Research Letter

Homicide Risk During 10-Day Waiting Period Among First-Time Handgun Purchasers in California

JAMA Internal Medicine 10.1001/jamainternmed.2026.1037

May 26, 2026 at 11:00 AM EDT

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This cohort study assesses the occurrence and risk of death by homicide involving gun purchasers and their cohabitants during a mandatory period between the purchase and physical possession of the gun.

Corresponding Author: Sonja A. Swanson, ScD, Department of Epidemiology, University of Pittsburgh School of Public Health, 130 De Soto St, Pittsburgh, PA 15261 (sas766@pitt.edu).

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