State Point-of-Sale Comprehensive Background Check Policies and County Firearm Homicide Rates.
Schleimer JP; Rencken CA; Wagenaar BH; Kagawa RMC; Rowhani-Rahbar A · 2026 · JAMA network open
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
Importance Background checks aim to prevent illegal firearm transfers. Existing research has shown little evidence for the effect of point-of-sale comprehensive background check (CBC) policies on firearm-related violence at the state…
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Metadata source: Europe PMC · DOI 10.1001/jamanetworkopen.2026.18188