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Growing Evidence About the Effects of Gun Policies Provides Needed Information for Policy Decisions
Apr 21, 2020
The Science of Gun Policy
A Critical Synthesis of Research Evidence on the Effects of Gun Policies in the United States, Second Edition
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Research Questions
- What does the scientific evidence say about the effects of various firearm policies on societally important outcomes?
- What steps might policymakers and other stakeholders take to improve the scientific evidence base on how gun policies affect outcomes?
In this report, part of the RAND Corporation's Gun Policy in America initiative, researchers seek objective information about what the scientific literature reveals about the likely effects of various gun laws. In this second edition of an earlier work, the authors add five gun policies to the 13 examined in the original analysis and expand the study time frame to incorporate a larger body of research. With those adjustments, the authors synthesize the available scientific data on the effects of 18 policies on firearm deaths, violent crime, the gun industry, defensive gun use, and other outcomes. By highlighting where scientific evidence is accumulating, the authors hope to build consensus around a shared set of facts that have been established through a transparent, nonpartisan, and impartial review process. In so doing, they also illuminate areas where more and better information could make important contributions to establishing fair and effective gun policies.
Key Findings
Scientific evidence on gun policies' effects is modest but supports a few conclusions
- Of more than 200 combinations of policies and outcomes, surprisingly few have been the subject of methodologically rigorous investigation. Notably, research into five of the examined outcomes is either unavailable or almost entirely inconclusive, and three of these five outcomes represent issues of particular concern to gun owners or gun industry stakeholders.
- Available evidence supports the conclusion that child-access prevention laws, or safe storage laws, reduce self-inflicted fatal or nonfatal firearm injuries, including unintentional and intentional self-injuries, among youth.
- There is supportive evidence that stand-your-ground laws are associated with increases in firearm homicides and moderate evidence that they increase the total number of homicides.
- There is moderate evidence that state laws prohibiting gun ownership by individuals subject to domestic violence restraining orders decrease total and firearm-related intimate partner homicides.
- There is moderate evidence that waiting periods reduce firearm suicides and total homicides and limited evidence that they reduce total suicides and firearm homicides.
- No studies meeting the authors' inclusion criteria have examined the effects of gun-free zones, laws allowing armed staff in kindergarten through grade 12 schools, or required reporting of lost or stolen firearms.
Recommendations
- States without child-access prevention laws should consider adopting them as a strategy to reduce firearm suicides and unintentional firearm injuries and deaths.
- States with stand-your-ground laws should consider repealing them as a strategy for reducing firearm homicides.
- States without laws prohibiting gun ownership while individuals are subject to domestic violence restraining orders should consider passing such laws as a strategy for reducing total and firearm-related intimate partner homicides.
- States without waiting period laws should consider adopting them as a strategy for reducing suicides and homicides.
- To improve understanding of the real effects of gun policies, Congress should consider appropriating funds for a significant program of research on gun policy and gun violence reduction at levels comparable to the government's current investment in other threats to public safety and health.
- To improve understanding of outcomes of critical concern to many in gun policy debates, the U.S. government and private research sponsors should support research examining the effects of gun laws on a wider set of outcomes, including crime, defensive gun use, hunting and sport shooting, officer-involved shootings, and the gun industry.
- To foster a more robust research program on gun policy, Congress should consider eliminating or loosening the restrictions it has imposed on the use of gun trace data for research purposes.
- Researchers, reviewers, academics, and science reporters should expect new analyses of the effects of gun policies to improve on earlier studies by persuasively addressing the methodological limitations of earlier studies, such as problems with statistical power, model overfitting, covariate selection, and poorly calibrated standard errors.
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Table of Contents
Part A
Introduction and Methods
Chapter One
Introduction
Chapter Two
Methods
Part B
Evidence for the Effects of Policies Regulating Who May Legally Own, Purchase, or Possess Firearms
Chapter Three
Minimum Age Requirements
Chapter Four
Prohibitions Associated with Mental Illness
Chapter Five
Prohibitions Associated with Domestic Violence
Chapter Six
Surrender of Firearms by Prohibited Possessors
Chapter Seven
Extreme Risk Protection Orders
Part C
Evidence for the Effects of Policies Regulating Firearm Sales and Transfers
Chapter Eight
Background Checks
Chapter Nine
Licensing and Permitting Requirements
Chapter Ten
Waiting Periods
Chapter Eleven
Firearm Safety Training Requirements
Chapter Twelve
Lost or Stolen Firearm Reporting Requirements
Chapter Thirteen
Firearm Sales Reporting, Recording, and Registration Requirements
Chapter Fourteen
Bans on the Sale of Assault Weapons and High-Capacity Magazines
Chapter Fifteen
Bans on Low-Quality Handguns
Part D
Evidence for the Effects of Policies Regulating the Legal Use, Storage, or Carrying of Firearms
Chapter Sixteen
Stand-Your-Ground Laws
Chapter Seventeen
Child-Access Prevention Laws
Chapter Eighteen
Concealed-Carry Laws
Chapter Nineteen
Gun-Free Zones
Chapter Twenty
Laws Allowing Armed Staff in K–12 Schools
Part E
Summary of Findings and Recommendations
Chapter Twenty-One
Summary and Conclusions
Appendix A
Changes from the First Edition of This Report
Research conducted by
Funding for this philanthropically supported research was originally provided through unrestricted gifts from RAND supporters and income from operations and supported by a grant from Arnold Ventures. The research was conducted by the Justice Policy Program within Social and Behavioral Policy Program.
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