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State Point-of-Sale Comprehensive Background Check Policies and County Firearm Homicide Rates
Julia P Schleimer1,2,3, Camerin A Rencken1,2, Bradley H Wagenaar1,4
1Department of Epidemiology, School of Public Health, University of Washington, Seattle.
JAMA Network Open
|June 12, 2026
Summary
Comprehensive background check (CBC) policies did not show a significant association with firearm homicide rates at the county level in the US. Further research is needed on CBC policy design and implementation.
Area of Science:
- Public Health
- Criminology
- Health Policy
Background:
- Background checks are crucial for preventing illegal firearm transfers.
- Previous research indicated limited state-level effects of point-of-sale comprehensive background check (CBC) policies on firearm violence.
- State-level analyses may obscure important local variations in policy impact.
Purpose of the Study:
- To estimate the association between state-level point-of-sale CBC policies and county-level firearm homicide rates in the US.
- To investigate potential heterogeneity in CBC policy effects at the county level.
Main Methods:
- Cross-sectional study utilizing difference-in-differences analysis with synthetic controls.
- Included six US states implementing point-of-sale CBC policies (2013-2019) and eight comparable control states.
- Analyzed county-years from 2000 to 2021, focusing on annual county-level firearm homicide rates.
Main Results:
- Unadjusted models suggested a decrease in firearm homicides, but adjusted models found no significant association between CBC policies and county-level firearm homicide rates.
- Adjusted analysis revealed a mean difference of 0.13 (95% CI, -0.88 to 1.13) firearm homicides per 100,000 population.
- While some county-specific estimates varied, most confidence intervals included zero, indicating no statistically significant effect.
Conclusions:
- State-level point-of-sale CBC policies were not associated with significant changes in county-level firearm homicide rates in adjusted analyses.
- Findings align with prior state-level studies, suggesting CBC policies may not be effective in reducing firearm violence on their own.
- Further research is recommended to explore the nuances of CBC policy design, implementation, and enforcement to identify potential pathways for effectiveness.
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