The Office of Community Oriented Policing Services (COPS) funded the Youth Firearms Violence Initiative in 10 cities to support interventions aimed at decreasing the number of violent firearms crimes committed by youths. This Research in Brief summarizes an evaluation of these projects. The evaluation, sponsored by COPS and the National Institute of Justice, found that traditional enforcement tactics did not produce significant changes in firearms violence levels. However, when implemented as part of a broader community policing program—one that included such activities as school-based programs and neighborhood cleanup days—arrest policies that focused on gun-related offenses had a consistent measurable association with subsequent gun-related crime.