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State Point-of-Sale Comprehensive Background Check Policies and County Firearm Homicide Rates.

Julia P Schleimer^1,2,3, Camerin A Rencken^1,2, Bradley H Wagenaar^1,4

¹Department of Epidemiology, School of Public Health, University of Washington, Seattle.

JAMA Network Open

|June 12, 2026

Summary

This summary is machine-generated.

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.

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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.