non-violent criminal offenses, 57 percent lacked an adequate mens rea
requirement. Worse, during the 109th Congress, 23 new criminal offenses that lack an adequate
mens rea requirement were enacted into law.
•	 Congress’s expertise for crafting criminal offenses resides in the House and Senate Judiciary
Committees. Only these committees have express jurisdiction over federal criminal law, yet of
the 446 criminal offenses studied, over one-half were not sent to the House or Senate Judiciary
Committees for review and deliberation.
•	 By consistently neglecting the special expertise of the two judiciary committees when drafting
criminal offenses, Congress is endangering civil liberties.
•	 Without reforms like those recommended in this report, innocent individuals are at risk of unjust conviction under federal criminal offenses that have inadequate mens rea requirements.

Recommendations
Congress should:
•	 Enact default rules of interpretation ensuring that guilty-mind requirements are adequate to
protect against unjust conviction.
•	 Codify the rule of lenity, which grants defendants the benefit of the doubt when Congress fails
to legislate clearly.
•	 Require adequate judiciary committee oversight of every bill proposing criminal offenses
or penalties.
•	 Provide detailed written justification for and analysis of all new federal criminalization.
•	 Redouble efforts to draft every federal criminal offense clearly and precisely.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

ix

Executive Summary

For centuries, “guilty mind,” or mens rea, requirements restricted criminal punishment to those who
were truly blameworthy and gave individuals fair notice of the law. No person should be convicted of a
crime without the government having proved that he acted with a guilty mind—that is, that he intended
to violate a law or knew that his conduct was unlawful or sufficiently wrongful so as to put him on notice
of possible criminal liability. In a sharp break with this tradition, the recent proliferation of federal criminal
laws has produced scores of criminal offenses that lack adequate mens rea requirements and are vague in
defining the conduct that they criminalize.
The National Association of Criminal Defense Lawyers and The Heritage Foundation jointly undertook an unprecedented look at the federal legislative process for all studied non-violent criminal offenses
introduced in the 109th Congress in 2005 and 2006. This study revealed that offenses with inadequate
mens rea requirements are ubiquitous at all stages of the legislative process: Over 57 percent of the offenses introduced, and 64 percent of those enacted into law, contained inadequate mens rea requirements,
putting the innocent at risk of criminal punishment. Compounding the problem, this study also found
consistently poor legislative drafting and broad delegation of Congress’s authority to make criminal law
to unaccountable regulators.
According to several scholars and legal researchers, Congress is criminalizing everyday conduct at
a reckless pace. This study provides further evidence in support of that finding. Members of the 109th
Congress proposed 446 non-violent criminal offenses and Congress enacted 36 of them. These totals do
not include the many offenses concerning firearms, possession or trafficking of drugs or pornography,
immigration violations, or intentional violence. The sheer number of criminal offenses proposed demonstrates why so many of them were poorly drafted and never subjected to adequate deliberation and
oversight.
Even more troubling is the study’s finding that many of the criminal offenses Congress is enacting
are fundamentally flawed. Not only do a majority of enacted offenses fail to protect the innocent with
adequate mens rea requirements, many of them are so vague, far-reaching, and imprecise that few lawyers,
much less non-lawyers, could determine what specific conduct they prohibit and punish.
These failings appear to be related to the reckless pace of criminalization. Congress is awash with criminal legislation, and the House and Senate Judiciary Committees lack the time and opportunity to review
each criminal offense and correct weak mens rea requirements. Over half (52 percent) of the offenses in the
study were never referred to either judiciary committee. This is despite these committees’ special expertise
in crafting criminal offenses, knowledge of the priorities and resources of federal law enforcement, and
express jurisdiction over federal criminal law.
One encouraging finding is that oversight by the House Judiciary Committee does improve the quality of mens rea requirements. Oversight includes marking up a bill or reporting it out of committee for

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consideration by the full House of Representatives. Based upon this analysis, and upon the specific criminal
law jurisdiction and expertise of the House and Senate Judiciary Committees, automatic referral of all bills
adding or modifying criminal offenses to these two committees is likely to improve mens rea requirements.
More importantly, automatic referral could stem the tide of criminalization by forcing Congress to adopt
a measured and prioritized approach to criminal lawmaking. By neglecting the expertise of the judiciary
committees, Congress endangers civil liberties.
The study also revealed that Congress frequently delegates its criminal lawmaking authority to other
bodies, typically executive branch agencies. Delegation empowers unelected regulators to decide what
conduct will be punished criminally, rather than requiring Congress to make that determination itself. This
“regulatory criminalization” significantly increases the scope and complexity of federal criminal law, prevents systematic congressional oversight of the criminal law, and lacks the public accountability provided
by the normal legislative process.
To begin to solve the problems identified in the study, this report offers five specific recommendations
for reform. Congress should:

1. Enact default rules of interpretation to ensure that mens rea requirements are adequate to
protect against unjust conviction.
Congress should enact statutory law that directs federal courts to grant a criminal defendant the benefit of the doubt when Congress has failed to adequately and clearly define the mens rea requirements for
criminal offenses and penalties. First, this reform would address the unintentional omission of mens rea
terminology by directing federal courts to read a protective, default mens rea requirement into any criminal
offense that lacks one. Second, it would direct courts to apply any introductory or blanket mens rea terms
in a criminal offense to each element of the offense. In this way, it would improve the mens rea protections
throughout federal criminal law, provide needed clarity, force Congress to give careful consideration to
mens rea requirements when adding or modifying criminal offenses, and help ensure that fewer individuals
are unjustly prosecuted and punished.

2. Codify the common-law rule of lenity, which grants defendants the benefit of doubt when
Congress fails to legislate clearly.
The rule of lenity directs a court, when construing an ambiguous criminal law, to resolve the ambiguity
in favor of the defendant. In a recent U.S. Supreme Court decision, United States v. Santos, Justice Antonin
Scalia explained that this “venerable rule vindicates the fundamental principle that no citizen should be
held accountable for a violation of a statute whose commands are uncertain, or subjected to punishment
that is not clearly prescribed.” Giving the benefit of the doubt to the defendant is consistent with the
traditional rules that all defendants are presumed innocent and that the government bears the burden of

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

xi

proving every element of a crime beyond a reasonable doubt. Codifying this venerable common-law rule
would serve the rights of all defendants at every stage of the criminal process. This reform would also
protect Congress’s lawmaking authority because it would restrict the ability of federal courts to legislate
from the bench and reduce the frequency with which those courts must speak because Congress has failed
to legislate clearly.

3. Require judiciary committee oversight of every bill that includes criminal offenses or
penalties.
Congressional rules should require every bill that would add or modify criminal offenses or penalties
to be subject to automatic referral to the relevant judiciary committee. A “sequential” referral requirement
would give the House or Senate Judiciary Committee exclusive control over a bill until it reports the bill
out or the time limit for its consideration expires, and only at that point could the bill move to another
committee. The judiciary committees have special expertise in crafting criminal offenses, knowledge of
the priorities and resources of federal law enforcement, and express jurisdiction over federal criminal law.
While automatic referral may not produce stronger, more protective mens rea requirements, it should result
in clearer, more specific, and higher quality criminal offenses. More importantly, this rule could help stem
the tide of criminalization by forcing Congress to adopt a measured and prioritized approach to criminal
lawmaking. Further, it would increase congressional accountability for new criminalization and ultimately
reduce overcriminalization.

4. Require detailed written justification for and analysis of all new federal criminalization.
This reform would require the federal government to produce a standard public report assessing the
purported justification, costs, and benefits of all new criminalization. This report must include:
•	 A description of the problem that the criminal offense or penalty is intended to redress, including an account of the perceived gaps in existing law, the wrongful conduct that is currently
unpunished or under-punished, and any specific cases or concerns motivating the legislation;
•	 A direct statement of the express constitutional authority under which the federal government
purports to act;
•	 An analysis of whether the criminal offenses or penalties are consistent with constitutional and
prudential considerations of federalism;
•	 A discussion of any overlap between the conduct to be criminalized and conduct already criminalized by existing federal and state law;
•	 A comparison of the new law’s penalties with the penalties under existing federal and state laws
for comparable conduct;
•	 A summary of the impact on the federal budget and federal resources, including the judiciary,
of enforcing the new offense and penalties to the degree required to solve the problem that the
new criminalization purports to address;
•	 A review of the resources that federal public defenders have available and need in order to
adequately defend indigent defendants charged under the new law; and

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•	 An explanation of how the mens rea requirement of each criminal offense should be interpreted
and applied to each element of the offense.
This reform would also require Congress to collect information on regulatory criminalization, including an enumeration of all new criminal offenses and penalties that federal agencies have added to federal
regulations, as well as the specific statutory authority supporting these regulations.
Mandatory reporting would increase accountability by requiring the federal government to perform
basic analysis of the grounds and justification for all new and modified criminal offenses and penalties.

5. Draft every criminal offense with clarity and precision.
One overarching reform recommendation is a slower, more focused, and deliberative approach to
the creation and modification of federal criminal offenses. When drafting criminal offenses, Members of
Congress should always:
•	 Include an adequate mens rea requirement;
•	 Define both the actus reus (guilty act) and the mens rea (guilty mind) of the offense in specific and
unambiguous terms;
•	 Provide a clear statement of whether the mens rea requirement applies to all the elements of the
offense or, if not, which mens rea terms apply to which elements of the offense; and
•	 Avoid delegating criminal lawmaking authority to regulators.
The importance of sound legislative drafting cannot be overstated, for it is the drafting of a criminal
offense that frequently determines whether a person acting without intent to violate the law and lacking
knowledge that his conduct was unlawful or sufficiently wrongful to put him on notice of possible criminal
liability will endure a life-altering prosecution and conviction—and lose his freedom.
It is equally important that Members of Congress resist the temptation to bypass the arduous task of
drafting criminal legislation by delegating it to unelected regulators. It is the legislative branch’s responsibility to ensure that no individual is punished if Congress itself did not devote the time and resources necessary to clearly and precisely articulate the law giving rise to that punishment.
These five reforms would help ensure that every proposed criminal offense receives the attention due
whenever Congress determines how to focus the greatest power government routinely uses against its own
citizens: the criminal law. Coupled with increased public awareness and scrutiny of the criminal offenses
Congress enacts, these reforms would strengthen the protections against unjust conviction and prevent
the dangerous proliferation of federal criminal law. With their most basic liberties at stake, Americans are
entitled to no less.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

xiii

2

WITHOUT INTENT

Without Intent
How Congress Is Eroding the
Criminal Intent Requirement in Federal Law

F

ew protections against unjust criminal conviction and punishment are as essential as
ensuring that every criminal offense includes
a meaningful mens rea, or “guilty mind,” requirement.1 With rare exception, no person should be
convicted of a crime without the government having proved that he acted with a guilty mind—that
is, that he intended to violate a law or knew that his
conduct was unlawful or sufficiently wrongful so as
to put him on notice of possible criminal liability.
Absent a meaningful mens rea requirement, a defendant’s other legal and constitutional rights cannot
protect him from unjust punishment for making
honest mistakes or engaging in conduct that he had
no reason to know was illegal.
For crimes involving inherently wrongful conduct—such as murder, arson, rape, theft, and robbery—the law properly allows the inference of a
guilty mind if the government proves that the conduct was committed voluntarily. With such crimes,
the law properly assumes that inherent wrongfulness forecloses the possibility of punishing individuals who are not truly culpable.
Many criminal offenses, however, lack that
kind of protection. Hundreds of federal statutory
offenses, and an estimated tens of thousands of
federal regulatory offenses, criminalize conduct
that is not inherently wrongful. Rather, such conduct is wrongful only because it is prohibited by
law, or malum prohibitum. Malum prohibitum offenses cover a broad range of conduct, such as failure

to comply with specific regulatory or reporting
requirements. Unlike with crimes involving inherently wrongful conduct, the conduct itself usually
does not justify the inference that a criminal defendant knew that his acts were prohibited, that
he intended to violate the law, or that he had any
knowledge that his conduct was wrongful in any

With rare exception, no person should be convicted of
a crime without the government having proved that he
acted with a guilty mind—that is, that he intended to
violate a law or knew that his conduct was unlawful
or sufficiently wrongful so as to put him on notice of
possible criminal liability.
way. Therefore, to ensure that only persons who
are truly culpable can be convicted and punished,
the definitions of malum prohibitum offenses must
include protective mens rea requirements. Unfortunately, many of the thousands of malum prohibitum offenses in federal law do not.
This report presents the results of a study of
legislation containing criminal offenses introduced
in a recent Congress. The study asked whether
Members of Congress included meaningful mens
rea requirements in the scores of non-violent and
non-drug criminal offenses2 (hereinafter “non-violent offenses”) that Congress considered. Its results
are striking: Over 57 percent of the offenses considered by the 109th Congress contained inadequate

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

1

mens rea requirements, putting the innocent at risk
of criminal punishment.3 Compounding the problem, this study also found consistently poor legislative drafting and broad delegation of Congress’s
authority to make criminal laws to unelected officials in administrative agencies—that is, criminalization by regulation.

The study asked whether Members of Congress included
meaningful mens rea requirements in the scores of
non-violent and non-drug criminal offenses that Congress
considered. Its results are striking: Over 57 percent of
the offenses considered by the 109th Congress contained
inadequate mens rea requirements, putting the innocent
at risk of criminal punishment.
The study identified three main causes of
Congress’s failure to include meaningful mens rea
requirements in criminal offenses. First, there is the
fragmented and disjointed process for creating and
modifying criminal offenses. Despite the House
and Senate Judiciary Committees’ expertise and
subject-matter jurisdiction, over half (52 percent)
of the offenses in the study were not referred to
either committee for oversight.
Second is the flood of proposed criminal offenses. Crafting offenses that properly channel government’s power to impose criminal punishment
demands substantial debate and deliberation. Yet
in the 109th Congress, so many bills (203) were
proposed containing so many non-violent offenses
(446) that it is unreasonable to expect that any substantial proportion of these offenses could have received adequate legislative oversight and scrutiny.
These numbers would rise even higher if they included the enormous number of bills containing
criminal offenses that concern firearms, possession
or trafficking of drugs or pornography, immigration violations, and intentional violence. The sheer
number of criminal offenses proposed demonstrates

2

why so many of them were poorly drafted and
were never the subject of adequate deliberation
and oversight.
Third, Congress’s choice to delegate its criminal lawmaking authority to executive agencies has
grown more common. This study identified at least
63 offenses that, if enacted, would hand over this
authority to unelected agency officials. That constitutes 14 percent of the offenses included in the
study. The study’s totals and percentages do not
account for the many additional criminal offenses
that federal agencies would be authorized to create
in this manner.
One encouraging finding is that oversight by
the House Judiciary Committee does improve
the quality of mens rea requirements. Oversight
includes the committee marking up a bill or reporting it out of committee for consideration by
the full House of Representatives. Based upon
this analysis, and upon the specific criminal law
jurisdiction and expertise of the House and Senate Judiciary Committees, automatic sequential
referral4 of all bills adding or modifying criminal
offenses to these two committees is likely to improve mens rea requirements.
The number of new criminal offenses proposed and enacted in the 109th Congress was by
no means exceptional.5 The recent proliferation of
federal criminal law has produced scores of criminal offenses that lack adequate mens rea requirements and are vague in defining the conduct that
they criminalize. The study reported here supports
the conclusion of a growing number of commentators and experts that the time has come for Congress to stop this dangerous trend, to acknowledge
the threat represented to individual and business
civil liberties by this unprincipled form of criminalization, and to carry out critical reforms to federal criminal law that will protect individuals and
businesses from the risk of unjust prosecution and
conviction.

WITHOUT INTENT

I. Criminal Punishment Requires Culpability and Fair Notice
The greatest power that any civilized government routinely uses against its own citizens is the
power to prosecute and punish under criminal law.
As Columbia law professor Herbert Wechsler famously put it, criminal law “governs the strongest
force that we permit official agencies to bring to bear
on individuals.”6 This necessarily distinguishes the
criminal law from all other areas of law and makes
it uniquely susceptible to abuse and injustice. More
than any other area of law, the criminal law, in its
prohibitions and commands, as well as its power to
punish, must be firmly grounded in fundamental
principles of justice. Such principles are expressed
in both substantive and procedural protections.
One fundamental principle is embodied in the
doctrine of fair notice. The fair notice doctrine requires that, in order for a person to be punished
criminally, the offense with which she is charged
must provide adequate notice that the conduct in
which she engaged was prohibited. The Supreme
Court has recognized that fair notice is a component of the Constitution’s due process protections.
For example, in the course of reversing the convictions of civil rights protestors because the law under which they were convicted was “void for vagueness” (a species of the fair notice doctrine), the
Supreme Court stated: “No one may be required
at peril of life, liberty or property to speculate as
to the meaning of penal statutes. All are entitled
to be informed as to what the State commands or
forbids.”7 It is thus a fundamental principle of due
process that “a criminal law must give fair warning
of the conduct it makes a crime.”8
Related to fair notice is the principle that the
government must prove both “an evil-meaning
mind” and “an evil-doing hand” before criminal
punishment may justly be imposed.9 This dual
requirement is typically referred to by the Latin
terms mens rea and actus reus, which translate to
“guilty mind” and “guilty act.” Whereas the actus
reus is generally objective and physical in nature,
the mens rea is generally subjective and psychological.10 Both are necessary in order to impose criminal punishment; neither alone is sufficient. The

mens rea requirement has been a part of AngloAmerican law for over six centuries,11 and requiring the government to prove that a defendant had
a guilty mind at the time she committed a guilty
act “is the rule of, rather than the exception to,
the principles of Anglo-American criminal jurisprudence.”12 The Supreme Court has described
this principle as being “as universal and persistent
in mature systems of law as belief in freedom of
the human will and a consequent ability and duty
of the normal individual to choose between good
and evil.”13 Because the federal criminal justice
system does not permit courts to define criminal
offenses under common law, defining the conduct
and mental state constituting a federal crime is the
responsibility of Congress.14
The traditional distinction between malum in se
conduct and malum prohibitum conduct is essential
to a clear understanding of the modern role of mens
rea requirements. Conduct that is inherently evil or
wrongful is malum in se, or “evil in itself.” Historically, malum in se offenses comprised the bulk of all
criminal offenses, such as murder, arson, theft, robbery, and rape. By their very nature, these acts are

The fair notice doctrine requires that, in order for a
person to be punished criminally, the offense with which
she is charged must provide adequate notice that the
conduct in which she engaged was prohibited.
wrongful, independent of their status under law.
Therefore, fair notice of illegality can reasonably
be imputed to the average person. Clearly, no person who kills another intentionally, rather than by
accident or inadvertence, should be able to claim
ignorance of the law as a defense. With few exceptions, the average person can be presumed to know
that inherently wrongful acts are also unlawful.
Conversely, malum prohibitum conduct is not
inherently evil or necessarily wrongful, but rather
“prohibited evil.” Malum prohibitum offenses include jaywalking, fishing without a permit, or

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

3

shipping products safely but in a manner inconsistent with federal or state regulations. Although
there may be legitimate reasons for prohibiting
such conduct, the acts themselves, independent of
the prohibition, are not inherently wrongful.15
Historically, it was presumed that the law, and
especially the criminal law, was “definite and knowable,”16 even by the average person. Ignorance of
the law was therefore no defense to criminal punishment. The small number of criminal offenses,
and the fact that the majority of offenses criminalized malum in se conduct, made this presumption
both reasonable and just.

With over 4,450 federal statutory crimes and an
estimated tens of thousands more in federal regulations,
neither criminal law professors nor lawyers who
specialize in criminal law can know all of the conduct
that is criminalized. Ordinary individuals are at an
even greater disadvantage.
With the enormous growth in malum prohibitum offenses, however, this presumption has become a trap for the unwary. As criminal law professor Joshua Dressler has stated:
Whatever its plausibility centuries ago, the
“definite and knowable” claim cannot withstand modern analysis. There has been a
“profusion of legislation making otherwise
lawful conduct criminal (malum prohibitum).”
Therefore, even a person with a clear moral compass is frequently unable to determine accurately
whether particular conduct is prohibited. Furthermore, many modern criminal statutes
are exceedingly intricate. In today’s complex
society, therefore, a person can reasonably be
mistaken about the law.17

Indeed, with over 4,450 federal statutory crimes
and an estimated tens of thousands more in federal
regulations,18 neither criminal law professors nor
lawyers who specialize in criminal law can know all
of the conduct that is criminalized. Ordinary individuals are at an even greater disadvantage.

4

Accordingly, one of the critical functions served
by an adequate mens rea requirement is to protect
those who are reasonably mistaken about or unaware of the law. As one travels along the continuum from pure malum in se conduct, such as murder,
towards entirely malum prohibitum conduct, such as
fishing without a permit, the fair notice provided
by the conduct itself diminishes to the point of vanishing. It is an obvious injustice to punish an individual for conduct that is not inherently wrongful
if she did not know, and had no reasonable prospect
of knowing, that her conduct was prohibited by
law. This is why the principle that finding a person
criminally responsible requires a mens rea, or guilty
mind, and not just an actus reus, or guilty act, is
essential to a just system of criminal law. When
the actus reus is one that is malum prohibitum, fair
notice is diminished or eliminated, and the burden
to compensate for that deficiency falls squarely
upon the mens rea requirement.
When society, through its elected representatives, specifies the particular conduct and mental
state that constitute a crime, “it makes a critical
moral judgment about the wrongfulness of such
conduct, the resulting harm caused or threatened
to others, and the culpability of the perpetrators.”19 Therefore, a proper and adequate mens rea
requirement should reflect the differences in culpability that result when individuals with different
mental states engage in the same prohibited conduct. This point is well illustrated by the differing
mens rea requirements that apply to homicide, or
the killing of a human being. Even with the same
bad act—a killing—different levels of mens rea define different offenses, which carry different punishments. Thus, in federal law, manslaughter is the
unlawful killing of a human being “without malice” and carries a maximum sentence of 15 years
in prison.20 Murder in the second degree requires
“malice aforethought”21 and carries a maximum
sentence of life imprisonment.22 Murder in the
first degree requires both “malice aforethought”
and that the killing be “willful, deliberate, malicious, and premeditated”; it carries a maximum
sentence of death.23 Mens rea requirements such
as these not only help to assign appropriate levels of punishment, but also to protect from unjust

WITHOUT INTENT

Homicide Offense

Mens Rea Requirement

Maximum Penalty

Murder in the first degree (18 U.S.C. § 1111(a))

“malice aforethought” and “willful,
deliberate, malicious, and premeditated”

Death

Murder in the second degree (18 U.S.C. § 1111(a))

“malice aforethought”

Life imprisonment

Manslaughter (18 U.S.C. § 1112)

“without malice”

15 years

criminal punishment those who committed prohibited conduct accidentally or inadvertently.
Homicide presents a relatively straightforward
example because the killing of a human being is so
grievous an act. Lesser wrongs may require even
more attention to the mens rea requirements associated with them. The wrongful conduct at the heart
of many malum prohibitum offenses is falsehood or
deceit. Such conduct generally carries with it some
degree of culpability, but not everything that is a
“sin” is necessarily punishable as a crime.24 If all
“immoral” behavior were subject to criminal punishment, the only things protecting any individual
from criminal conviction and punishment would
be chance and the whims of prosecutors. A criminal offense should require more than a mere act of
falsehood to ensure that only those who act with
the degree of culpability meriting criminal punishment can be convicted.
As the Supreme Court has recognized, “All are
entitled to be informed as to what the State commands or forbids.”25 By its own terms, a criminal
offense should prevent conviction of an individual

acting without intent to violate the law and lacking knowledge that her conduct was unlawful or
sufficiently wrongful so as to put her on notice of
possible criminal liability. A person who acts without such intent and knowledge does not deserve
government’s greatest punishment or the extreme
moral and societal censure such punishment carries. Especially today, when the number of malum

Mens rea requirements not only help to assign
appropriate levels of punishment, but also to protect
from unjust criminal punishment those who committed
prohibited conduct accidentally or inadvertently.
prohibitum offenses in federal law has surged, careful consideration must be given to the fundamental principles of culpability and fair notice when
defining the mens rea and actus reus that constitute
a federal crime. In the federal system, this critical
responsibility falls on the shoulders of Congress,
which must therefore engage in careful drafting,
deliberation, and debate before creating or modifying federal criminal offenses.

II. The Proliferation of Criminal Offenses with Inadequate
Mens Rea Requirements Undermines Federal Criminal Law
Congress routinely creates and amends federal
criminal offenses. Federal statutes alone include over
4,450 criminal offenses, a number that does not take
into account the thousands of criminal offenses dispersed throughout federal regulations.26 The almost
inevitable response to any newsworthy problem is
the introduction of federal legislation containing

new criminal provisions or increased criminal penalties.27 This knee-jerk tendency, and the resulting
over-federalization of criminal law, is frequently
a product of political considerations.28 As a result,
practitioners, academics, and even the Department
of Justice itself have struggled to document the actual number of federal statutory offenses.29

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

5

The sheer size of the federal criminal law is so
great that no one has even been able to find and provide a definitive count of the thousands of statutory
criminal offenses in federal law. Several researchers, however, have made estimates of the number
of criminal offenses in federal statutes and reached
general conclusions about the nature of those offenses. In 1998, the American Bar Association’s Task

The sheer size of the federal criminal law is so great
that no one has even been able to find and provide a
definitive count of the thousands of statutory criminal
offenses in federal law.
Force on the Federalization of Crime published a
report finding that federal criminalization had proceeded at a rapid pace since the Department of Justice had estimated, over 10 years earlier, that there
were more than 3,000 crimes in the U.S. Code.30 It
found that, of the federal criminal provisions passed
into law during the 132-year period from the end of
the Civil War to 1996, fully 40 percent were enacted
in the 26 years from 1970 to 1996.31 The ABA Task
Force explained, however, that
an exact count of the present “number” of
federal crimes contained in the statutes (let
alone those contained in administrative regulations) is difficult to achieve and the count
[is] subject to varying interpretations. In part,
the reason is not only that the criminal provisions are now so numerous and their location
in the books so scattered, but also that federal criminal statutes are often complex. One
statutory section can comprehend a variety of
actions, potentially multiplying the number
of federal “crimes” that could be enumerated. (For example, the language of 18 U.S.C.
§ 2113 encompasses bank robbery, extortion,
theft, assaults, killing hostages, and storing or
selling anything of value knowing it to have
been taken from a bank, etc.) Depending on
how all this subdivisible and dispersed law is
counted, the true number of federal crimes
multiplies.32

Further complicating an accurate count, the
ABA Task Force said, are the “large number of

6

sanctions…dispersed throughout the thousands of
administrative ‘regulations’ promulgated by various
governmental agencies under congressional statutory authorization. Nearly 10,000 regulations mention some sort of sanction, many clearly criminal in
nature, while many others are designated ‘civil.’”33
Demonstrating the diffused and confusing nature
of federal criminal law, a “handful of regulations
purport to criminalize conduct without connecting
the prohibition to a congressional statute.”34
Ten years after the ABA Task Force report, a
study by Professor John S. Baker estimated that the
United States Code included at least 4,450 federal
crimes at the end of 2007.35 Of these, 452 had been
added in the eight years from 2000 through 2007,
an average rate of 56.5 new crimes per year. This
rate, observed Baker, is
roughly the same rate at which Congress created new crimes in the 1980s and 1990s…. So
for the past twenty-five years, a period over
which the growth of the federal criminal law
has come under increasing scrutiny, Congress has been creating over 500 new crimes
per decade.36

The rate at which Congress creates criminal offenses
increases during election years, Baker found.37 Although Baker’s study acknowledges the same difficulties cited by the ABA Task Force in obtaining an
accurate count, the data demonstrate that, from 2000
through 2007, Congress created, on average, one
new crime a week for every week of every year.38
Beyond the rate at which new criminal offenses
are being enacted, three additional concerns quickly emerge when studying the legislative process for
criminal offenses:
1)	 Lack of attention paid to and erosion of
mens rea requirements;
2)	 Poor legislative drafting; and
3)	 Delegation of criminal lawmaking authority through regulatory criminalization.
All three of these practices contribute to the problems of overbroad criminal liability and the lack of
fair notice that the law is supposed to provide.

WITHOUT INTENT

The first, the erosion of mens rea requirements,
has serious implications. As previously discussed, it
is a fundamental principle of criminal law that, before criminal punishment can be imposed, the government must prove both a guilty act (actus reus) and
a guilty mind (mens rea). Despite this rule, omission
of mens rea requirements has become commonplace in federal criminal statutes. Where Congress
does include a mens rea requirement, it is often so
weak that it does not protect defendants from punishment for making honest mistakes or engaging
in conduct that was not sufficiently wrongful to
give notice of possible criminal responsibility. The
resulting criminal offenses fail to satisfy the necessary and well-established principle that criminal liability rests upon an “evil-meaning mind” and an
“evil-doing hand.”39
If the erosion of mens rea requirements in federal criminal statutes were not sufficiently problematic in its own right, its harms are compounded
by poor legislative draftsmanship and regulatory
criminalization. A mens rea requirement cannot
serve its purpose when its meaning or application
is not clear on the face of the statute. Worse, malum
prohibitum offenses, which constitute many of the
criminal offenses in the federal code and almost all
offenses created through regulation, often contain
weak mens rea requirements or none at all. Absent
a meaningful mens rea requirement, the principle
of fair notice is lost when criminal punishment
is imposed for conduct that does not conform to
what reason or experience would suggest may be
illegal.40
Second, federal criminal offenses are frequently
drafted without the clarity and specificity that have
traditionally been required for the imposition of
criminal liability. As the ABA Task Force found, federal criminal statutes often prohibit such exceedingly broad ranges of conduct, in language that is
vague and imprecise, that few lawyers, much less
non-lawyers, could determine what specific conduct they prohibit and punish. And even when the
actus reus is described with clarity, the mens rea requirement may be imprecise. A common result of
poor legislative drafting is uncertainty as to whether a mens rea term in a criminal offense applies to all

of the elements of the offense or, if not, to which
elements it does apply.
Consider, for example, 18 U.S.C. § 1346, commonly referred to as the “honest services fraud”
statute, which defines the term “scheme or artifice to defraud” to include “a scheme or artifice to
deprive another of the intangible right of honest
services.” This definition applies to all the forms of
fraud proscribed by Chapter 63 of the United States
Code, including mail and wire fraud. The honest
services fraud statute, if inserted into the definition
of federal wire fraud, results in the following criminal offense:
Whoever, having devised or intending to devise any scheme or artifice [to deprive another
of the intangible right of honest services]…,
transmits or causes to be transmitted by
means of wire, radio, or television communication interstate or foreign commerce, any
writings, signs, signals, pictures, or sounds for
the purpose of executing such scheme or artifice, shall be fined under this title or imprisoned not more than 20 years, or both.41

Many legal experts have criticized this resulting offense as being vague and overbroad. It fails
to define or limit the phrase “intangible right of
honest services,” and more than 20 years after
the statute’s enactment, the federal courts of

A common result of poor legislative drafting is
uncertainty as to whether a mens rea term in a
criminal offense applies to all of the elements of the
offense or, if not, to which elements it does apply.
appeals are hopelessly divided on how to interpret
this phrase. The only hope for resolution comes
from the Supreme Court’s recent decision to hear
three cases challenging charges brought and convictions obtained under the honest services fraud
statute.42
One example of poor draftsmanship found during this study is an offense in S. 2509, the National Insurance Act of 2006. Section 1713(b) of this

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

7

legislation would create several new criminal offenses relating to “insurance fraud.” One of these
offenses reads:
Any insurance person who is engaged in the
business of insurance who knowingly and intentionally permits the participation described
in paragraph (1) shall be fined as provided in
this title or imprisoned not more than 5 years,
or both.43

The referenced paragraph, in turn, states:
[A]ny individual who has been convicted of
any criminal felony involving dishonesty or
breach of trust, and who participates in the
business of insurance shall be fined…or imprisoned not more than 5 years, or both.44

The phrase “business of insurance” is given a
broad definition by existing law.45 The term “participate,” however, is not defined by statute and
could be read to include the work or involvement
of employees who have incidental contact with the
“business of insurance.” The phrase “dishonesty or
breach of trust” is also undefined and potentially
very broad. From the text of this offense, it seems
likely that an insurance agent who hires either a

Remarkably, it is only after years of litigation and the
opinions of three different courts, including the highest
court in the land, that individuals, lawyers, and
judges finally have a clear determination of what the
government is required to prove in order to impose
criminal liability under this one-sentence criminal
provision.
messenger to deliver insurance documents to a
client or a surveyor who assists in evaluating real
property would be at risk of criminal punishment
if the messenger or surveyor had been convicted of
a felony for lying under oath in a domestic matter
20 years earlier. No one, however, could say for sure
with any degree of certainty, and even venturing an
opinion would, at a minimum, require significant
research and analysis by a lawyer. Under the plain

8

text of the offense, it appears that the insurer need
not have knowledge of this prohibition—much less
understand it—in order to be convicted and punished for violating it.
In a recent case, Flores-Figueroa v. United States,
the Supreme Court considered the difficulties of
interpretation caused by a poorly drafted mens
rea requirement in the federal aggravated identity theft statute.46 The contested offense provides
an additional two years of imprisonment for any
individual who, in the course of or in relation to
certain other felonies, “knowingly transfers, possesses, or uses, without lawful authority, a means
of identification of another person.”47 The offense’s
title, “Aggravated identity theft,” indicates that it is
targeted at theft, which the law typically defines as
an act by which a person obtains property belonging to another with intent to deprive the owner of the
value of the property and to appropriate it to his
own use. The defendant in this case admitted that
he intended to obtain identification numbers that
were phony, and pled guilty to crimes related to
that intent, but he asserted that he had no knowledge that the numbers on the identification cards
actually belonged to another person. The government never contested that point. Instead, it argued
that it need not prove “that the defendant knew that
the ‘means of identification’ he or she unlawfully
transferred, possessed, or used, in fact, belonged to
‘another person.’”48
The Supreme Court rejected that argument,
holding that the statute requires the government
“to show that the defendant knew that the means
of identification at issue belonged to another person.”49 The Court reached this conclusion based on
its view of the basic rules of grammar and the most
natural meaning of the statute’s plain language.50
Citing Justice Alito’s concurring opinion, the
majority acknowledged, however, that “the inquiry
into a sentence’s meaning is a contextual one.”51
Justice Alito’s opinion explained that when interpreting a criminal statute such as this, “it is fair to
begin with a general presumption that the specified
mens rea applies to all the elements of an offense,
but it must be recognized that there are instances in
which context may well rebut that presumption.”52

WITHOUT INTENT

In support of this point, he cited two examples in
which the contextual features of particular statutes
suggest that the defendant need not know particular
elements of the crimes.53 Conversely, Justice Alito
observed that “the Government has not pointed to
contextual features that warrant interpreting [the
aggravated identity theft statute] in a similar way.”54
The majority agreed.55 Remarkably, it is only after
years of litigation and the opinions of three different courts, including the highest court in the land,
that individuals, lawyers, and judges finally have a
clear determination of what the government is required to prove in order to impose criminal liability
under this one-sentence criminal provision.
The third problem, regulatory criminalization,
occurs when Congress delegates its legislative authority to define criminal offenses to another body,
typically an executive branch agency. Delegation
empowers the unelected officials who direct that
agency, such as the Department of the Treasury
or the Environmental Protection Agency, to decide
what conduct will be punished criminally, rather
than requiring Congress to make that determination itself. In this way, the executive branch of the
federal government plays a substantial role in causing overcriminalization, far beyond the President’s
constitutional authority to veto or sign legislation.
In the usual case of regulatory criminalization,
Congress delegates its criminal lawmaking authority by passing a statute that establishes a criminal
penalty for the violation of any regulation, rule, or
order promulgated by the agency or an official acting on behalf of that agency. Some of these provisions include mens rea terminology; for example,
criminal responsibility might extend to “anyone
who knowingly violates any regulation.”56 However, statutes authorizing regulatory criminalization
often fail to include any mens rea terminology, and
nothing guarantees that the resulting criminal regulations will themselves include a mens rea requirement, let alone adequate ones.
Beyond the constitutional concerns inherent
in this delegation of criminal lawmaking authority, the actual practice of regulatory criminalization
significantly increases the scope and the complexity

of federal criminal law. In addition to the thousands
of criminal offenses spread through the 49 titles of
the United States Code, according to estimates tens
of thousands of criminal offenses are similarly scattered throughout the over 200 volumes of federal
regulations.57 These regulations almost always proscribe conduct that is, at least in part, malum prohibitum. As a result, vast expanses of conduct are
criminalized without any systematic congressional
oversight and without providing any form of notice
to the ordinary person that his everyday activities
may be subject to criminal punishment.

Congress delegates its criminal lawmaking authority by
passing a statute that establishes a criminal penalty for
the violation of any regulation, rule, or order promulgated
by an agency or an official acting on behalf of an agency.
The practice of regulatory criminalization compounds the problems created by unclear, imprecise
legislative drafting. Some or all of the elements
of a particular criminal offense may be codified in
regulations far removed from the actual statute that
contains the mens rea requirement. Further, the elements that make up the complete offense can be
spread across numerous regulations. For example,
section 506(g)(2) of H.R. 3968 would impose a criminal penalty on any person “who knowingly…violates any other environmental protection requirement set forth in title III or any regulation issued by
the Secretaries to implement this Act, any provision
of a permit issued under this Act (including any exploration or operations plan on which such permit
is based), or any condition or limitation thereof.”58
While the mens rea requirement, “knowingly,” is
located in the statutory provision, all of the prohibited conduct would be defined in any number of
regulations and even individual permits issued as
part of the regulatory and statutory scheme.
A similar example can be found in the Lacey
Act,59 which imposes civil and criminal penalties
for violations of any law, treaty, or regulation of
the United States or Indian tribal law concerning
the taking of fish, wildlife, or plants. A sample of
the statutory language establishing these criminal

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

9

offenses can be found in 16 U.S.C. § 3373(d)(1)(A),
which provides a criminal penalty for any person
who “knowingly imports or exports any fish or
wildlife or plants in violation of any provision of
this chapter,” and in 16 U.S.C. § 3372(a)(1), which
states that “[i]t is unlawful for any person…to import, export, transport, sell, receive, acquire, or purchase any fish or wildlife or plant taken, possessed,
transported, or sold in violation of any law, treaty,
or regulation of the United States or in violation of
any Indian tribal law.” Again, mens rea terminology
is included in the original statutory provision, but
the specific prohibited conduct is spread across numerous laws, regulations, and even treaties.
As these examples demonstrate, even when Congress includes a mens rea requirement in a statute,

that language, located in the federal code, can be so
far removed from the language in federal regulations
defining the prohibited conduct that it is difficult to
determine what mens rea requirement, if any, applies
to each element of the criminal offense.
The explosive growth that federal criminal law
has undergone in recent decades should alone be
sufficiently troubling to anyone in a free society.
When coupled with the disappearance of adequate
mens rea requirements, the proliferation of poorly
drafted criminal offenses that are vague and overbroad, and the widespread delegation to unelected
officials of Congress’s authority to criminalize, the
expanded federal criminal law becomes a broad
template for the misuse and abuse of governmental power.

III. Rationale and Summary of Methodology
A. Rationale for the Study of the
Legislative Process
This study fills a quantitative gap, addressing
the increasing concern on the part of many academics and experts60 over the number and scope

This study fills a quantitative gap, addressing the
increasing concern on the part of many academics and
experts over the number and scope of federal criminal
offenses that lack adequate mens rea requirements.
of federal criminal offenses that lack adequate mens
rea requirements. The study pursued two primary
objectives:
1)	To determine whether the mens rea requirements of non-violent criminal offenses in bills enacted into law differ in
quality and protectiveness from the mens
rea requirements of non-violent criminal
offenses in the entire set of bills introduced; and

10

2)	To determine whether any routine action
or stage in the federal legislative process
results in mens rea requirements that are
more or less protective of individuals who
act without a sufficiently culpable mental
state to warrant criminal punishment.
This study began with the working hypothesis
that debate and oversight of proposed legislation in
the House and Senate Judiciary Committees might
improve the clarity of criminal offenses in bills
moving through Congress and strengthen their
mens rea requirements. The judiciary committees
have special expertise in criminal law, criminal justice legislation, and related matters, and according
to House and Senate rules, only the judiciary committees have express jurisdiction over criminal law
and punishment.
In order to test this hypothesis, the study considered two questions:
1)	How well do the mens rea requirements
in each offense studied protect innocent
actors, defined as those acting without

WITHOUT INTENT

intent to violate the law and lacking the
knowledge that their conduct is unlawful
or sufficiently wrongful to put them on
notice of possible criminal liability?
2)	Is there a correlation between the protection afforded by a bill’s mens rea requirements and its enactment, passage by a
chamber, or consideration by a judiciary
committee?
This study considers a mens rea requirement
to be adequate if it is more likely than not to prevent the government from punishing a person who
did not have a sufficiently culpable mental state
to justify such punishment—that is, if the person
did not know that her conduct was unlawful, did
not intend to violate a law, and did not engage in
conduct that was sufficiently wrongful to put her
on notice of possible criminal liability. As used in
this report, the term “unlawful” means prohibited
by any law, whether that law is criminal, civil, or
administrative in nature. The analysis does not assume that for criminal punishment to be imposed
a person must know that she violated a law that
carries a criminal penalty.

B. Summary of Methodology
The authors and their researchers analyzed
the non-violent criminal offenses in 203 bills (128
from the House and 75 from the Senate) introduced during the course of the 109th Congress.
Because many of the bills included more than
one criminal offense meeting the study’s criteria,
the number of criminal offenses included in the
study (446) is greater than the number of bills.
Each offense’s mens rea requirement was analyzed
and graded as Strong, Moderate, Weak, or None.
If a mens rea requirement fell between two categories, it was assigned an intermediate grade,
for example, None-to-Weak. However, in order
to give the benefit of the doubt to congressional
drafting, these offenses were considered as having
the higher, more protective grade for the purposes of this study’s data reporting and statistical

analyses. For example, an offense having a mens
rea requirement falling between Weak and Moderate is categorized in the online appendix as
Weak-to-Moderate but is treated as Moderate for
all other purposes.

The analysis and grading were based on the level of
protection provided by the actual language of the offense
and were guided by Supreme Court decisions that set
forth (relatively) clear statements defining or interpreting
the mens rea terminology most commonly used in
federal statutes.
The analysis and grading were based on the
level of protection provided by the actual language
of the offense and were guided by Supreme Court
decisions that set forth (relatively) clear statements
defining or interpreting the mens rea terminology
most commonly used in federal statutes. When
assessing each offense, the study did not adopt the
perspective of how an ideal prosecutor would (or
would not) charge the offense and did not consider whether prosecutorial discretion might protect
potential defendants from unjust conviction. Similarly, the study did not consider how an ideal court
would rule on a motion to dismiss or whether a
court would apply a limiting construction to an
offense (for example, the common-law rule of lenity) to aid a particular defendant.61
The researchers also collected data on several
of the major actions that can be taken on legislation by Congress (referral to a judiciary committee,
passage by a chamber, and enactment into law) and
by a judiciary committee (hearing, markup, amendment, and reporting). The Heritage Foundation’s
Center for Data Analysis (CDA) then analyzed
whether statistical, and possibly causal, correlations
exist between these actions and the protectiveness
of mens rea requirements.
The Methodological Appendix included at the
end of this report provides a more complete description of the study’s methodology.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

11

IV. Mens Rea Data Analysis, Calculations, and Findings
This section presents a detailed explanation of
the study’s analysis, including examples of offenses
from each category, a description of the resulting
data, and the results of the statistical analyses.

A. Mens Rea Category Totals

Chart 1 reports the number and proportion of
offenses in each mens rea category.
Chart 2 presents the data from Chart 1 broken
down by chamber.

Chart 2

The total numbers of offenses in each of the
four mens rea categories are summarized in Charts
1 and 2 below.

Inadequate Mens Rea Requirements
More Likely in House Bills
Sixty-two percent of offenses in House bills contained
inadequate mens rea requirements (None or Weak),
compared to 49 percent of offenses in Senate bills.

Chart 1

Majority of Offenses Had Inadequate
Mens Rea Requirements
Of the 446 studied offenses, 255 (57 percent) were
categorized as having either None or Weak mens rea
requirements.

31.8%

50%

62.1%

40%

30%

Studied Offenses, by Mens Rea Grade
57.1%
35%

Studied Offenses in the House (277 Total)

32.5%

29.6%

30.0%

20%

34.8%

7.9%

10%

30%
25%

0%

25.3%

Total
Offenses

20%

None

Weak

Moderate

Strong

82

90

83

22

Studied Offenses in the Senate (169 Total)

15%

50%

8.1%

10%

49.1%
40%

5%
0%

Total
Offenses

30.8%
30%

None

Weak

Moderate

Strong

113

142

155

36

Mens Rea Grade, by Congressional Chamber
House
Senate
Total

None
82
31
113

Weak
90
52
142

Moderate
83
72
155

Strong
22
14
36

Source: Calculations by The Heritage Foundation and the National
Association of Criminal Defense Lawyers.

12

42.6%

Total
277
169
446

20%

18.3%
8.3%

10%

0%

Total
Offenses

None

Weak

Moderate

Strong

31

52

72

14

Source: Calculations by The Heritage Foundation and the National
Association of Criminal Defense Lawyers.

WITHOUT INTENT

Almost three-fifths (57 percent) of all offenses
studied had inadequate (None or Weak) mens rea requirements. By chamber, 62 percent of the House
offenses and 49 percent of the Senate offenses had
inadequate mens rea requirements. Just slightly
more than 8 percent of all offenses studied had
protective, properly drafted mens rea requirements
(Strong). The remainder of the offenses fell into the
Moderate category, meaning that they provide an
intermediate level of protectiveness against unjust
criminal punishment.
As discussed above, this study analyzed the
entire sample of proposed offenses in order to determine whether specific legislative actions might
improve or undermine mens rea requirements. Although enactment may seem the most important
part of the process, Congress typically enacts only
a small percentage of all bills introduced. For example, in the 110th Congress, 11,081 bills were
introduced, of which only 442 (4.0 percent) were
enacted into law. In the 109th Congress, 10,537 bills
were introduced, of which 464 (4.4 percent) were
enacted into law.62
Of the 203 bills studied, 13 (6.4 percent) were
enacted into law, an enactment rate that is 45

percent higher than the rate for all bills introduced
in the 109th Congress. In light of Congress’s documented propensity for enacting criminal offenses,
this may suggest that Congress is more likely to
pass a bill if it contains non-violent offenses or, conversely, that Members of Congress are more likely
to add non-violent offenses to bills that Congress
is likely to pass. This study did not attempt to substantiate either of these hypotheses.

The data may suggest that Congress is more likely to pass
a bill if it contains non-violent offenses or, conversely, that
Members of Congress are more likely to add non-violent
offenses to bills that Congress is likely to pass.
Chart 3 illustrates the substantial consistency
of the strength of mens rea requirements through
the legislative process, from initial proposal to
enactment into law. This answers in the affirmative two of the study’s questions: (1) an analysis
of the mens rea requirements in all non-violent offenses introduced in a single Congress is a sound
basis for studying the entire legislative process for
such offenses; and (2) each stage of the congressional process warrants review and re-evaluation

Chart 3

Mens Rea Requirements: Proposed vs. Enacted Offenses
Offenses, by Mens Rea Grade

38.9%

40%
35%
30%
25%

Proposed Offenses (446 Total)
Enacted Offenses (36 Total)

34.8%

31.8%

30.6%

25.3% 25.0%

20%
15%

8.1%

10%
5%
0%

Total
Offenses

None
113

Weak
9

142

Moderate
14

155

11

5.6%

Strong
36

2

Source: Calculations by The Heritage Foundation and the National Association of Criminal Defense Lawyers.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

13

to ensure that Congress does not continue to create
offenses that put innocent actors at risk of criminal punishment.

B. A Study of Each Mens Rea Category
Through Example Offenses
To provide further insight into the meaning
of the data presented above, this section provides
examples of offenses typical of each category.
While the numbers alone make a powerful statement, they take on even greater significance in the
context of typical offenses.

1. Offenses in the None Mens Rea Category
The 113 non-violent offenses in the None category, which represent 25 percent of the 446 nonviolent offenses introduced in the 109th Congress,
do not require a prosecutor, court, or jury to engage in a meaningful consideration of a criminal
defendant’s mental state. The defendant’s knowledge, intent, misperceptions, mistakes, or accidents
are essentially irrelevant to his innocence or guilt.
In the online appendix to this report, many of these

The 113 non-violent offenses in the None category, which
represent 25 percent of the 446 non-violent offenses
introduced in the 109th Congress, do not require a
prosecutor, court, or jury to engage in a meaningful
consideration of a criminal defendant’s mental state.
offenses are referred to as “strict liability” offenses
because they do not include any mens rea terminology or requirements. Although some of the
offenses in the None category omit all traditional
criminal law mens rea terminology and instead
rely on tort-law terminology, such as “should have
known,” “reasonably should have known,” or “negligently,” for imposing criminal punishment, these
terms provide little or no protection to the unwary.
Nothing in the language of an offense categorized
as None prevents conviction of a defendant who
did not intend to violate a law and who did not
know that his conduct was unlawful or sufficiently

14

wrongful so as to put him on notice of possible
exposure to criminal responsibility.
An example of an offense in the None category
is found in H.R. 3192, the Paid Family and Medical Leave Act of 2005.63 Section 107(1) of that bill
states that whoever “makes or causes to be made
any false statement in support of an application for
benefits” under the federal Family Medical Insurance Program is guilty of a felony. On its face, the
use of the phrase “false statement” in the offense
suggests that the government must prove that the
defendant acted with mens rea before criminal liability can be imposed. That would indeed be the case
if this offense were rewritten to include, for example, a blanket or introductory mens rea term—i.e.,
“whoever knowingly makes or causes to be made
any false statement in support of an application
for benefits.” So drafted, the offense would require
the government to prove that the defendant knew
that the statement was false (and possibly also that
it was made in connection with an application for
benefits).
The actual offense defined by section 107(1),
however, includes no mens rea requirement and is,
in fact, a strict liability offense. The government
need prove only that a defendant made or “caused
to be made” a statement, that the statement was
made “in support of ” a Family Medical Insurance
Program application, and that the statement was in
fact false. If, for example, a man listed an incorrect
date of birth for one of his stepchildren, or a woman entered the wrong year when asked for her date
of hire, these “false statements” would put them at
risk of conviction. According to the express terms
of this offense, the government need not prove that
an applicant’s false statement was material to eligibility for benefits, that the applicant intended to
defraud anyone, or even that the applicant knew
the statement to be false. As with all strict liability
offenses, the government need not prove that the
defendant knew anything at all. For these reasons,
this offense is categorized as None.
A second example of an offense in the None
category is found in section 2(c) of S.  3506, the
Data Theft Protection Act.64 That provision states:
“It shall be unlawful for any person to use a means

WITHOUT INTENT

of identification or individually identifiable health
information obtained directly or indirectly from a
Federal database in furtherance of a violation of
any Federal or State criminal law.” It might appear
that the final clause, requiring the conduct to be carried out “in furtherance of a violation of ” another
criminal law, provides the protection of a mens rea
requirement. However, nothing in the statute requires the defendant to know that the conduct prohibited was in fact “in furtherance of [another] violation” of Federal or State criminal law.

The Stolen Valor Act of 2005 (S. 1998), which
was enacted into law in December 2006, includes
a typical Weak offense. The act amended existing
law such that it is now a federal crime to, among
other things, “knowingly” buy, sell, mail, ship, barter, “or exchange[ ] for anything of value” a wide
variety of military decorations, badges, and medals.65 The bill’s findings indicate that its purpose is
to prevent fraudulent uses of and claims about U.S.
military decorations—for example, falsely claiming

Similarly, while it might appear that the defendant is protected by the offense’s requirement that
there was in fact another “violation…of Federal or
State criminal law,” nothing in this offense requires
that the other violation of federal or state law be
committed by the person who “uses” the personally
identifiable health information. Thus, a healthcare
provider who uses personally identifiable information obtained indirectly from a federal database to
answer questions by a person impersonating an employer or another health-care provider could, under
the language of this offense, be subjected to criminal punishment. Though this offense may appear,
at first glance, to provide a mens rea requirement or
at least some protection for those who act without
mens rea, it in fact provides neither.

This study determined that 142 of the 446 offenses (just
under 32 percent) had Weak mens rea requirements.

2. Offenses in the Weak Mens Rea Category

The Stolen Valor Act’s only mens rea requirement is that the person charged must have “knowingly” engaged in the prohibited conduct. As the
U.S. Supreme Court has recognized, “‘[U]nless the
text of the statute dictates a different result, the
term ‘knowingly’ merely requires proof of knowledge of the facts that constitute the offense.’”68
“The term ‘knowingly,’” the Court stated in Bryan
v. United States, “does not necessarily have any reference to a culpable state of mind or to knowledge
of the law.”69 Consequently, the offense created by
the Stolen Valor Act provides inadequate protection against criminal conviction and punishment
for those who buy, sell, exchange, or ship a military decoration, badge, or medal without any intention of making or furthering a fraudulent claim
of valor. Although the offense’s mens rea requirement provides some protection, that protection is
inadequate. Accordingly, this offense is categorized
as Weak.

An offense is categorized as Weak if its language is reasonably likely to protect from conviction at least some defendants who did not intend
to violate a law and did not have knowledge that
their conduct was unlawful or sufficiently wrongful to put them on notice of possible criminal responsibility. The offenses in this category cannot
be characterized as strict liability because they
include some mens rea requirement and, therefore, proof of a defendant’s culpable mental state
before criminal punishment can be imposed. Unlike those offenses in the None category that have
express mens rea requirements but use tort-law
terminology, the offenses in the Weak category
mostly employ traditional criminal-law mens rea
terminology. This study determined that 142 of
the 446 offenses (just under 32 percent) had Weak
mens rea requirements.

to be the recipient of the Congressional Medal of
Honor or Purple Heart—thereby preserving the
“reputation and meaning of such decorations and
medals.”66 But the offense is not limited to fraudulent conduct. It is written so broadly and with such
weak mens rea protections that it would reach many
acts by perfectly legitimate historians and collectors
who deal in these military decorations.67 Under its
terms, even heirs of a solider who transfer his decorations or medals among themselves in exchange
for other property in the soldier’s estate would risk
imprisonment.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

15

Another example of a Weak mens rea provision
is found in H.R. 3968, the Federal Mineral Development and Land Protection Equity Act of 2005.
Section 506(g)(2) of the bill states that whoever
“knowingly…violates any other environmental
protection requirement set forth in title III [of this
Act] or any regulation issued by the Secretaries to
implement this Act, any provision of a permit issued under this Act (including any exploration or
operations plan on which such permit is based), or
any condition or limitation thereof, shall” be criminally punished.70 The offense’s mens rea element,
“knowingly,” requires the government to prove
that the conduct constituting the violation was not
accidental or inadvertent. However, “knowingly”
does not necessarily require “a culpable state of
mind or…knowledge of the law,”71 nor does it require a showing that the violation resulted in any
harm. Accordingly, this offense is graded as Weak
because it offers little or no protection to those who
are unaware of the law or those who, in good faith,
attempt to comply with it but are unable to do so.

Offenses in the None category combined with offenses
in the Weak category comprise more than half of all the
offenses in this study. Such offenses are wholly inadequate
to prevent unjust prosecutions and convictions.
Whereas this offense is graded as Weak for the
purposes of this study’s data and statistical analyses, it is described in the report’s online appendix as
None-to-Weak. This is because the offense authorizes executive branch officials to engage in regulatory criminalization.72 Though its text contains
a mens rea requirement, most of the prohibited
conduct would be defined by unelected officials
in regulations and even individualized mining permits.73 Blanket criminalization of all regulatory and
permit violations effectively diminishes the protectiveness of the statute’s mens rea requirement and
reduces the likelihood that potential defendants
will be on notice of the requirements and prohibitions that they must observe. Therefore, despite the
presence of a mens rea term, the broad and indeterminate class of conduct that would be criminalized

16

by this offense makes it more like the offenses that
are typical of the None category than those of the
Weak category.
As illustrated by these examples, the great majority of offenses that fall into the Weak category
rely exclusively on the term “knowingly” as a blanket or introductory mens rea requirement. In recent
years, the Supreme Court has stated that the term
“knowingly” requires the government to prove
only that the defendant had knowledge of the facts
constituting the offense,74 thus excluding only accidental or inadvertent conduct. This is insufficient,
however, to protect those lacking knowledge of
wrongdoing and acting without intent to do anything unlawful or even wrongful in part. Weak mens
rea requirements allow for, and inevitably result in,
unjust prosecutions and convictions.
For that reason, it is disturbing that offenses
with Weak mens rea requirements are the second
most common choice of federal legislators proposing non-violent criminal offenses. Even more
disconcerting is the fact that the number of offenses in the None category combined with the
number of offenses in the Weak category comprise more than half of all the offenses in this
study. Offenses in the Weak or None categories
are wholly inadequate to prevent unjust prosecutions and convictions.

3. Offenses in the Moderate Mens Rea Category
The number of offenses in the Moderate category is slightly greater than the number of Weak
offenses. Approximately one-third of the studied offenses, 155 of 446, have mens rea requirements that
place them in the Moderate category. The language
of an offense categorized as Moderate is more
likely than not to prevent an individual from being
found guilty if he did not intend to violate a law
and did not know that his conduct was unlawful or
sufficiently wrongful so as to put him on notice of
possible criminal responsibility. Nevertheless, such
an individual could be convicted under an offense
categorized as Moderate because of, for example,
inconsistent judicial interpretation and application
of the mens rea terms it uses.

WITHOUT INTENT

One example of a Moderate offense is in section 2(a) of H.R. 4148, the Federal Disaster Profiteering Prevention Act of 2005. This section provides criminal penalties for “[w]hoever, in a matter
involving a contract with the Federal Government
for the provision of goods or services, directly or indirectly, in connection with relief or reconstruction
efforts provided in response to a presidentially declared major disaster or emergency, knowingly and
willfully…falsifies, conceals, or covers up by any
trick, scheme, or device a material fact.”75 Based on
Supreme Court precedent, this “willfully” requirement should prevent the conviction of many or
most defendants who did not know that their conduct was unlawful or sufficiently wrongful.76 But as
the Court itself has observed, “willful” is a word of
many meanings, and its construction is often influenced by its context.77 Federal courts therefore do
not apply a standard meaning to “willfully.” It is primarily for this reason that offenses using “willfully”
as a blanket or introductory mens rea requirement,
with nothing more, are categorized as Moderate
rather than Strong.
Another example of a Moderate offense is in
section 5 of H.R. 4572, the Export Administration
Renewal Act of 2005. This offense provides that
“[a]ny individual…who willfully violates, conspires
to violate, or attempts to violate any provision of
this Act or any regulation, license, or order issued
under this Act shall be fined up to 10 times the value of the exports involved or $1,000,000, whichever is greater, imprisoned for not more than 10
years, or both, for each violation.”78 This offense
is graded Moderate because, as in the preceding
example, the blanket or introductory usage of the
“willfully” requirement should prevent the conviction of most defendants who did not intend to violate the law and did not know their conduct was
unlawful or sufficiently wrongful so as to put them
on notice of criminal responsibility. But this mens
rea requirement cannot be relied upon to provide
adequate protection for all such defendants because federal courts do not apply a standard meaning to “willfully.”
This offense is not, however, strictly Moderate.
Rather, the strength of the mens rea requirement

in H.R. 4572 falls between Weak and Moderate
because it incorporates a large, open-ended set
of regulatory violations. Thus, even experts in export law would have a difficult time being aware
of all of the regulations under which criminal
punishment might be imposed. Yet some courts
might conclude that individuals performing actions covered by the Export Administration Act

Approximately one-third of the studied offenses, 155 of
446, have mens rea requirements that place them in the
Moderate category.
have a duty to know all Export Administration
Act regulations and therefore impute constructive knowledge of any unlawfulness to the individual because he knew that the field is heavily
regulated. Wholesale incorporation of regulations into criminal offenses thereby undermines
the protectiveness of mens rea requirements. For
this reason, H.R. 4572 is categorized in the online appendix as Weak-to-Moderate, not simply
Moderate.
Blanket or introductory uses of the mens rea
term “willfully” make up the great majority of the
offenses categorized as Moderate. The offenses in
this category would provide an uncertain amount
of protection for defendants charged under them
because of the inconsistency with which courts interpret and apply the term “willfully.”

4. Offenses in the Strong Mens Rea Category
The language of an offense categorized as
Strong is highly unlikely, absent substantial misinterpretation, to permit the conviction of a person
who did not intend to violate a law and did not have
knowledge that his conduct was unlawful or sufficiently wrongful to put him on notice of possible
criminal responsibility. Virtually every criminal offense that Congress passes or even considers should
include mens rea requirements that are this protective. It is therefore of significant concern that only
a small percentage of the studied offenses fall into
this category.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

17

One example of an offense in the Strong category is in H.R. 5188, Jane’s Law, which criminalizes evasion of court-ordered child support payments. The offense in section 2(a) states:
Whoever knowingly, travels in interstate or
foreign commerce, with the intent to evade
compliance with a court ordered property
distribution as part of a separation or divorce
settlement involving more than $5000, with
respect to a spouse or former spouse, shall
be fined under this title or imprisoned for not
more than two years or both.79

The introductory mens rea term, “knowingly,”
can be relied upon to provide protection against
conviction for inadvertences. But the key to the
strength of the overall mens rea requirement is
the phrase “with the intent to evade compliance
with a court ordered property distribution.” It
is difficult to imagine a scenario in which a person could, without knowledge that such action is

Virtually every criminal offense that Congress passes or
even considers should include mens rea requirements that
would be categorized as Strong, but fewer than one out of
every 12 of the offenses in this study was so categorized.
unlawful, act with intent to evade an order from
the court. The court order referenced in this offense is a directive of law handed down from the
court to the defendant, and thus the inclusion of
this phrase in this offense requires the person to
act with a specific intent to violate the law. For this
reason, the offense in H.R. 5188 is categorized as
Strong.
S. 414, the Voter Protection Act of 2005, contains another example of an offense categorized as
Strong. Section 303 states that whoever “destroys
or damages any property with the intent to prevent
or impede an individual from voting in an election
for” federal office is guilty of a federal crime.80 Properly applied, the mens rea phrase “with the intent
to” should protect from conviction anyone who accidentally damages voting equipment without the

18

intent of preventing or impeding an individual from
voting. If an inattentive truck driver, for example,
crashes while delivering voting machines and destroys them, he might be charged under state law
for reckless driving, depending on the circumstances. But unless evidence shows that the truck driver’s
actual intent was to prevent voting, it would be a
misapplication of the plain language of this offense
for him to be convicted under it. This is because the
mens rea requirement in the offense properly restricts
its application to the behavior it is intended to punish: intentionally preventing citizens from voting.
Absent that specific intent, criminal punishment is
unlikely to be imposed.
A final example illustrating one “best practice”
approach to fashioning strong mens rea requirements is in section 515(b) of H.R. 1295, the Responsible Lending Act. This offense includes both
a blanket or introductory “willfully” mens rea term
and a specific requirement that, for culpability to
attach, an individual must know that he is acting in
violation of the law: “It shall be unlawful to willfully disclose to any person any information concerning any person who is a mortgage broker or is
applying for licensing as a mortgage broker knowing the disclosure to be in violation of any provision of this title (a) requiring the confidentiality
of such information; or (b) establishing a privilege
from disclosure….” Because of the proper use of
the “willfully” and “knowing” terms, this offense is
categorized as Strong.
Despite these salutary examples, fewer than
one out of every 12 of the offenses in this study
contained mens rea requirements protective enough
to be categorized as Strong. This may be due to the
difficulty and occasional linguistic awkwardness
involved in drafting a protective mens rea requirement. It might also be caused by Members of Congress (and the public) overlooking the possible injustices resulting from criminal laws that are vague
and overbroad, that fall short of providing fair notice, and that fail to require a level of culpability
sufficient to justify criminal punishment. Nevertheless, fundamental principles of justice mandate
that nearly all of the non-violent criminal offenses

WITHOUT INTENT

in this study should have included a Strong mens
rea requirement.
In summary, the study’s categorization analysis
found that:
•	 Almost three-fifths of all non-violent offenses proposed had inadequate (Weak
or None) mens rea protections;
•	 Fewer than one out of every 12 offenses
contained protections that are fully adequate to protect against unjust conviction (Strong); and
•	 One out of every three offenses had
mens rea requirements inhabiting a middle ground (Moderate), leaving open the
possibility of conviction of those whose
level of culpability does not warrant
criminal punishment.

C. The Reliance on Judiciary Committee
Oversight
Despite the special expertise and jurisdiction
of the House and Senate Judiciary Committees
over matters of criminal law and criminal justice,
Chart 4 demonstrates that more than half of the
studied offenses were not referred to either committee for oversight.
As Chart 4 shows, only 214 (48.0 percent) of
the 446 offenses studied were in bills that were
referred to the respective judiciary committee.
While nearly 55 percent of the 277 House offenses were referred to the House Judiciary Committee, only 37 percent of the 169 Senate offenses
were referred to the Senate Judiciary Committee. This is despite these committees’ special expertise in crafting criminal offenses, knowledge
of the priorities and resources of federal law enforcement, and express jurisdiction over federal
criminal law.
For example, since its creation in 1816, the Senate Judiciary Committee has had jurisdiction over

Chart 4

Less than Half of Offenses Were
Referred to Judiciary Committees
Percentage of Offenses in Study Referred
to Respective Judiciary Committee
60%

54.5%
48.0%

50%

37.3%

40%
30%
20%
10%
0%

Total
Offenses

House

Senate

Total

151 of 277

63 of 169

214 of 446

Source: Calculations by The Heritage Foundation and the National
Association of Criminal Defense Lawyers.

“legislation related to criminal justice.”81 Further,
the Rules of the Senate provide that to the Senate
Judiciary Committee “shall be referred all proposed
legislation, messages, petitions, memorials, and
other matters relating to…[j]udicial proceedings,
civil and criminal, generally.”82 The rules grant express authority over criminal justice matters to no
other Senate committee. Nevertheless, over 62 percent of the studied offenses that were introduced
in the Senate received little or no oversight from
the Senate Judiciary Committee and did not benefit
from its special expertise.
As discussed above, this study sought to determine whether oversight by the judiciary committees correlated with stronger mens rea requirements
in the studied offenses.83 Thus, in addition to passage and enactment, five different congressional
actions (judiciary committee referrals, hearings,
markups, amendments, and reports) were tested
to determine whether such correlations existed.
These calculations and their results are discussed
further below.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

19

D. Identifying the Effect of Congressional
Actions on Mens Rea Requirements
The Heritage Foundation’s CDA analyzed the
study’s data to determine whether a statistically
significant correlation existed between the strength
of mens rea requirements in offenses and congressional actions taken on the bills containing those
offenses. If a statistically significant correlation exists between the strength of mens rea requirements
and a congressional action, it could be positive or
negative. If, for example, there were a negative correlation between the strength of mens rea requirements and enactment into law, that would suggest
that a criminal offense’s mens rea requirement is
likely to be weaker if the bill of which it is a part
is passed by both chambers and signed into law by
the president. Conversely, a positive correlation between the strength of mens rea requirements and
some congressional action might suggest that that
action serves to strengthen mens rea protections or
that bills containing stronger mens rea protections
are more likely to be subject to that action.
The CDA conducted several types of statistical
calculations to look for such correlations. The first
two variables it tested for possible correlations were
whether a bill was (1) passed by its respective congressional chamber and (2) enacted into law. The
data on these two actions are presented in Table 1.

If a bill was marked up by the House Judiciary Committee
or one of its subcommittees, reported by the House
Judiciary Committee for consideration by the full
House of Representatives, or both, the bill’s non-violent
criminal offenses tended to have stronger, more protective
mens rea requirements.
The CDA found no statistically significant correlation between whether a bill was passed by its
originating chamber or enacted into law and the
strength of the mens rea requirements in the bill’s
offenses. In other words, this study’s data provide
no statistical evidence that the mens rea provisions
in non-violent offenses passed by one chamber

20

Table 1

Studied Offenses Passed and Enacted
Originating
Chamber
House
Senate
Total
% of All Studied Offenses

Offenses Passed
by Originating
Chamber
49
21
70
15.7%

Offenses
Enacted
into Law
28
8
36
8.1%

Source: Calculations by The Heritage Foundation and the National
Association of Criminal Defense Lawyers.

or enacted in the 109th Congress were weaker or
stronger than the mens rea provisions in all proposed
non-violent offenses.
Other tests did, however, reveal statistically
significant correlations. The CDA found that the
strength of the mens rea requirements in a bill introduced in the House has a weak, positive correlation with that bill’s being (a) marked up by the
House Judiciary Committee or one of its subcommittees and (b) reported out of the House Judiciary
Committee for consideration by the full House of
Representatives. Put differently, if a bill was marked
up by the House Judiciary Committee or one of
its subcommittees, reported by the House Judiciary Committee for consideration by the full House
of Representatives, or both, the bill’s non-violent
criminal offenses tended to have stronger, more
protective mens rea requirements.
On the Senate side, however, no statistically
significant correlations were found between the
strength of mens rea requirements and any action
taken by the Senate Judiciary Committee or its subcommittees.
When the data for the House and Senate bills
are aggregated and analyzed together, a weak but
statistically significant positive correlation appears
between the strength of the studied offenses’ mens
rea requirements and their bills being marked up by
or reported out of either the House Judiciary Committee or the Senate Judiciary Committee. In other
words, legislation that was marked up or reported
out by either judiciary committee tended to contain

WITHOUT INTENT

stronger mens rea requirements than bills not subject to these actions. This finding, however, appears
to reflect the correlation identified above involving
actions taken by the House Judiciary Committee,
and so does not contradict the failure to find any
correlations involving actions taken by the Senate
Judiciary Committee.
Finally, Heritage’s CDA tested whether each
of the other three judiciary committee actions recorded (referral to a judiciary committee, hearing,
and amendment) was correlated with the strength
of mens rea requirements. It found no statistically
significant relationships.84

E. The Regulatory Criminalization
Problem
As part of the individual assessment of the
studied offenses, the authors determined whether
Congress itself articulated the actus reus and mens
rea of the offense or if Congress sought, in the
statutory language of “the offense,”85 to delegate
that responsibility to an unelected agency, body,
or individual acting on behalf of such an agency
or body. The authors endeavored to make note of
every offense that included regulatory criminalization in order to determine the frequency with
which Congress attempts to delegate its criminal
lawmaking authority. The resulting data underscore concerns that have been raised about regulatory criminalization.86
Table 2 presents this data, broken down by
chamber and by three legislative actions (introduction, passage, enactment). Of the 446 studied
offenses, 63 (14 percent) authorized regulatory
criminalization. The percentage of offenses authorizing regulatory criminalization is even greater among those offenses passed by one chamber
(17 percent) or enacted into law (22 percent).
Nearly one-quarter of the enacted offenses allow
additional criminal offenses to be created, not by

Table 2

Regulatory Criminalization by Chamber
Of the 36 studied offenses that were enacted into law,
eight (22 percent) delegated criminal lawmaking authority to unelected regulators.
Introduced
41 of 277
(14.8%)

Passed
9 of 49
(18.4%)

Enacted
5 of 28
(17.9%)

Senate

22 of 169
(13.0%)

3 of 21
(14.3%)

3 of 8
(37.5%)

Total

63 of 446
(14.1%)

12 of 70
(17.1%)

8 of 36
(22.2%)

House

Source: Calculations by The Heritage Foundation and the National
Association of Criminal Defense Lawyers.

Congress, but by unelected and less accountable
agency officials.
This result has significant ramifications. When
Congress enacts a single offense authorizing regulatory criminalization, it effectively attaches criminal penalties to regulations, rules, and orders that
may not yet have been contemplated, let alone

Nearly one-quarter of the enacted offenses allow
additional criminal offenses to be created, not by Congress,
but by unelected and less accountable agency officials.
drafted and made into law. A single criminal offense
may serve as the authority for any number of additional, regulatory criminal offenses. Whereas the
ABA Task Force in 1998 and Professor John Baker
in 2008 reported scholarly estimates of the number of criminal offenses in federal statutes, both acknowledged that, at a minimum, there are tens of
thousands of additional criminal offenses in federal
regulations.87 Regulatory criminalization thus has
profound implications for the problem of how to
ensure individuals and businesses receive fair notice
of what conduct can be punished criminally.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

21

V. Conclusions on the Legislative Process
The primary conclusion of this report is that
non-violent criminal offenses lacking adequate
mens rea requirements are ubiquitous at every stage
of the federal legislative process. Although two
steps in the legislative process appear to improve
the quality of mens rea requirements, a majority
of the non-violent offenses Members of Congress
introduce have flawed mens rea requirements, and
this percentage does not improve through the process. Further, the majority of non-violent criminal
offenses introduced in the 109th Congress were
drafted with language that is ambiguous and has
uncertain legal effect, to the greatest detriment of
the average layperson with no legal training. In addition, a sizeable percentage of proposed criminal
offenses, and a larger percentage of those passed by
a chamber or enacted, would have delegated Congress’s criminal lawmaking authority to regulators.

The primary conclusion of this report is that
non-violent criminal offenses lacking adequate
mens rea requirements are ubiquitous at every
stage of the federal legislative process.
Further, the neglect of the special expertise of
the House and Senate Judiciary Committees is profound; less than one-half of the studied offenses
were referred to either committee. This study, as
well as the experience of its authors, strongly suggests that Members of Congress propose so many
new criminal offenses and modifications to existing offenses that only a small percentage of these
proposals could possibly receive meaningful oversight by the judiciary committees or benefit from
their special expertise. In the past, the judiciary
committees performed a vital gate-keeping function in preserving the consistency and integrity of
federal criminal law, but today they are overrun.
Increasingly, new and modified criminal offenses
are proposed, shepherded through Congress by
their sponsors, and even enacted without affording
deference to the committees, their expertise, or
their unique jurisdiction over the federal criminal
justice system.

22

A. Mens Rea Requirements Are
Inadequate at Every Step of the
Legislative Process
As shown in the following tables, 44 of the 70
offenses passed in either chamber and 23 of the 36
offenses enacted into law were categorized as None
or Weak. In other words, 63 percent of the offenses
passed by a chamber of Congress and 64 percent of
the offenses actually enacted into law had wholly
inadequate mens rea requirements.
As shown in Table 3 and Chart 5 below, the
mens rea requirements of non-violent offenses in
bills that were passed by their originating chamber
are, on average, actually weaker than those in all
proposed non-violent offenses. Though this difference may not be statistically significant, it does
demonstrate that the mens rea requirements in bills
that pass a chamber are not of higher quality than
those in bills that do not.
Chart 5 demonstrates a similar consistency
between the percentage of non-violent offenses
enacted into law that have inadequate mens rea
requirements (Weak or None) and the percentage of all proposed non-violent offenses that have
inadequate mens rea requirements. The percentage
of enacted offenses that fall into the Strong category is somewhat lower than the percentage for the
total sample. Moreover, a larger percentage of
enacted offenses fall into the Weak category. The
percentage of offenses that are categorized as None
is approximately the same for enacted offenses and
all proposed offenses, while the percentage of offenses in the Moderate category is slightly lower
for those offenses that were enacted into law than
for all the proposed offenses. In sum, the composite profile of the strength or weakness of mens rea
requirements for all proposed non-violent offenses
is consistent with that of those offenses that were
enacted into law.
The data show that, at all stages of the legislative process, the majority of offenses lack adequate
mens rea requirements. This problem is not unique

WITHOUT INTENT

Table 3

Mens Rea Requirements Throughout the Legislative Process
Offenses, by Mens Rea Grade
Studied (446 Total)
House
Senate
Total
%

Passed (70 Total)

Enacted (36 Total)

None
82
31
113

Weak Moderate Strong
22
83
90
14
72
52
36
155
142

None
12
4
16

Weak Moderate Strong
5
14
18
1
6
10
6
20
28

None
7
2
9

Weak Moderate Strong
2
8
11
0
3
3
2
11
14

25.3%

31.8%

22.9%

40.0%

25.0%

38.9%

34.8%

8.1%

28.6%

8.6%

30.6%

5.6%

Source: Calculations by The Heritage Foundation and the National Association of Criminal Defense Lawyers.

to the 109th Congress. For almost three years, every
criminal offense introduced in Congress that fits
this study’s criteria has been reviewed for The
Heritage Foundation’s Overcriminalized.com Web
site.88 The percentages of criminal offenses in each
of the four mens rea categories for non-violent
offenses introduced in the 109th Congress appear
to be generally consistent with those introduced
in the 110th Congress.
Public debate in recent Congresses over mens
rea requirements has been rare, with few Members

objecting to proposed criminal offenses with mens
rea requirements that this study would characterize as None or Weak.89 Rather, most Members of Congress appear to be sensitive to the
potential political costs of appearing to be “soft on
crime” by strengthening mens rea requirements to
protect those acting without culpable intent. The
current system is not working, and Congress will
need new structural and procedural devices if it
is to thwart this political pressure and return to
crafting criminal offenses with adequate mens rea
requirements.

Chart 5

Mens Rea Requirements of Studied, Passed, and Enacted Offenses
Offenses, by Mens Rea Grade

Passed

Enacted

34.8%

35%

31.8%
28.6%

30%
25%

Studied

40.0% 38.9%

40%

25.3%

22.9%

30.6%

25.0%

20%
15%

8.1%

10%

8.6%
5.6%

5%
0%

None

Weak

Moderate

Strong

Source: Calculations by The Heritage Foundation and the National Association of Criminal Defense Lawyers.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

23

B. The Judiciary Committees Are
Frequently Afforded No or Inadequate
Opportunities for Oversight of Criminal
Offenses
Congress consistently neglects the special expertise of the two judiciary committees when drafting criminal offenses. Over one-half (52 percent)
of the criminal offenses in this study were neither
referred to a judiciary committee nor subject to
any oversight by either committee. The number of
criminal offenses proposed and enacted has grown
so sharply that, on the whole, individual Members
of Congress and congressional leaders may have
concluded that the judiciary committees lack the
time and resources to review every criminal offense
that is proposed. Thus, for expediency or for strategic purposes, Members may forgo or even evade
judiciary committee review.

Without adequate mens rea requirements, these
federal criminal offenses greatly increase the danger
that law-abiding individuals will find themselves facing
prosecution and even prison time in the federal system.
Bypassing the judiciary committees may not
always be intentional. This study frequently uncovered criminal offenses that were buried in
much larger bills entirely unrelated to criminal
law and punishment. It may be that these offenses
were simply overlooked or were obscure enough,
in the context of their legislative vehicles, to fail
to alert anyone to the need for judiciary committee review. In some cases, criminal offenses
may be added to a bill by amendment after the
bill has already been assigned to a non-judiciary
committee or once the bill is on the floor of its respective chamber. When this happens, unless the
Members of Congress responsible for the amendment containing criminal provisions pause the
process, notify their chamber’s judiciary committee, and grant that committee sufficient time to
review and appropriately revise the criminal provisions, judiciary committee members may not
even know that the amendment contains criminal
provisions.90 While the cause of this neglect is not

24

entirely clear, the result is that hundreds of criminal offenses are being proposed in a typical Congress, and many of them are not afforded judiciary
committee oversight.

C. The Proliferation of Federal Criminal
Law Continues
Much has already been said about the magnitude of new criminalization that was proposed and
enacted by the 109th Congress. The numbers speak
for themselves:
•	 446 non-violent criminal offenses were
introduced,
•	 70 non-violent criminal offenses were
passed by at least one chamber, and
•	 36 non-violent criminal offenses were
enacted into law.
Given these large numbers, it unsurprising that
Congress created 452 entirely new crimes from
2000 through 2007,91 legislating at a rate of over one
new crime each week for every week of every year.
Without adequate mens rea requirements, these federal criminal offenses greatly increase the danger
that law-abiding individuals will find themselves
facing prosecution and even prison time in the federal system. These numbers do not, of course, capture the full magnitude of the effect that regulatory
criminalization authorized by the 36 newly enacted
offenses will have on federal law.
Further, these numbers concern only those
types of offenses included in this study, generally
non-violent, non-drug, non-firearm, non-pornography, and non-immigration offenses. Many additional offenses that were not a part of this study
were proposed during the 109th Congress and ultimately enacted into law.

D. Poor Legislative Draftsmanship Is
Commonplace
The lack of clarity in the studied offenses cannot
be quantified, though its existence and frequency

WITHOUT INTENT

are plain. The authors can attest to the many hours,
days, and months that went into performing these
individual assessments and to the significant proportion of that time spent trying to answer such
questions as:
•	 What conduct is actually covered by
this offense and what conduct is not?
•	 How far into the language of the statute
does the mens rea terminology extend,
and to which elements?
•	 To which current federal laws and
to which regulations (assuming they
have already been promulgated) does
this statute refer, and which does it
incorporate?
Questions of this sort required substantial research, deliberation, and discussion before an offense could be categorized. Some appreciation of
this process may be gleaned from the individual assessments in the online appendix, which illustrate
much of this reasoning for the benefit of readers
and other researchers.
The complexity of this part of the study’s analysis is offered as further evidence in support of the
criticisms that have been leveled against Congress’s
criminal lawmaking by academics, practitioners,
judges, and others. Congress frequently fails to speak
clearly and with the necessary specificity when legislating criminal offenses. Consider, for example, the
Flores-Figueroa litigation discussed above.92 It took
several years of litigation and the opinions of three
different courts, including the United States Supreme Court, to determine the meaning of a single
criminal offense, which is all of one sentence long.
Another example can be found in the federal honest services fraud statute.93 More than 20 years after
the statute’s enactment, the federal circuit courts
are hopelessly divided over this exceedingly vague
and overbroad statute. The statute is finally being
scrutinized by the Supreme Court, and the Justices
face the choice of striking the statute down on the
ground of vagueness, saving the statute by doing
Congress’s job of making it more definite and precise, or allowing the chaos and confusion surrounding the statute’s meaning to continue.94

This complexity has serious consequences.
When tort law or other civil law is vague, unclear, or confusing, there can be substantial consequences. But those consequences generally

Congress frequently fails to speak clearly and with the
necessary specificity when legislating criminal offenses.
take the form of monetary damages. When the
criminal law is vague, unclear, or confusing, the
consequences are particularly dire: the misuse of
governmental power to unjustly deprive individuals of their physical freedom.

E. Congress Regularly and Inappropriately
Delegates Criminal Lawmaking Authority
Finally, the amount of regulatory criminalization authorized in the studied offenses demonstrates that congressional delegation of its authority to make criminal law occurs at every stage
of the legislative process and, notably, more frequently in those studied offenses that were either
passed by a chamber or enacted into law than in
the larger sample of proposed offenses. Specifically, 14 percent of all proposed non-violent offenses included some form of regulatory criminalization. That increases to 17 percent among
only those offenses passed by one of the chambers of Congress. The figure increases yet again,
to 22 percent, among enacted offenses. In raw
numbers, eight of the 36 offenses enacted into
law delegate Congress’s authority to make criminal laws. Those eight offenses were contained
in four separate bills, two originating from each
chamber.
As previously discussed, these numbers do not
reflect the actual number of offenses that will be
added to federal criminal law. Almost every time
such offenses are enacted into law, countless additional federal regulations also become criminal
offenses. In fact, the regulations that become
punishable as crimes often do not even exist at the
time the statutory offense is enacted. But statutory

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

25

offenses authorizing criminalization by administrative agencies typically do not limit criminal
exposure just to regulations; in addition, they often create criminal exposure based on violations
of any “rules” or “orders” issued by the agency
or its officials. For these reasons, the presence
of these regulatory criminalization offenses prevents the authors from providing a complete
tally of the number of criminal offenses that
will result from the bills enacted by the 109th
Congress. Rather, this study’s data provide only

The question of whether a matter is important enough
to send a person to prison should be decided by the
people’s elected representatives.
the minimum number of federal criminal offenses enacted into law by this single Congress.
The ultimate number is likely to be considerably
higher.
While it might strike some as odd that Congress so readily and frequently abdicates its constitutional authority to create criminal laws, there
are several possible explanations. The most obvious is expediency: Some believe that, rather than
devoting time and energy to actually defining
regulations, Congress should focus on broader
policymaking. Other arguments for delegation

generally assert that decisions about technical
areas of administrative law should be left to those
with specific expertise. Whatever merit these arguments may have, they lack persuasiveness with
respect to Congress’s power and responsibility to
define what conduct and mental state justifies depriving an individual of her personal freedom. The
question of whether a matter is important enough
to send a person to prison should be decided by the
people’s elected representatives.
Other explanations that have been offered are
more cynical. Delegating to administrative agencies the authority to make criminal law might allow Members of Congress the benefit of appearing “tough on crime” without being politically
accountable to the individuals most affected by
regulatory criminalization. Further, Congress can
obtain this benefit without performing the arduous drafting process that the criminal law traditionally requires. A more generous argument is
that most Members of Congress simply do not
fully realize the many negative ramifications of
this type of delegation.
Regardless of the explanation, Congress frequently and consistently delegates its criminal lawmaking authority. This delegation results in more
regulatory criminalization, which, in turn, contributes to the continued proliferation of the federal
criminal law.

VI. Ending the Trend: Federal Criminal Law Reforms

26

Congress should adopt basic, good-government
reforms that will slow, stop, or even reverse the dangerous trend of haphazard federal criminalization.
This shift should begin with the recognition that
the proliferation of criminal offenses lacking meaningful mens rea requirements is a threat to civil liberty. In order to be effective, proper reforms must
be tailored to:

•	 Encourage Congress to legislate more
clearly and deliberatively and with greater coherence; and

•	 Address the root causes of the overcriminalization problem;

The authors of this report recommend the following reforms to bring an end to the deterioration

•	 Reduce Congress’s knee-jerk tendency
to criminalize in response to every problem and as a solution to all of society’s
real and supposed ills.

WITHOUT INTENT

Recommendations
Congress should:
•	 Enact Default Rules of Interpretation to Ensure that Mens Rea Requirements Are Adequate to
Protect Against Unjust Conviction.
•	 Codify the Common-Law Rule of Lenity, which Grants Defendants the Benefit of the Doubt When
Congress Fails to Legislate Clearly.
•	 Require Judiciary Committee Oversight of Every Bill that Includes Criminal Offenses or Penalties.
•	 Provide Detailed Written Justification for and Analysis of All New Federal Criminalization.
•	 Draft Every Federal Criminal Offense with Clarity and Precision.

of mens rea requirements and related problems of
overcriminalization.

A. Enact Default Mens Rea Rules
Of the several reforms that could be implemented to help ensure that innocent individuals
are protected from unjust conviction under federal
criminal offenses that have inadequate mens rea requirements, perhaps the most straightforward and
effective reform would be to codify default rules
for the interpretation and application of mens rea
requirements. This reform would add new provisions to the U.S. Code that would specifically direct
federal courts to grant a criminal defendant the
benefit of the doubt when Congress has failed to
adequately and clearly define the mens rea requirements for criminal offenses and penalties.
The first statutory enactment would address
the unintentional omission of mens rea terminology
by directing federal courts to read a protective, default mens rea requirement into any criminal offense
that lacks one.95 Although it would almost always
be unwise to do so, Congress would remain free to
enact strict liability offenses even after this reform is
implemented, but to do so, it would have to make
its purpose clear in the express language of the statute. Adopting this type of reform would help lawabiding individuals know in advance which criminal offenses carry an unavoidable risk of criminal

punishment and safeguard against unintentional
legislative omissions of mens rea requirements.
The second statutory enactment, similar to
subsection 2.02(4) of the American Law Institute’s
Model Penal Code, would direct courts to apply
any introductory or blanket mens rea terms in a
criminal offense to each element of the offense.96
This reform would eliminate much of the uncertainty that exists in federal criminal law over the
extent to which an offense’s mens rea terminology
applies to all of the offense’s elements. It would
also save all parties—defendants, the government,
and the courts—from having to exhaust their
time and resources litigating this question, as in
the Flores-Figueroa case. Again, Congress could

Perhaps the most straightforward and effective reform
would be to codify default rules for the interpretation
and application of mens rea requirements.
still limit the application of the mens rea terms to
certain elements of the offense, but it would have
to articulate such limitations clearly in the text of
the statute. This reform would greatly reduce the
disparities that exist among the federal courts in
the interpretation and application of mens rea requirements, and thereby result in the fairer, more
consistent application of federal criminal laws.
Further, it would provide additional protection to

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

27

defendants who did not intend to violate the law
and did not have knowledge that their conduct
was unlawful or sufficiently wrongful.
Enacting these two statutory provisions would
improve the mens rea protections throughout federal criminal law, provide needed clarity, force
Congress to give careful consideration to mens rea
requirements when adding or modifying criminal
offenses, and help ensure that fewer individuals are
unjustly prosecuted and punished.

B. Codify the Common-Law Rule of Lenity
A related statutory reform that would reduce
the risk of injustice stemming from criminal offenses that lack clarity or specificity would be to codify
the common-law rule of lenity. The rule of lenity
directs a court, when construing an ambiguous
criminal law, to resolve the ambiguity in favor of
the defendant.97 In a recent U.S. Supreme Court decision, Justice Scalia explained that this “venerable
rule not only vindicates the fundamental principle

The rule of lenity directs a court, when construing an
ambiguous criminal law, to resolve the ambiguity in
favor of the defendant. Adding the rule of lenity to
federal law would serve the rights of all defendants
at every stage of the criminal process.

28

Court has called a fundamental rule of statutory
construction and cited as a wise principle that it
has long followed.100 Despite the Supreme Court’s
statements, the rule has not been uniformly or consistently applied by the lower federal courts, and
adding it to federal law would serve the rights of all
defendants at every stage of the criminal process,
not just those who have the means and opportunity to successfully appeal their convictions to the
Supreme Court. Codifying the rule of lenity would
also protect Congress’s lawmaking authority because it would restrict the ability of federal courts
to legislate from the bench and reduce the frequency with which those courts must speak because
Congress has failed to legislate clearly. Further, it
would require Members of Congress to legislate
more carefully and thoughtfully, with the knowledge that courts would be forbidden from filling in
any inadvertent gaps left in criminal offenses. Most
importantly, an explicit rule of lenity would protect
individuals from unjust criminal punishment under vague, unclear, and confusing offenses by reinforcing the principle of legality, which holds that
no conduct should be punished criminally “unless
forbidden by law [that] gives advance warning that
such conduct is criminal.”101

C. Require Sequential Referral to the
Judiciary Committees

that no citizen should be held accountable for a
violation of a statute whose commands are uncertain, or subjected to punishment that is not clearly
prescribed. It also places the weight of inertia upon
the party that can best induce Congress to speak
more clearly and keeps courts from making criminal law in Congress’s stead.”98 Giving the benefit of
the doubt to the defendant is consistent with the
traditional rules that all defendants are presumed
innocent and that the government bears the burden
of proving every element of a crime beyond a reasonable doubt.99

A third recommended reform is to change congressional rules to require every bill that would
add or modify criminal offenses or penalties to be
subject to automatic sequential referral to the relevant judiciary committee. Sequential referral is the
practice of sending a bill to multiple congressional
committees. In practice, the first committee has exclusive control over the bill until it reports the bill
out or the time limit for its consideration expires, at
which point the bill moves to the second committee in the sequence, in the same manner. Whereas
every new or modified criminal offense introduced
in Congress should be subject to automatic referral to a judiciary committee, more than half of the
studied offenses received no such referral.

Explicitly applying the rule of lenity to federal
criminal law would simply codify what the Supreme

Judiciary committee referral may not automatically produce stronger, more protective mens rea

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requirements. However, this study’s statistical analysis of the relationship between the strength of mens
rea requirements and specific actions by the House
Judiciary Committee, considered in the context of
the special expertise and jurisdiction of both judiciary committees, make it reasonable to conclude
that automatic sequential referral would likely:
•	 Reduce the practice of including new or
modified criminal offenses in many bills
unrelated to crime and punishment;
•	 Reduce the frequency of regulatory
criminalization; and
•	 Stem the overall tide of federal criminalization by forcing a measured and prioritized approach to criminal lawmaking.
This assumes, of course, that the committees carefully review, rather than rubber-stamp, proposed
criminal offenses. The judiciary committees alone
have the special competence and expertise required
to properly draft and design criminal laws. Automatic referral should result in clearer, more specific, and higher quality criminal offenses.
More importantly, this rule could stem the tide
of criminalization by forcing Congress to adopt
a measured and prioritized approach to criminal
lawmaking. Members of Congress have grown accustomed to thinking of criminal offenses as an
appropriate feature of any piece of legislation. But
as this study shows, ensuring that a proposed criminal offense is a necessary addition to federal criminal law—and that it is properly drafted—requires
substantial expertise with the intricate details of
criminal law as well as its broader operation and
objectives. The House and Senate Judiciary Committees are uniquely positioned to evaluate:
•	 Whether the approximately 4,450 statutory criminal offenses and an estimated
tens of thousands of regulatory criminal
offenses now in federal law already cover
the conduct being criminalized;
•	 Whether a new offense is consistent
with the Constitution, particularly constitutional federalism’s reservation of
general police power to the 50 states;

•	 Whether federal law enforcement has the
resources to investigate and prosecute a
new offense, and whether federal public
defenders have the resources to defend indigent defendants charged under it; and
•	 Whether enforcing a new offense will
divert resources from more important
law enforcement goals.
These fundamental questions should be answered
before Congress considers enacting any new criminal offense. If the judiciary committees carefully
considered these and related questions for each
proposed criminal offense, Members of Congress
might become reluctant to propose new or modified offenses that are ill conceived, poorly drafted,
or superfluous.

Requiring sequential referral of all bills with criminal
provisions to the judiciary committees would also
increase congressional accountability for new
criminalization, help prioritize criminal legislation,
and reduce overcriminalization.
Further, the special expertise for fashioning
mens rea requirements that are no broader than
necessary to allow conviction of only those who
are truly culpable or blameworthy resides in the
judiciary committees. Prosecutorial discretion plays
an important role in the American criminal justice
system, particularly in selecting enforcement priorities, determining whether the evidence is sufficient
to support a prosecution, and negotiating plea bargains where the evidence of a defendant’s culpability is strong. But a criminal offense should never be
so broad, or its mens rea requirements so lax, that it
allows prosecutors to obtain convictions of persons
who are not truly blameworthy and who did not
have fair notice of possible criminal responsibility.
The judiciary committees are in the best position
to ensure that Congress ends its practice of passing
these dangerous criminal offenses.
Requiring sequential referral of all bills with
criminal provisions to the judiciary committees
would also increase congressional accountability

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

29

for new criminalization, help prioritize criminal
legislation, and reduce overcriminalization. As it
now stands, no single committee can take overall responsibility for reducing the proliferation of
new (and often unwarranted, ill-conceived, and
unconstitutional) criminal offenses or for ensuring
that adequate mens rea requirements are a feature
of all new and modified criminal offenses. Sequential referral would empower the judiciary committees to take responsibility for all new criminal
provisions. Further, Members of Congress and
the public would know that they should address
their interests and concerns about new criminal
offenses to the judiciary committees, which could
act on them.
Finally, the judiciary committees are well positioned to prioritize new criminal offenses because
they have the best information about the level and
allocation of federal law enforcement’s resources
and must operate within their own time and resource limitations. Such prioritization should reduce the proliferation of federal criminal offenses,
the erosion of adequate mens rea requirements from
federal criminal law, the unwarranted and unconstitutional federalization of inherently local crime,
and other forms of overcriminalization. Given the
current neglect of these concerns in the legislative
process, such improvements would be a welcome
change.

D. Require Reporting on All New Federal
Criminalization
The fourth reform is a reporting requirement
for all new federal criminalization, which would
work hand-in-hand with the sequential referral

This reform proposal would require Congress to deliberate
over and provide factual and constitutional justification
for every expansion of the federal criminal law.
reform. Similar to a bill Representative Don Manzullo
(R–IL) introduced in 2001, this reform would require
the federal government to produce a regular public report that includes much of the information

30

necessary to assess the purported justification,
costs, and benefits of all new criminalization.
Today, there is no effective check on overcriminalization. Over the past half century, the political
pressures to criminalize have been difficult for most
Members of Congress, irrespective of party affiliation, to resist. In addition, federal regulators who
criminalize conduct should be subject to far more
public accountability than they are today. This reform would help to provide such accountability by
requiring the federal government to perform basic
but thorough reporting on the grounds and justification for all new and modified criminal offenses
and penalties. Implementing this reform would require rules changes in both chambers of Congress
and statutory reporting requirements governing
the federal agencies that create and modify criminal
offenses and penalties.
For every new or modified criminal offense or
penalty that Congress passes, it must report:
•	 A description of the problem that the
criminal offense or penalty is intended to
redress, including an account of the perceived gaps in existing law, the wrongful
conduct that is currently unpunished or
under-punished, and any specific cases
or concerns motivating the legislation;
•	 A direct statement of the express constitutional authority under which the federal government purports to act;
•	 An analysis of whether the criminal offenses or penalties are consistent with
constitutional and prudential considerations of federalism;
•	 A discussion of any overlap between the
conduct to be criminalized and conduct
already criminalized by existing federal
and state law;
•	 A comparison of the new law’s penalties
with the penalties under existing federal
and state laws for comparable conduct;
•	 A summary of the impact on the federal
budget and federal resources, including the judiciary, of enforcing the new

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offense and penalties to the degree required to solve the problem that the new
criminalization purports to address;
•	 A review of the resources that federal
public defenders have available and need
in order to adequately defend indigent
defendants charged under the new law;
and
•	 An explanation of how the mens rea
requirement of each criminal offense
should be interpreted and applied to each
element of the offense.
Congress should also collect information on
criminalization reported by the executive branch of
the federal government. This information should
be compiled and reported annually and, at minimum, should include:
•	 All new criminal offenses and penalties
that federal agencies have added to federal regulations and an enumeration of
the specific statutory authority supporting these regulations; and
•	 For each referral that a federal agency
makes to the Justice Department for
possible criminal prosecution, the provision of the United States Code and each
federal regulation on which the referral
is based, the number of counts alleged
or ultimately charged under each statutory and regulatory provision, and the
ultimate disposition of each count.

federal criminal law. In the 109th Congress alone,
federal legislators introduced over 200 bills proposing new or expanded non-violent criminal offenses, and that number does not include the bills
proposing new or expanded criminalization concerning violence, firearms, drugs, pornography,
or immigration violations. Many offenses in these
bills would have created new federal crimes, duplicated existing federal criminal statutes, or provided redundant penalties for crimes already punished under state law. As it stands today, there is no
comprehensive process for Congress to determine
whether these new offenses are necessary and appropriate. A strong reporting requirement reform
would compel Congress to address such matters.

E. Focus on Clear and Careful
Draftsmanship
One overarching reform recommendation is a
slower, more focused, and deliberative approach to
the creation and modification of federal criminal

One overarching reform recommendation is a slower,
more focused, and deliberative approach to the creation
and modification of federal criminal offenses.
offenses. When drafting legislation, Members of
Congress should always:
•	 Include an adequate mens rea requirement;
•	 Define both the actus reus (guilty act) and
the mens rea (guilty mind) of the offense
in specific and unambiguous terms;

Congress should always be required to determine the true cost of new criminal offenses prior
to enactment. The United States is already saddled
with in excess of 4,450 federal statutory criminal offenses, tens of thousands of regulatory criminal offenses, an overworked federal judiciary with an ever-growing case load, and a crowded and expensive
prison system. The federal government’s failure to
assess and justify the full costs of any new or modified criminal offenses or penalties is irresponsible.

•	 Avoid delegating criminal lawmaking
authority to regulators.

This reform proposal would require Congress
to deliberate over and provide factual and constitutional justification for every expansion of the

Criminal offenses frequently fail to define the
actus reus in a clear and understandable manner
and often include an actus reus that is broad,

•	 Provide a clear statement of whether
the mens rea requirement applies to
all the elements of the offense or, if
not, of which mens rea terms apply to
which elements of the offense; and

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

31

overreaching, or vague. Practically speaking, the
magnitude of conduct proscribed by an overbroad
actus reus can actually have a diminishing effect on
the protection afforded by the mens rea provision.
When a criminal offense does not have clearly defined boundaries, the risk of unjust criminal punishment increases. For this reason, legislative drafters
must make every reasonable effort to craft a clear
and precise definition of each criminal offense and
of the offense’s boundaries, regardless of whether
Congress is proposing new criminal offenses or
simply amending existing ones.

The importance of sound legislative drafting cannot be
overstated, for it is the drafting of a criminal offense that
frequently determines whether a person acting without
intent to violate the law will endure a life-altering
prosecution and conviction, and lose his freedom.
Determining the proper mens rea requirement
for a criminal offense requires great deliberation,
precision, and clarity. Any Member of Congress proposing a new or modified federal criminal offense
must carefully consider how the mens rea requirement will actually operate when applied to the specified actus reus. Legislative drafters should almost
never rely merely on a standard mens rea term in the
introductory language of a criminal offense. Instead,
the criminal offenses that provide the best protection against unjust conviction are those that include
specific intent provisions and provide sufficient clarity and detail to ensure that the precise mental state

32

required for each and every act and circumstance in
the criminal offense is readily ascertainable.
The importance of sound legislative drafting
cannot be overstated, for it is the drafting of a criminal offense that frequently determines whether a
person acting without intent to violate the law and
lacking knowledge that his conduct was unlawful
or sufficiently wrongful to put him on notice of
possible criminal liability will endure a life-altering
prosecution and conviction, and lose his freedom.
Members of Congress drafting criminal legislation
must resist the temptation to bypass this arduous
task by handing it off to unelected regulators. The
United States Constitution places the power to
define criminal responsibility and penalties in the
hands of the legislative branch. Therefore, it is the
responsibility of that branch to ensure that no one
is criminally punished if Congress itself did not
devote the time and resources necessary to clearly
and precisely articulate the law giving rise to that
punishment.
These five reforms would help ensure that every proposed criminal offense receives the attention
due when Congress is determining how to focus the
greatest power government routinely uses against
its own citizens.102 Coupled with increased public
awareness and scrutiny of the criminal offenses
Congress enacts, these reforms would strengthen
the protections against unjust conviction and prevent the dangerous proliferation of federal criminal
law. With their most basic liberties at stake, Americans are entitled to expect no less.

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Methodological Appendix

I. The Mens Rea Analysis
A. The Studied Offenses Defined
The best way to define the offenses included in this study is by listing the types of offenses that were
not included. The offenses in this study are not primarily directed at conduct involving firearms, illicit drugs
or other controlled substances, pornography, immigration violations, or what is typically referred to as violent or street crime (murder, rape, robbery, arson, larceny, assault, battery, vandalism, carjacking, etc.). The
relatively few included offenses that actually involve physical damage to property, bodily injury, or death
are not intentional crimes of the sort that have historically been charged as a crime. They are more akin
to the injuries for which a person or organization could be sued because their negligence caused personal
injuries or damage to property, the remedy for which would be a monetary award in a civil suit. In the cases
of a few offenses that are included in this study that involve intentional injury or damage, the definition
of the prohibited conduct requires the intent or objective of the property damage or bodily injury to be
something other than the damage or injury itself.103 Similarly, while this study generally does not include
immigration offenses, it does include some offenses that are often associated with immigration violations,
such as identity theft, false statements, and certain employment practices.
The authors and their research teams used reasonable efforts to review every bill introduced in the
109th Congress that created or modified any criminal offense and then excluded those offenses that did not
fit the study’s selection criteria. Omissions and oversights are possible, but with very few exceptions,104 no
offenses that fit this study’s parameters were intentionally excluded. In all instances, the authors and their
researchers attempted to use the latest publicly available version of the bill, regardless of whether it was
enacted into law or at what stage of the legislative process it came to rest in its originating chamber when
the 109th Congress ended on January 3, 2007.

B. Counting the Studied Offenses
The term “offense,” as used in this study, is defined in a specific manner that requires some elaboration.
Unlike other studies that identify and count “crimes” or “offenses” based solely on the covered conduct and
the statute’s structure, this study also accounts for the mens rea requirements in the statutory language when
determining what constitutes an “offense” for counting purposes. This method is consistent with the study’s
main purpose, which is to examine the independent protectiveness of each offense’s mens rea requirement.
A criminal provision that includes only one mental state requirement applied to only one course of
conduct is counted as one “offense.” However, where a criminal provision includes more than one course
of conduct, the number of offenses within that provision is determined by analyzing the application of
the mental state requirement to each course of conduct. Thus, where the application of the mental state
requirement to two different courses of conduct is analytically distinct, each course of conduct counts as

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

33

a separate offense. Similarly, multiple subsections of the same criminal provision are counted as separate
offenses if the application of the mental state requirement to the conduct proscribed by the subsections is
analytically distinct. As the term “offense” is used throughout this report, it takes on the definition specific
to this method of counting offenses.105 Comparisons with any other study’s results should take into consideration the differences in counting methods and the definition of the term “offense.”

C. Offense Interpretation
This study’s primary focus is the independent protectiveness of each offense’s mens rea requirement. In
other words, the focus of the analysis was on the likelihood that the government could charge, prosecute,
and convict individuals who acted without intent to violate a law and lacked the knowledge that their conduct was unlawful or sufficiently wrongful to put them on notice of possible criminal responsibility. When
assessing each offense, the study does not rely on the ideal use of prosecutorial discretion, the existence of
which some rely on to defend laws that are vague or overbroad or lack meaningful mens rea requirements.
The idea that prosecutors will protect innocent individuals from unjust prosecution and punishment under
such laws has not always proven true, and even if it were true in 99 percent of cases, few would take comfort in knowing that laws sanction the conviction, in some cases, of those who are not culpable. Therefore,
this analysis does not take into account how an ideal prosecutor would, or would not, charge an offense
and does not assume that prosecutorial discretion will protect potential defendants from unjust conviction.
This is consistent with the purpose of the study, which is to assess the protections provided by the mens rea
requirements themselves.
In addition to plain language analysis, this study is guided by relatively recent Supreme Court decisions that define or interpret common mens rea terms used in federal statutes. Federal law does not include
standard, well-defined mens rea terms, such as those included in state criminal codes based on the American
Law Institute’s Model Penal Code (MPC). The use of mens rea terms in federal criminal law is haphazard,
and almost all of the terms have been subjected to a wide variety of (sometimes inconsistent) judicial interpretations.106 Recent Supreme Court opinions have provided guidance on the interpretation of the terms
“willfully” and “knowingly” when used as a blanket or introductory mens rea term.107
To the extent possible, this study is also guided by the Supreme Court’s Flores-Figueroa decision, as
amplified upon and qualified by Justice Alito’s concurring opinion, on the scope of the introductory
mens rea term (“knowingly”) in the federal aggravated identity theft statute.108 Specifically, where an offense includes a blanket or introductory mens rea term (usually “knowingly,” “willfully,” or both) and the
operative language of the offense follows directly and immediately after this term, this study’s analysis
generally applies the mens rea term to each non-jurisdictional element109 of the offense unless the statute’s grammar, context, or structure raises significant uncertainty about this approach. With regard to
those offenses where the application of the mens rea requirement is not entirely clear, or where the courts
are likely to reach differing conclusions, the authors have chosen not to apply the mens rea requirement
to those elements. Again, this is consistent with the purpose of the study: to determine the actual protection afforded by the mens rea requirement standing alone, and not to rely on the additional protections that might be afforded to defendants through an exemplary exercise of prosecutorial discretion
or through a particular court’s interpretation of a debatable provision of law. Further, this is consistent
with the principle that the protectiveness of the mens rea requirement in each offense should be analyzed
individually according to its unique terminology, grammar, and structure.
Finally, this study does not consider how an ideal court would rule on a motion to dismiss or whether the court would, for example, apply the common-law rule of lenity, or some other doctrine, to aid a

34

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particular defendant.110 Again, consistent with the purpose of this study, the focus is not on whether a court
might or could protect potential defendants from unjust conviction, but on the protections afforded by the
mens rea requirements themselves, independent of such considerations.

D. Categorizing the Offenses
1. The Four Mens Rea Categories
Each of the offenses included in this study was assigned one of four grades describing the protection
provided by the offense’s mens rea requirement.
a. Inadequate Mens Rea Requirements: “None” and “Weak”
•	 None: Nothing in the language of the offense prevents conviction of an individual who
–	 Did not intend to violate a law, and
–	 Did not have knowledge that his conduct was unlawful or sufficiently wrongful to put
him on notice of possible exposure to criminal responsibility.
The None category includes offenses that omit any mens rea requirement, which are usually
strict liability offenses, and those offenses that rely on tort-law terminology, such as “should
have known,” “reasonably should have known,” or “negligently,” rather than the criminal law’s
traditional mens rea terminology.
•	 Weak: The language of the offense is reasonably likely to prevent the conviction of at least some
individuals who
–	 Did not intend to violate a law, and
–	 Did not have knowledge that their conduct was unlawful or sufficiently wrongful to put
them on notice of possible exposure to criminal responsibility.
At the same time, the language of an offense characterized as Weak could, without being misinterpreted, allow the conviction of a sizable number of these individuals.
The Weak category includes most offenses that use the terms “knowingly” or “intentionally” in
a blanket manner or as part of the introductory language of the offense, without any additional
mens rea terminology.
In light of these definitions of None and Weak, this study considers the mens rea requirements of
offenses falling into either of these two categories to be inadequate.
b. Adequate Mens Rea Requirements: “Moderate” and “Strong”
•	 Moderate: The language of the offense is more likely than not to prevent the conviction of an
individual who
–	 Did not intend to violate a law, and
–	 Did not have knowledge that his conduct was unlawful or sufficiently wrongful to put
him on notice of possible exposure to criminal responsibility.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

35

Nonetheless, some of these individuals could be convicted of an offense graded as Moderate
without engaging in substantial misinterpretation of its language because of inconsistent judicial
interpretation and application of the mens rea terms it uses.
The Moderate category includes most offenses that use the terms “willfully” or “knowingly and
willfully” (or “willfully and knowingly”) in a blanket manner as part of their introductory language, without any additional mens rea terminology. It also includes some offenses that apply a
variation of the phrase “with knowledge” to conduct involving making or using false statements
or writings.
•	 Strong: The language of the offense, absent substantial misinterpretation, is highly unlikely to
permit the conviction of an individual who
–	 Did not intend to violate a law, and
–	 Did not have knowledge that his conduct was unlawful or sufficiently wrongful to put
him on notice of possible exposure to criminal responsibility.
This category includes, for example, offenses that use some combination of the mens rea terms
“knowingly” and “willfully” with a specific intent to violate the law or to act in a manner that the
average person knows to be inherently wrongful or in violation of the law.
Although the mens rea requirements of offenses categorized as Moderate (and especially those categorized as Weak‑to‑Moderate yet tallied as Moderate) are not ideal and would allow for criminal
conviction and punishment of some inculpable persons, this study considers the mens rea requirements of offenses falling into both the Strong and Moderate categories to be adequate.
The preceding definitions state the basic guidelines for grading the studied offenses, but this study analyzed each offense’s mens rea requirement individually and within the context of the rest of the offense’s
structure and language. As part of the analysis and in addition to being assigned a grade, important parts of
the individual assessment were recorded in the tables included in this report’s online appendix. These tables
include a basic explanation of the strengths and weaknesses of each offense’s mens rea requirement and a
discussion of any offense-specific or other unusual considerations that affected an offense’s grade.

2. Tabulating Intermediate Mens Rea Grades
In some instances, an offense could not be placed squarely into one of the four mens rea categories.
Where the authors agreed that the protectiveness of an offense’s mens rea requirement fell between two categories, it was given an intermediate grade, such as None-to-Weak. Offenses receiving one of these intermediate grades are indicated as such in the online appendix to this report. However, in order to give the benefit
of the doubt to congressional drafting, these offenses were assigned the higher, more protective grade for
this report’s other analyses. For example, an offense graded as Weak-to-Moderate in the online appendix is
tabulated simply as Moderate for the purposes of this study’s data reporting and statistical analyses.

E. Congressional Actions
In addition to grading each offense’s mens rea requirement, the study also determined whether any
of seven major congressional actions were taken on each bill that contained a studied offense. Of these

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seven actions, three concern chamber-wide activities: (1) whether a bill was referred to the House or Senate Judiciary Committee; (2) whether a bill was passed by either the House or Senate; and (3) whether a
bill was ultimately enacted into law. If the bill was referred to a House or Senate Judiciary Committee, the
study tracked whether the committee (or one of its subcommittees, as possible) held a hearing on the bill,
amended the bill, marked up the bill, or reported the bill for consideration by the full chamber.

F. Statistical Analysis of Possible Correlations Between Congressional
Actions and Protectiveness of Mens Rea Requirements
The Heritage Foundation’s Center for Data Analysis conducted several types of statistical calculations
to identify where the legislative process might be improving or undermining the mens rea requirements of
non-violent criminal offenses. The statistical calculations looked for correlations between the protectiveness of mens rea requirements and the cataloged actions—specifically, whether the bill was enacted, passed
by a chamber, referred to a judiciary committee, or subjected to other major actions by a judiciary committee. The results of CDA’s calculations are included in the online appendix.

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

37

38

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Endnotes

1. This report and the underlying study on which it is based use the terms mens rea and “guilty mind.” Neither
finds its perfect synonym in the term “criminal intent,” which is employed in the report’s title solely for its wider usage
in the media and public discourse.
2. This report uses the term “non-violent offenses” as a shorthand for these offenses. Whereas all the offenses
included in this study are non-violent, many other offenses proposed by the 109th Congress could also be described as
non-violent. Specifically, this study did not include offenses that involve firearms, drugs and drug trafficking, pornography, and immigration violations. This report’s use of the term “non-violent offenses” is merely a shorthand description
and is not intended as a statement that the excluded offenses are necessarily violent in nature.
3. As explained more fully later in the report, this study considered a criminal offense’s mens rea requirement to be
adequate if the language of the offense itself provides sufficient protection from criminal punishment to individuals
who act without intent to violate a law and without knowledge that their conduct was unlawful or sufficiently wrongful to put them on notice of possible criminal liability. See Methodological Appendix, infra.
4. Sequential referral is the practice of sending a bill to multiple congressional committees in an ordered sequence.
The first committee in the ordered sequence has exclusive control over the bill until it either reports the bill out or its
time for consideration expires, at which point the bill moves on to the second committee in the same manner.
5. See, e.g., John S. Baker, Jr., Revisiting the Explosive Growth of Federal Crimes, Heritage Foundation L. Memo. No.
26, June 16, 2008, at 1 (finding that from 2000 through 2007 Congress enacted an average of 56.5 crimes a year).
6. Herbert Wechsler, The Challenge of a Model Penal Code, 65 Harv. L. Rev. 1097, 1098 (1952).
7. Bouie v. City of Columbia, 378 U.S. 347, 351 (1964) (internal quotation marks omitted) (quoting Lanzetta v. New
Jersey, 306 U.S. 451, 453 (1939)).
8. Id. at 350.
9. Morissette v. United States, 342 U.S. 246, 251–52 (1952).
10. See Rollin M. Perkins, A Rationale of Mens Rea, 52 Harv. L. Rev. 905, 908 (1939).
11. See Paul H. Robinson, A Brief History of Distinctions in Criminal Culpability, 31 Hastings L.J. 815, 821–46 (1980)
(discussing, inter alia, the development in the 13th century English courts of the legal doctrine that a criminal defendant
could be convicted only upon proof that he acted with a guilty mind).
12. Dennis v. United States, 341 U.S. 494, 500 (1951).
13. Morissette, 342 U.S. at 251.
14. As described later in the report, the President of the United States and others in the executive branch play a
substantial role in the proliferation of criminal offenses with inadequate mens rea requirements.
15. Where the prohibition of certain conduct is justified, civil rather than criminal enforcement is often the most
effective method for regulating and punishing that conduct. Civil enforcement does not inflict the stigma of criminal
punishment on inadvertent violators and those who are insufficiently blameworthy, and it still effectuates deterrence,
retribution, and rehabilitation through the use of fines and other penalties. See Marie Gryphon, It’s a Crime?: Flaws in
Federal Statutes That Punish Standard Business Practice, Manhattan Inst. Civil Justice Report No. 12, at 10 (Nov. 2009).
16. 1 J. Austin, Lectures on Jurisprudence, 497 (Robert Campbell ed., Gaunt, Inc. 4th ed. 1976) (1879); see also 4
William Blackstone, Commentaries 27 (William S. Hein & Co. 1992) (1769) (“[E]very person of discretion…is bound
and presumed to know [the law].”).

How Congress Is Eroding the Criminal Intent Requirement in Federal Law

39

17. Joshua Dressler, Understanding Criminal Law 166 (3d ed. 2001) (emphasis added, internal citation omitted).
18. See generally Baker, supra note 5; Criminal Justice Section, American Bar Association, The Federalization of
Criminal Law (1998) [hereinafter Federalization of Criminal Law].
19. Erik Luna, The Overcriminalization Phenomenon, 54 Am. U. L. Rev. 703, 713–14 (2005).
20. 18 U.S.C. § 1112 (2008).
21. See Black’s Law Dictionary 957 (6th ed. 1991) (defining “malice aforethought” as an “intent, at the time of a
killing, willfully to take the life of a human being, or an intent willfully to act in callous and wanton disregard of the
consequences to human life”).
22. 18 U.S.C. § 1111(a) (2008).
23. Id.
24. In his dissent from denial of certiorari in Sorich v. United States, Justice Antonin Scalia noted that one federal
court of appeals “confidently proclaimed” that the vague, overbroad federal honest services fraud statute, 18 U.S.C.
§ 1346, is “‘not violated by every breach of contract, breach of duty, conflict of interest, or misstatement made in the
course of dealing.’” 129 S. Ct. 1308, 1310 (2009) (Scalia, J., dissenting from denial of certiorari) (quoting United States v.
Welch, 327 F.3d 1081, 1107 (10th Cir. 2003)). In expressing his skepticism about the appeals court’s proclamation, Justice
Scalia argued that such an overbroad law could be unjustly applied to make virtually any unseemly conduct a crime:
Without some coherent limiting principle to define what “the intangible right of honest services” is,
whence it derives, and how it is violated, this expansive phrase invites abuse by headline grabbing prosecutors in pursuit of local officials, state legislators, and corporate CEOs who engage in any manner
of unappealing or ethically questionable conduct.
Id.; see also 2 St. Thomas Aquinas, Summa Theologica pt. I-II, q. 96, art. 2, at 1018 (Fathers of the English Dominican
Province trans., Christian Classics 1981) (1948) (“[H]uman laws do not forbid all vices, from which the virtuous abstain,
but only the more grievous vices, from which it is possible for the majority to abstain; and chiefly those that are to the
hurt of others, without the prohibition of which human society could not be maintained: thus human law prohibits
murder, theft and such like.”).
25. Lanzetta v. New Jersey, 306 U.S. 457, 453 (1939).
26. See generally Baker, supra note 5; Federalization of Criminal Law, supra note 18.
27. See Rachel Brand, Making It a Federal Case: An Inside View of the Pressures to Federalize Crime, Heritage Found.
L. Memo. No. 30, Aug. 29, 2008, at 2–4 (describing political, media, and public pressure to fashion new federal criminal
laws or increase federal law enforcement authority in response to problems that garner nationwide attention).
28. See Federalization of Criminal Law, supra note 18, at 2.
29. See generally Baker, supra note 5; Federalization of Criminal Law, supra note 18; Ronald L. Gainer, Federal Criminal
Code Reform: Past and Future, 2 Buff. Crim. L. Rev. 46 (1998); Ronald L. Gainer, Report to the Attorney General on Federal
Criminal Code Reform, 1 Crim. L. Forum 99 (1989).
30. “While a figure of ‘approximately 3,000 federal crimes’ is frequently cited, that helpful estimate is now surely
outdated by the large number of new federal crimes enacted in the 16…or so years intervening since its estimation. The
present number of federal crimes is unquestionably larger.” Federalization of Criminal Law, supra note 18, at 94.
31. Id. at 7–8.
32. Id. at 93.
33. Id. at 10.
34. Id. at 10 n.13.
35. The Baker study used a methodology based closely on that used by the Justice Department, which was the
basis of the ABA Report’s 3,000 federal crimes estimate. Baker, supra note 5, at 5.
36. Id. at 1–2.
37. Id. at 2.
38. See id. (finding that from 2000 through 2007 Congress created an average of 56.5 entirely new crimes a year).
39. Morissette v. United States, 342 U.S. 246, 251 (1952).

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40. See, e.g., 18 U.S.C. § 707 (providing a criminal penalty of up to six months imprisonment for making unauthorized use of the logo of the 4-H Clubs).
41. 18 U.S.C. §§ 1341, 1343 (2008).
42. See Black v. United States, 530 F.3d 596 (7th Cir. 2008), cert. granted, 129 S. Ct. 2379 (U.S. 2009); Weyhrauch v.
United States, 548 F.3d 1237 (9th Cir. 2008), cert. granted, 129 S. Ct. 2863 (U.S. 2009); Skilling v. United States, 554 F.3d
529 (5th Cir. 2009), cert. granted, 130 S. Ct. 393 (U.S. 2009); see also Brief of the National Association of Criminal Defense
Lawyers as Amici Curiae in Support of Petitioner, Skilling v. United States, No. 08-1394 (U.S. Dec. 18, 2009); Brief of the
National Association of Criminal Defense Lawyers as Amici Curiae in Support of Petitioner, Weyhrauch v. United States,
No. 08-1196 (U.S. Sep. 21, 2009); Brief of the National Association of Criminal Defense Lawyers and New York Council
of Defense Lawyers as Amici Curiae in Support of Petitioners, Black v. United States, No. 08-876 (U.S. Aug. 6, 2009).
43. S. 2509, 109th Cong. § 1713(b) (2006).
44. Id.
45. See 18 U.S.C. § 1033(f )(1) (“[T]he term ‘business of insurance’ means (A) the writing of insurance, or (B) the reinsuring of risks, by an insurer, including all acts necessary or incidental to such writing or reinsuring and the activities
of persons who act as, or are, officers, directors, agents, or employees of insurers or who are other persons authorized
to act on behalf of such persons[.]”).
46. Flores-Figueroa v. United States, 129 S. Ct. 1886 (2009).
47. 18 U.S.C. § 1028A(a)(1).
48. Flores-Figueroa, 129 S. Ct. at 1888.
49. Id. at 1894.
50. Id. at 1890.
51. Id. at 1891.
52. Id. at 1895 (Alito, J., concurring).
53. Id. at 1895–96. As Justice Alito explained:
For example, 18 U.S.C. § 2423(a) makes it unlawful to “knowingly transpor[t] an individual who has
not attained the age of 18 years in interstate or foreign commerce…with intent that the individual
engage in prostitution, or in any sexual activity for which any person can be charged with a criminal
offense.” The Courts of Appeals have uniformly held that a defendant need not know the victim’s age
to be guilty under this statute…. Similarly, 8 U.S.C. § 1327 makes it unlawful to “knowingly ai[d] or
assis[t] any alien inadmissible under section 1182(a)(2) (insofar as an alien inadmissible under such section has been convicted of an aggravated felony)…to enter the United States.” The Courts of Appeals
have held that the term “knowingly” in this context does not require the defendant to know that the
alien had been convicted of an aggravated felony.
Flores-Figueroa, 129 S. Ct. at 1895–96 (alterations in original, internal citations omitted).
54. Id. at 1896.
55. Id. at 1891 (majority opinion).
56. For example, one provision in the federal Lacey Act states that any person who “knowingly imports or exports
any fish or wildlife or plants in violation of any provision of this chapter” shall be criminally punished. See 16 U.S.C.
§ 3373(d)(1)(A). Another provision of the Lacey Act incorporates every wildlife rule or offense present in “any law,
treaty, or regulation of the United States or…any Indian tribal law.” 16 U.S.C. § 3372(a)(1).
57. John C. Coffee, Jr., Does “Unlawful” Mean “Criminal”?: Reflections on the Disappearing Tort/Crime Distinction in
American Law, 71 B.U. L. Rev. 193, 216 (1991); see also Clyde Wayne Crews, Jr., Ten Thousand Commandments: An Annual
Snapshot of the Federal Regulatory State, Competitive Enter. Inst. 13 (2007), available at http://cei.org/pdf/6018.pdf
(“Since 1980, the CFR [Code of Federal Regulations] has grown from 102,195 pages to 144,040. By contrast, in 1960,
there were only 22,877 pages.”).
58. H.R. 3968, 109th Cong. § 506(g)(2) (2005).
59. 16 U.S.C. § 3371 et seq.

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60. See, e.g., Marie Gryphon, It’s a Crime?: Flaws in Federal Statutes That Punish Standard Business Practice, Manhattan Institute Civil Justice Report No. 12, at 2–6 (Nov. 2009) (explaining how missing or inadequate mens rea
requirements in federal criminal law undermine the principle that to be punished criminally a person must be truly
blameworthy); Harvey A. Silverglate, Federal Criminal Law: Punishing Benign Intentions—A Betrayal of Professor Hart’s
Admonition to Prosecute Only the Blameworthy, in In the Name of Justice 65 (Timothy Lynch ed., 2009). Silverglate’s essay in response to Professor Henry Hart’s classic article on The Aims of the Criminal Law, 410 Law & Contemp. Probs.
25 (1958), briefly reviews the path that federal criminal law has followed since a few U.S. Supreme Court precedents
undermined common-law protections requiring criminal punishment to be based on actual blameworthiness. Id.
at 66–73. Silverglate’s essay also reviews several federal criminal prosecutions that were based on vague, overbroad
criminal offenses lacking adequate mens rea requirements and similar protections necessary to protect defendants who
are not truly blameworthy. Id. at 73–94. The development of criminal law in the 50 states has generally followed a different path. Silverglate points out that “efforts to codify state criminal codes in the 1950s and 1960s were intended to
modernize and organize—not to reject—ancient common law concepts, firmly establishing their place in the statute
books.” Id. at 67. When considering mens rea and related concepts, “the crafters of the new state criminal statutes were
attuned to the need to keep the law linked to the moral notions of blameworthiness that underpinned the common
law of crimes.” Id.
61. The rule of lenity is a judicial doctrine used to construe ambiguous criminal laws. See United States v. Santos,
128 S. Ct. 2020, 2025 (2008). In such cases, the rule requires the court to resolve the ambiguity in the defendant’s favor.
See id.
62. These numbers include only bills, not resolutions.
63. H.R. 3192, 109th Cong. § 107(1) (2005).
64. S. 3506, 109th Cong. § 2(c) (2006).
65. As amended by the Stolen Valor Act of 2005, Pub. L. No. 109-437, § 3, 120 Stat. 3266 (2006) (hereinafter Stolen
Valor Act) (S. 1998, 109th Cong.), 18 U.S.C. § 704(a) now reads: “Whoever knowingly wears, purchases, attempts to
purchase, solicits for purchase, mails, ships, imports, exports, produces blank certificates of receipt for, manufactures,
sells, attempts to sell, advertises for sale, trades, barters, or exchanges for anything of value any decoration or medal
authorized by Congress for the armed forces of the United States, or any of the service medals or badges awarded to
the members of such forces, or the ribbon, button, or rosette of any such badge, decoration or medal, or any colorable
imitation thereof, except when authorized under regulations made pursuant to law, shall be fined under this title or
imprisoned not more than six months, or both.”
66. Stolen Valor Act, supra note 65 § 1.
67. See Orders and Medals Society of America, OMSA President’s Message, March-April 2007, http://www.omsa.org/
forums/president.php (“Although the intent of the [l]aw was to restrict and provide severe consequences to those individuals who fraudulently claimed that they were recipients of the Medal of Honor, Distinguished Service Cross, Navy
Cross, Air Force Cross, Silver Star and Purple Heart, the actual wording left much to be desired. In fact the law appears
to restrict all commerce in the above decorations and[,] depending on how it is interpreted[,] possibly all U.S. Federal
awards.”).
68. Dixon v. United States, 126 S. Ct. 2437, 2441 (2006) (quoting Bryan v. United States, 524 U.S. 184, 193 (1998)).
69. 524 U.S. at 192. In some federal circuits, any mens rea requirement based on knowledge (e.g., “knowingly,”
“knowing,” or “knew”) is likely to draw a government request for a jury instruction on willful blindness. See, e.g., United
States v. Jewell, 532 F.2d 697, 700–04 (9th Cir. 1976) (en banc) (holding that a jury may convict under a “knowingly”
standard if it finds the evidence satisfies a liberal formulation of the “willful blindness” or “deliberate ignorance” doctrine). Any “willful blindness” instruction that follows, for instance, the Jewel line of cases is likely to be inferior to and
less protective than the formulation of the doctrine in the American Law Institute’s Model Penal Code. See Model Penal
Code § 2.02(7) (2009) (“Requirement of Knowledge Satisfied by Knowledge of High Probability.”).
70. H.R. 3968, 109th Cong. § 506(g)(2) (2005).
71. Bryan, 524 U.S. at 192.
72. H.R. 3968, 109th Cong. § 506(g)(2).
73. Id.

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74. See Dixon v. United States, 548 U.S. 1, 6–7 (2006) (“[U]nless the text of the statute dictates a different result,
the term ‘knowingly’ merely requires proof of knowledge of the facts that constitute the offense.” (internal quotation
marks omitted)); Bryan v. United States, 524 U.S. 184, 192 (1998) (“[T]he term ‘knowingly’ does not necessarily have any
reference to a culpable state of mind or to knowledge of the law. As Justice Jackson correctly observed, ‘the knowledge
requisite to knowing violation of a statute is factual knowledge as distinguished from knowledge of the law.’” (quoting
Boyce Motor Lines v. United States, 342 U.S. 337, 345 (1952) ( Jackson, J., dissenting))).
75. H.R. 4148, 109th Cong. § 2(a) (2005).
76. Although this report’s analysis focuses on the mens rea requirement of the criminal provision, and not the
actus reus, it should be taken into consideration when assessing the strength of the offense’s mens rea provision that the
conduct constituting this particular offense is quite broad, vague, and far-reaching. When considering the practical
application of such an offense, the conduct proscribed by an overbroad actus reus can undermine the protection
afforded by the mens rea provision.
77. As the U.S. Supreme Court noted in Bryan v. United States, the “word ‘willfully’ is sometimes said to be ‘a word
of many meanings’ whose construction is often dependent on the context in which it appears. Most obviously it differentiates between deliberate and unwitting conduct, but in the criminal law it also typically refers to a culpable state of
mind. As we [have] explained…, a variety of phrases have been used to describe that concept.” 524 U.S. 184, 191 (1998)
(internal citations omitted). Further, “[t]he word often denotes an act which is intentional, or knowing, or voluntary, as
distinguished from accidental. But when used in a criminal statute it generally means an act done with a bad purpose;
without justifiable excuse; stubbornly, obstinately, perversely. The word is also employed to characterize a thing done
without ground for believing it is lawful or conduct marked by careless disregard whether or not one has the right so
to act.” Id. at 191 n.12 (internal citations omitted); see also id. at 191–92 (“As a general matter, when used in the criminal
context, a ‘willful’ act is one undertaken with a ‘bad purpose.’”). However, the Court has held that in “certain cases
involving willful violations of the tax laws…the jury must find that the defendant was aware of the specific provision
of the tax code that he was charged with violating.” Id. at 194 (citing Cheek v. United States, 498 U.S. 192, 201 (1991)).
In Ratzlaf v. United States, 510 U.S. 135 (1994), for example, the Court concluded that “in order to satisfy a willful violation…the jury had to find that the defendant knew that his structuring of cash transactions to avoid a reporting requirement was unlawful.” Bryan, 524 U.S. at 194. The Court reasoned that “[b]oth the tax cases and Ratzlaf involved highly
technical statutes that presented the danger of ensnaring individuals engaged in apparently innocent conduct.” Id. at
194 (citing Ratzlaf, 510 U.S. at 149). For purposes of analysis, this report relies on the Supreme Court’s discussion of
the term “willfully” in Bryan, in particular, the Court’s statements defining “willfully” to require a “culpable state of
mind,” an act “undertaken with a ‘bad purpose,’” or both. Unless the context dictates otherwise, the analysis does not
interpret “willfully” as requiring a defendant’s specific knowledge of the law or his intent to violate a specific provision
of law. This approach steers a course somewhere near the middle of the way through the varied definitions and usages
of “willfully” in a significant body of Supreme Court case law.
78. H.R. 4572, 109th Cong. § 5 (2005).
79. H.R. 5188, 109th Cong. § 2(a) (2006).
80. S. 414, 109th Cong. § 303 (2005).
81. U.S. Senate Committee on the Judiciary, http://judiciary.senate.gov/about/ (last visited Feb. 4, 2010). For similar information about the House Judiciary Committee, see http://judiciary.house.gov.
82. U.S. Senate Rule XXV, available at http://rules.senate.gov/public/index.cfm?FuseAction=HowCongressWorks.
RulesOfSenate.
83. The authors did not overlook the possibility that greater judiciary committee oversight might correlate with
less protective mens rea requirements. Federal law enforcement agencies, including the U.S. Department of Justice, routinely provide some of their employees the opportunity to serve “on detail” as staff to Members of Congress and congressional committees. Anecdotal reports indicate that a substantial percentage of these detailees work for the House
and Senate Judiciary Committees and for Members of Congress who serve on those committees and that detailees not
infrequently become permanent members of congressional staff. While they serve as congressional staff, law enforcement detailees remain employees of their respective law enforcement agencies. The possibility has been recognized
that detailees could exert an institutional bias on the legislative process in favor of broader, harsher criminal offenses
under which it is easier to secure a conviction.

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84. Future studies might consider whether any of the following factors correlates with the strength of mens rea
requirements in non-violent offenses: the identity of each bill’s primary sponsor or sponsors, the length of sponsors’
tenure in Congress, and the length of sponsors’ tenure (if any) as a member of a judiciary committee.
85. The term “the offense” is in quotation marks in the text because statutes directing regulatory criminalization
are not proper criminal offenses. Such statutes do not define the entire actus reus, and they usually do not define the
entire mens rea requirement or provide the specificity and definiteness of language needed to direct how any mens rea
requirement should be applied to the elements of the offense as ultimately defined by regulatory action.
86. Over-Criminalization of Conduct/Over-Federalization of Criminal Law: Hearing Before the Subcomm. on Crime, Terrorism, and Homeland Security of the H. Comm. on the Judiciary, 109th Cong. (2009) [hereinafter House Hearing] (written statement of former U.S. Att’y Gen. Dick Thornburgh, July 22, 2009, at 9), available at http://judiciary.house.gov/hearings/
pdf/Thornburgh090722.pdf, 2009 WL 2186682 (“Congress needs to rein in the continuing proliferation of criminal
regulatory offenses. Regulatory agencies routinely promulgate rules that impose criminal penalties that are not enacted
by Congress…. Congress should not delegate such an important function to agencies.”); see also id. (recommending
reform similar to that proposed by the Congressional Responsibility Act, H.R. 931, 109th Cong. (2005), which “sought
to ensure that Federal regulations would not take effect unless passed by a majority of the members of the Senate and
House and signed by the President”).
87. Columbia law professor John Coffee has reported estimates that up to 300,000 federal regulations can be
punished criminally. John C. Coffee, Jr., Does “Unlawful” Mean “Criminal”?: Reflections on the Disappearing Tort/Crime
Distinction in American Law, 71 B.U. L. Rev. 193, 216 (1991).
88. Since the beginning of 2007, the Heritage Foundation has been using the Legislative Update system that
it developed in conjunction with the National Association of Criminal Defense Lawyers to monitor and perform
basic analysis of every criminal offense introduced in Congress that meets the same criteria as the offenses that are
the subject of this study. The Legislative Update is publicly available on Heritage’s Overcriminalized.com Web site.
See Overcriminalized.com, http://overcriminalized.com/Legislation.aspx. When Congress is in session, Heritage’s
weekly Legislative Update Alert provides email subscribers status updates and a brief summary of newly introduced
and pending bills that would add non-violent criminal offenses to federal law or modify those already in law. The
analysis conducted for the Legislative Update Alert strongly suggests that the data in this report on the number,
type, and mens rea requirements of criminal offenses introduced and passed in the 109th Congress are generally
consistent with the number, type, and mens rea requirements of criminal offenses introduced and passed in the 110th
Congress.
89. But see House Hearing, supra note 86 (statement of Chairman Robert “Bobby” Scott), video available at http://
judiciary.edgeboss.net/real/judiciary/crime/crime072309.smi (noting widespread concern over the deterioration in
the standards for what constitutes a criminal offense, including “the disappearance of the common-law requirement of
mens rea,” and emphasizing that “mens rea has long played an important role in protecting those who do not intend to
commit wrongful acts from prosecution and conviction”); id. (statement of Ranking Member Louie Gohmert) (noting
that, in the “labyrinth” of criminal laws scattered throughout the U.S. Code and federal regulations, there is “a significant element missing from many of the criminal provisions: criminal intent” and explaining that the mens rea requirement is “a cornerstone of criminal law, and it is eroding as regulatory crimes are being prosecuted under reduced, or
even non-existent, mental states”).
90. Similarly, the Legislative Update system attempts to identify every amendment that contains relevant criminal
provisions and to include such amendments in the weekly Legislative Update Alert emails. It is not unusual for this
process to identify amendments with criminal provisions being added to bills approximately a week before the bill is
passed, leaving too little time for adequate review of the criminal provision by Members and almost no time for the
public to be apprised of the new criminalization before it is passed.
91. Baker, supra note 5, at 1, 5.
92. See supra notes 46–55 and accompanying text.
93. 18 U.S.C. § 1346 (2000).
94. See supra note 42 and accompanying text.
95. In doing so, some consideration should be given to the key provisions in the American Law Institute’s Model
Penal Code (MPC) that standardize how courts interpret criminal statutes that have no or unclear mens rea requirements.

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See Model Penal Code § 2.02(1) (2009) (“Minimum Requirements of Culpability”); id. § 2.02(3) (“Culpability Required
Unless Otherwise Provided”); id. § 2.02(4) (“Prescribed Culpability Requirement Applies to All Material Elements”).
Although the general rule articulated in MPC subsection 2.02(3) is salutary insofar as it provides an express remedy
for an omission of mens rea terminology, “recklessly” should not be used as a default term because it is insufficient to
protect those actors who are not truly culpable or blameworthy. See id. § 2.02(3) (“When the culpability sufficient to
establish a material element of an offense is not prescribed by law, such element is established if a person acts purposely,
knowingly, or recklessly with respect thereto.”). In order to avoid unjust convictions, it is strongly recommended that
any default mens rea provision enacted into federal law rely on the mens rea terms that are most protective of persons
who are not truly blameworthy.
96. Id. § 2.02(4) (“When the law defining an offense prescribes the kind of culpability that is sufficient for the commission of an offense, without distinguishing among the material elements thereof, such provision shall apply to all the
material elements of the offense, unless a contrary purpose plainly appears.”).
97. See, e.g., United States v. Santos, 128 S. Ct. 2020, 2025 (2008).
98. Id.
99. See Taylor v. Kentucky, 436 U.S. 478, 483–87 (1978) (explaining the presumption of innocence and the government’s burden of demonstrating the defendant’s guilt beyond a reasonable doubt); Estelle v. Williams, 425 U.S. 501, 503
(1976) (“The presumption of innocence…is a basic component of a fair trial under our system of criminal justice.”).
100. In United States v. Bass, the Supreme Court referred to the rule of lenity as a “wise principle[ ] this court has
long followed.” 404 U.S. 336, 347 (1971). Quoting Justice Oliver Wendell Holmes, Jr., and Judge Henry Friendly, respectively, the Court further explained:
This principle is founded on two policies that have long been part of our tradition. First, “a fair warning should be given to the world in language that the common world will understand, of what the law
intends to do if a certain line is passed. To make the warning fair, so far as possible the line should be
clear.”… Second, because of the seriousness of criminal penalties, and because criminal punishment
usually represents the moral condemnation of the community, legislatures and not courts should define criminal activity. This policy embodies “the instinctive distaste against men languishing in prison
unless the lawmaker has clearly said they should.”
Id. at 348 (internal citations omitted); see also Bell v. United States, 349 U.S. 81, 83 (1955) (“When Congress leaves to the
Judiciary the task of imputing to Congress an undeclared will, the ambiguity should be resolved in favor of lenity. And
this is not out of any sentimental consideration, or for want of sympathy with the purpose of Congress in proscribing
evil or antisocial conduct. It may fairly be said to be a presupposition of our law to resolve doubts in the enforcement
of a penal code against the imposition of a harsher punishment.”).
101. Wayne R. LaFave, Criminal Law 11 (4th ed. 2003).
102. It would be of great benefit to the nation, and little would be lost, if Congress were to place a non-partisan,
across-the-board moratorium on enacting new criminal offenses for at least one year and invest the legislative time and
resources that are now being squandered on creating new criminal offenses into studying existing federal criminal offenses and rewriting the currently monstrous, disorganized, and incomprehensible body of federal criminal law. Cf. Julie
R. O’Sullivan, The Federal Criminal “Code” Is a Disgrace: Obstruction Statutes as Case Study, 96 J. Crim. L. & Criminology
643, 643 (2006) (characterizing federal criminal law as “an ‘incomprehensible,’ random and incoherent, ‘duplicative,
ambiguous, incomplete, and organizationally nonsensical’ mass of federal legislation that carries criminal penalties”
(internal citations omitted)).
103. One example of such an offense is found in section 303 of the Voter Protection Act, S. 414, 109th Cong.
(2005), which criminalizes damage to property if the offender intended thereby to prevent a person from voting in an
election for national office. See supra note 80 and accompanying text.
104. The only known exceptions that fit this study’s criteria are the bills in the 109th Congress criminalizing cloning and conduct related to cloning, which were removed because the authors were unable to reach agreement on the
nature of these offenses’ mens rea provisions.
105. The reader is referred to the online appendix to this report, available at http://report.heritage.org/sr0077 and
www.nacdl.org/withoutintent. Each individual offense defined in this study has its own table in the Offenses Appendix
in the Online Appendix.

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106. See, e.g., Dixon v. United States, 548 U.S. 1 (2006); Bryan v. United States, 524 U.S. 184 (1998); Ratzlaf v. United
States, 510 U.S. 135 (1994).
107. See, e.g., Dixon, 548 U.S. at 6–7; Bryan, 524 U.S. at 193; Ratzlaf, 510 U.S. at 141.
108. Flores-Figueroa v. United States, 129 S. Ct. 1886, 1888 (2009) (holding that the mens rea term “knowingly” in
the introductory language of the federal aggravated identity theft statute (18 U.S.C. § 1028A(a)(1)) applies to the phrase
“of another person” located at the end of the offense’s definition). For a more complete discussion of the Supreme
Court’s decision in Flores-Figueroa, see supra notes 46–55 and accompanying text.
109. Because the federal government is a body of limited, enumerated powers, a high percentage of the nonviolent offenses in this study require (or purport to require) a nexus between the violative conduct and interstate
commerce. The purpose of language requiring this nexus is to bring the conduct under the power granted to Congress under the Commerce Clause of the U.S. Constitution. Some offenses, for example, require the conduct to be “in
or affecting interstate commerce,” an extremely broad jurisdictional “hook,” which ostensibly makes the prohibited
conduct a matter of federal jurisdiction. Where a single mens rea term (usually “knowingly” or “willfully”) is used as a
blanket or introductory requirement at the beginning of the language defining the offense, this study generally does
not assume that the federal courts will require the government to prove that the defendant knew that his conduct was,
for example, “in or affecting interstate commerce” in order to secure a conviction.
110. The rule of lenity is a judicial doctrine used to construe ambiguous criminal laws. See United States v. Santos,
128 S. Ct. 2020, 2025 (2008). In such cases, the rule requires the court to resolve the ambiguity in the defendant’s favor.
For a discussion of the rule of lenity, see supra notes 97–101 and accompanying text.

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Online Appendix available at:

http://report.heritage.org/sr0077
and

www.nacdl.org/withoutintent

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