Gun policy and intimate partner violence

The presence of a firearm in a household with a history of domestic violence is associated with a roughly five-fold increase in the risk of intimate partner homicide of the female partner. The finding comes from Campbell and colleagues' eleven-city case-control study of intimate partner femicide, which compared women killed by intimate partners with a control sample of women in abusive relationships who were not killed. After controlling for severity of prior abuse, substance use, and other risk factors, firearm access remained one of the strongest independent predictors. The magnitude of effect places firearm access at or near the top of the risk-factor hierarchy for IPV lethality.

The 1996 Lautenberg Amendment prohibited firearms possession by anyone convicted of a misdemeanor crime of domestic violence, defined as an offense involving the use or attempted use of physical force or threatened use of a deadly weapon committed by a current or former spouse, cohabitant, parent, or guardian. The amendment closed the gap created by the prior framework, which prohibited possession only after felony convictions, even though most IPV is charged as misdemeanor assault. The amendment has been litigated extensively — over its retroactive application, its definitions, the categories of convictions that trigger it, and the procedural protections it requires — and survived a major Supreme Court challenge in United States v. Castleman (2014).

Federal law also prohibits possession by anyone subject to a qualifying domestic violence protective order, defined as an order issued after notice and an opportunity to be heard, restraining the person from harassing, stalking, or threatening an intimate partner or child, and including either a finding of credible threat or explicit prohibition of use of force. The "after notice and opportunity to be heard" language has historically excluded ex parte temporary protective orders, which are issued without prior notice to the respondent precisely because the alleged abuser cannot be alerted before the order issues. Many states have closed this gap at the state level by prohibiting possession during temporary order periods.

Until 2022, federal law's misdemeanor prohibition applied to spouses, ex-spouses, cohabitants, ex-cohabitants, and co-parents — but not to dating partners who never lived with the victim. The exclusion was substantively indefensible (the lethality data shows no meaningful distinction between cohabiting and non-cohabiting intimate partners) and was a long-standing target of reform. The Bipartisan Safer Communities Act of 2022 closed the loophole for new convictions of non-cohabiting dating partners but, as a compromise to secure passage, allowed restoration of firearm rights after five years for this category. The compromise was contested by advocates but accepted as the achievable improvement.

April Zeoli's research has exploited variation in state-level firearm prohibitions to estimate causal effects on IPV homicide. Her 2018 study found that state laws extending firearm prohibitions to dating partners were associated with a 13 percent reduction in intimate partner homicide; laws extending prohibitions to stalkers were associated with a 10 percent reduction. The effects are detectable within years of enactment, are robust to multiple specifications, and are largest in subsets of homicides for which the mechanism is plausible. The work has provided the empirical foundation for federal and state advocacy on dating partner inclusion.

Prohibiting possession is one thing; getting firearms out of the home of someone subject to a prohibition is another. Federal law does not specify a mechanism for retrieval of already-owned firearms when a prohibition attaches. States have developed varied approaches: some require respondents to surrender firearms to law enforcement or a licensed dealer within a specified time after the order issues, some require respondents to attest under penalty of perjury that they have transferred firearms to a non-prohibited person, some have no surrender mechanism at all. The presence and design of surrender procedures is among the most important variables in whether the federal prohibition is operationally effective.

Daniel Webster's work at the Johns Hopkins Center for Gun Violence Solutions has integrated the IPV-specific literature into the broader evidence base for gun violence prevention. His handgun purchaser licensing research demonstrates that licensing requirements reduce IPV firearm homicide alongside other categories. His work on permit-to-purchase laws shows similar effects. The integration matters because IPV firearm prohibitions, while specifically targeted, also depend on general-purpose infrastructure (background checks, licensing, prohibited person databases) that affects how effective the targeted prohibitions can be.

Federal firearm prohibitions depend on the National Instant Criminal Background Check System (NICS) to identify prohibited persons at the point of sale by federally licensed dealers. The system's effectiveness for IPV cases depends on whether protective orders and misdemeanor domestic violence convictions are entered into the database promptly and completely. Reporting compliance varies dramatically by state, and gaps in the database mean that prohibited persons may pass background checks. The private sale exemption — most states do not require background checks for sales between private parties — creates a parallel channel by which prohibited persons can acquire firearms.

ERPO (or red flag) laws allow law enforcement or, in some states, family members to petition a court for temporary removal of firearms from a person who poses a significant risk of harm to self or others, absent any underlying criminal charge or protective order. ERPOs have particular relevance for IPV cases where the survivor has not sought a protective order or where the protective order has not yet been issued. Connecticut's pioneering 1999 statute, Indiana's 2005 law, and the post-Parkland wave of state ERPO statutes have created infrastructure that, in jurisdictions with active use, demonstrably reduces firearm suicides and shows promise for IPV intervention.

State firearm-IPV policy varies enormously. A small set of states — California, Connecticut, New York, New Jersey, Hawaii, Maryland, Washington, Massachusetts — have implemented most or all of the architectural elements: comprehensive prohibitions including dating partners, surrender requirements with enforcement procedures, ex parte coverage, ERPO laws, robust background check requirements, and reporting compliance. A large set of states has implemented few or none. The variation is not random; it correlates with overall gun policy stringency, and the IPV homicide rates correlate accordingly. The natural experiment is ongoing.

Even where statutes exist, enforcement varies. Surrender requirements without verification mechanisms often produce nominal compliance only. Law enforcement agencies vary in their willingness and capacity to retrieve firearms from prohibited persons. Prosecutors rarely charge firearm possession by domestic violence misdemeanants under the federal Lautenberg provisions; such cases are typically uncovered when the firearm is used in subsequent violence rather than as standalone enforcement priorities. Compliance research suggests that fewer than half of respondents subject to firearm prohibitions actually surrender firearms in jurisdictions without active enforcement procedures.

The Supreme Court's 2022 decision in New York State Rifle and Pistol Association v. Bruen established a new test for Second Amendment challenges that focuses on historical analogues for modern firearm regulations. The decision has generated substantial litigation over IPV firearm prohibitions, with the Court itself addressing one such challenge in United States v. Rahimi (2024), where it upheld the protective order possession prohibition. The legal landscape post-Bruen is uncertain in ways that may constrain future expansions of IPV firearm prohibitions, though the Rahimi decision provides a doctrinal foothold for existing prohibitions.

The architecture required to translate the available evidence into reduced IPV homicide is well-understood. The political and institutional work required to build that architecture in jurisdictions that lack it is not finished. Federal expansion to fully close the dating partner loophole, comprehensive surrender procedures in every state, ex parte coverage everywhere, ERPO statutes with adequate funding for implementation, background check completion at the federal level, and active enforcement infrastructure are the agenda items. The collective-romantic claim is that the lethality of intimate violence is a variable that policy can move, and that the policy choices that would move it are known. The choice not to make them is a choice with countable consequences.

1. Campbell, Jacquelyn C., Daniel Webster, Jane Koziol-McLain, Carolyn Block, Doris Campbell, Mary Ann Curry, Faye Gary, et al. "Risk Factors for Femicide in Abusive Relationships: Results from a Multisite Case Control Study." American Journal of Public Health 93, no. 7 (2003): 1089–1097. 2. Zeoli, April M., Alexander McCourt, Shani Buggs, Shannon Frattaroli, David Lilley, and Daniel W. Webster. "Analysis of the Strength of Legal Firearms Restrictions for Perpetrators of Domestic Violence and Their Associations with Intimate Partner Homicide." American Journal of Epidemiology 187, no. 11 (2018): 2365–2371. 3. Zeoli, April M., and Daniel W. Webster. "Effects of Domestic Violence Policies, Alcohol Taxes, and Police Staffing Levels on Intimate Partner Homicide in Large U.S. Cities." Injury Prevention 16, no. 2 (2010): 90–95. 4. Webster, Daniel W., Cassandra K. Crifasi, and Jon S. Vernick. "Effects of the Repeal of Missouri's Handgun Purchaser Licensing Law on Homicides." Journal of Urban Health 91, no. 2 (2014): 293–302. 5. Webster, Daniel W., Shannon Frattaroli, Jon S. Vernick, Christopher O'Sullivan, Jane Roehl, and Jacquelyn C. Campbell. "Women with Protective Orders Report Failure to Remove Firearms from Their Abusive Partners: Results from an Exploratory Study." Journal of Women's Health 19, no. 1 (2010): 93–98. 6. Vigdor, Elizabeth Richardson, and James A. Mercy. "Do Laws Restricting Access to Firearms by Domestic Violence Offenders Prevent Intimate Partner Homicide?" Evaluation Review 30, no. 3 (2006): 313–346. 7. Sorenson, Susan B. "Guns in Intimate Partner Violence: Comparing Incidents by Type of Weapon." Journal of Women's Health 26, no. 3 (2017): 249–258. 8. United States v. Castleman, 572 U.S. 157 (2014). 9. United States v. Rahimi, 602 U.S. ___ (2024). 10. Bipartisan Safer Communities Act, Pub. L. No. 117-159, 136 Stat. 1313 (2022). 11. Lautenberg Amendment, Omnibus Consolidated Appropriations Act, 1997, Pub. L. No. 104-208, § 658, 110 Stat. 3009 (1996). 12. Díez, Carolina, Rachel P. Kurland, Emily F. Rothman, Megan Bair-Merritt, Eric Fleegler, Ziming Xuan, Sandro Galea, et al. "State Intimate Partner Violence-Related Firearm Laws and Intimate Partner Homicide Rates in the United States, 1991 to 2015." Annals of Internal Medicine 167, no. 8 (2017): 536–543.