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Evaluation of California's Armed and Prohibited Persons System Study Protocol for a Cluster-Randomized Trial

NCJ Number
Injury Prevention Volume: 23 Issue: 5 Dated: 2017
Date Published
9 pages
Since too little is known about the effectiveness of efforts to prevent firearm violence, the current study's objective was to evaluate California's Armed and Prohibited Persons System (APPS), a law enforcement intervention that seeks to recover firearms from individuals who purchased them legally but subsequently became prohibited from having access to firearms, with prohibitions usually arising from events suggesting an increased risk for future violence.

This group-randomized trial involved approximately 20,000 APPS-eligible individuals in 1,041 communities. Randomization was performed at the community level, to early or later intervention (Group 1 and Group 2, respectively) with stratification by region, population and violent crime rate. APPS is being implemented by the California Department of Justice. The principal outcome measure was the incidence of arrest for a firearm-related or violent crime. Primary analysis will be on an intention-to-treat basis, comparing individuals in Group 1 and Group 2 communities. Analyses will focus on time to event, using proportional hazards regression with adjustment for the clustered nature of the data and incorporating individual- and community-level characteristics. Secondary analyses will examine the effect of the intervention on an as treated basis, effects on subgroups, and effects on community-wide measures such as crime rates. APPS may have a significant impact on risk for future violence among members of its target population. The findings of this study will likely be generalizable and have clear implications for violence prevention policy and practice. (publisher abstract modified)

Date Published: January 1, 2017