Most state gun laws show no clear link to lower death rates; however, universal background checks for weapons and ammunition, alongside firearm identification requirements, act as a vital filter to prevent tragedies. By prioritizing these three specific policies, the country could see a substantial drop in overall firearm-related deaths.

For decades, states have passed various laws to regulate firearm access, yet the connection between these rules and actual death rates has remained unclear. This uncertainty has made it difficult to determine which specific measures might best protect the public from the thousands of firearm-related deaths occurring annually.
Researchers examined data from all fifty states to compare twenty-five different laws against death statistics from twenty-ten. They found that most laws did not consistently lower mortality, but three specific policies functioned like a tightly woven safety net. These measures included checks on those buying guns, checks on those buying ammunition, and a system for identifying specific firearms.
This study highlights how specific administrative hurdles can lower the incidence of lethal violence. By mandating universal background checks, by requiring ammunition checks, and by implementing firearm identification, the nation could lower mortality through evidence-based policy.
Firearm legislation and firearm mortality in the USA: a cross-sectional, state-level study
Background In an effort to reduce firearm mortality rates in the USA, US states have enacted a range of firearm laws to either strengthen or deregulate the existing main federal gun control law, the Brady Law. We set out to determine the independent association of different firearm laws with overall firearm mortality, homicide firearm mortality, and suicide firearm mortality across all US states. We also projected the potential reduction of firearm mortality if the three most strongly associated firearm laws were enacted at the federal level. Methods We constructed a cross-sectional, state-level dataset from Nov 1, 2014, to May 15, 2015, using counts of firearm-related deaths in each US state for the years 2008-10 (stratified by intent [homicide and suicide]) from the US Centers for Disease Control and Prevention's Web-based Injury Statistics Query and Reporting System, data about 25 firearm state laws implemented in 2009, and state-specific characteristics such as firearm ownership for 2013, firearm export rates, and non-firearm homicide rates for 2009, and unemployment rates for 2010. Our primary outcome measure was overall firearm-related mortality per 100,000 people in the USA in 2010. We used Poisson regression with robust variances to derive incidence rate ratios (IRRs) and 95% CIs. Findings 31,672 firearm-related deaths occurred in 2010 in the USA (10·1 per 100,000 people; mean state-specific count 631·5 [SD 629·1]). Of 25 firearm laws, nine were associated with reduced firearm mortality, nine were associated with increased firearm mortality, and seven had an inconclusive association. After adjustment for relevant covariates, the three state laws most strongly associated with reduced overall firearm mortality were universal background checks for firearm purchase (multivariable IRR 0·39 [95% CI 0·23-0·67]; p=0·001), ammunition background checks (0·18 [0·09-0·36]; p Interpretation Very few of the existing state-specific firearm laws are associated with reduced firearm mortality, and this evidence underscores the importance of focusing on relevant and effective firearms legislation. Implementation of universal background checks for the purchase of firearms or ammunition, and firearm identification nationally could substantially reduce firearm mortality in the USA. Funding None.