The intersection of firearms and intimate partner violence is the place where the U.S. domestic violence response either saves lives or fails to. The empirical literature on this point is unusually unambiguous for a contested policy area. The presence of a firearm in a household with a history of intimate partner violence increases the risk of homicide of the female partner by a factor of approximately five. Intimate partner homicides committed with firearms are substantially more lethal than those committed with other weapons, because firearms permit instant escalation from threat to fatal injury and because they reach across distance in ways that other weapons cannot. Roughly half of all female homicide victims in the United States are killed by current or former intimate partners, and the majority of those killings are committed with firearms.

April Zeoli and Daniel Webster, working separately and in collaboration over more than two decades, have produced the body of evidence that translates the bedside epidemiology into policy analysis. Zeoli's work has focused on the effects of specific legal interventions — domestic violence firearm prohibitions, protective order surrender requirements, dating partner inclusion, ex parte order coverage — on intimate partner homicide rates. Webster's work at the Johns Hopkins Center for Gun Violence Solutions has integrated the intimate partner findings into the broader gun policy literature, providing both the technical and the institutional infrastructure for translating evidence into legislation. The combined output is one of the more rigorous evidence bases in U.S. gun policy, and one of the more underutilized.

The federal framework rests on the 1994 Gun Control Act prohibitions, expanded by the 1996 Lautenberg Amendment, and partially modernized by the 2022 Bipartisan Safer Communities Act. Federal law prohibits firearm possession by anyone subject to a qualifying domestic violence protective order, anyone convicted of a felony, and (post-Lautenberg) anyone convicted of a misdemeanor crime of domestic violence. The 2022 amendment closed part of the "boyfriend loophole" by extending the misdemeanor prohibition to dating partners not living with the survivor. The federal framework is, however, only as effective as state implementation makes it: federal law does not by itself create a mechanism to remove firearms already in the home, to verify compliance, or to enforce the prohibition outside of subsequent federal prosecution.

The planning law (Law 4) is the operative frame because firearms-IPV policy is a quintessential exercise in legal architecture spanning federal and state law, statute and procedure, courts and law enforcement. The architecture required to actually reduce IPV homicide includes: (1) statutes prohibiting possession by abusers, (2) surrender procedures triggered when prohibitions attach, (3) law enforcement infrastructure to physically retrieve firearms, (4) courts that issue prohibition orders quickly and with appropriate scope, (5) data systems that flag prohibited persons in background checks, (6) extreme risk protection order (red flag) processes that allow temporary removal absent a criminal charge or protective order, and (7) compliance and enforcement mechanisms that make the prohibitions operational rather than nominal. Most U.S. jurisdictions have some but not all of these elements; the jurisdictions that have all of them experience measurably lower IPV homicide rates.

Zeoli's natural-experiment work demonstrates that state-level extensions of firearm prohibitions to dating partners reduce intimate partner homicide by approximately 10 to 14 percent; that surrender requirements (as opposed to mere possession prohibitions) reduce IPV firearm homicide more substantially; that ex parte coverage (firearm prohibitions attaching at the temporary protective order stage rather than only at the permanent order) saves additional lives; and that the effects are detectable within the first years after enactment. The policy implications are clear: each architectural element matters, the elements are complementary rather than redundant, and partial implementation produces partial effect.

The collective-romantic stakes are unusually high because firearms are the proximate mechanism by which controlling relationships become fatal ones. A regime of coercive control, financial abuse, and threat that might have produced lifelong harm without a firearm in the home produces a lethal outcome with one. The deeper romantic-collective lesson is that the lethality of intimate violence is not a fixed feature of the relationship; it is in significant part a policy variable. Jurisdictions can choose, through deliberate legal architecture, to make the same controlling relationship less likely to end in homicide. Some jurisdictions have made this choice; many have not; the gap is measurable in lives.