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BACKGROUND: Privately made firearms (PMFs) or ghost guns are homemade, unserialized, untraceable firearms that have been increasingly used in violent crime in the United States. Very little is known about the types of PMFs recovered by law enforcement agencies and the crimes associated with these recoveries. This lack of information limits effective violence prevention policies and practices. Comparative analysis of PMF recoveries in specific cities helps clarify whether local PMF patterns and characteristics vary or reflect more general trends. This research advances epidemiological understanding of emergent violent gun injury prevention challenges by identifying variations in recovered PMF types and use in violent, drug, and weapon-related offenses in Los Angeles and San Diego, California. METHODS: Conjunctive analysis of case configurations (CACC) identifies patterns among observations (i.e., case configurations) and calculates their probability associated with a given outcome. CACC was used to identify the most common types of PMFs recovered by the Los Angeles (LAPD) and San Diego (SDPD) police departments. For each department and offense type, case configurations with above-average probabilities of offense involvement were determined. Comparisons across departments were made to identify similarities and differences in PMF characteristics and usage. RESULTS: PMFs were more likely to be involved in violent and weapon-related offenses in Los Angles but more likely to be involved in drug-related offenses in San Diego. In both cities, the 9 mm Polymer 80 handgun was the dominant PMF. However, 9 mm handguns were most likely to be involved in weapon-related offenses in Los Angeles compared to 0.40 handguns in San Diego. Furthermore, large-caliber handguns tended to display above-average probabilities of involvement in violent and drug offenses in Los Angeles. Long guns were represented in case configurations with above-average probabilities of involvement in substantive crimes, including violence. CONCLUSIONS: Comparative analyses of PMF recovery patterns in Los Angeles and San Diego reveal meaningful contextual variations in PMF characteristics and suggest intentional firearm type selections by offenders. The results support increased regulation of PMFs and highlight the importance of efforts to identify and disrupt the illicit supply of large-caliber PMF handguns and PMF long guns.

Research summary: The concern of crime in New York City public housing complexes motivated heightened police patrol of buildings and the enforcement of trespass laws. The 2013 federal court settlement of Davis et al. v. City of New York et al. mandated that the New York City Police Department (NYPD) implement a series of reforms, including the deployment of body‐worn cameras (BWCs) on officers, to address unconstitutional use of criminal trespass enforcement and stop and frisk practices in public housing developments. This study employed a stepped wedge quasi‐experimental design that involved the sequential crossover of public housing service area clusters from control to BWC implementation until all NYPD housing bureau officers were equipped with BWCs. Panel regression models at the individual officer and service area levels were used to estimate BWC program impacts on outcomes between 2015 and 2019. Logistic regression models were used to estimate the impact of the BWCs on the lawfulness of officer stop reports that were randomly selected for audit between 2017 and 2019. Results show that BWC deployment in public housing reduced excessive enforcement, citizen complaints, and use of force by NYPD housing officers. Findings further suggest that BWCs can help reduce constitutionally problematic stops and frisks of citizens. Policy implications: Problematic police activities in public housing contexts can be reformed using BWCs. When coupled with routine supervisory review of video footage, the deployment of BWCs on public housing officers can improve compliance with department directives to reduce enforcement actions and increase documentation of citizen stops. [ABSTRACT FROM AUTHOR]

Research Summary Policy Implications The evaluation literature suggests that focused deterrence strategies are effective in reducing gun violence. However, focused deterrence is notoriously difficult to implement and sustain. The history of focused deterrence implementation failure raises questions about its viability as a gun violence prevention strategy. Stockton, California, implemented focused deterrence three times during the past 25 years. In its most recent version, Stockton officials explicitly designed the strategy to be a permanent feature of the city's violence prevention portfolio. Although program caseloads diminished over the course of the COVID‐19 pandemic and the strategy faced leadership and resource challenges, Stockton's efforts prevented the program from being discontinued and, for those gang members who did receive treatment, delivered a robust gun violence prevention strategy. A quasi‐experimental evaluation shows that treated gang members were less likely to be shot and reduced their violent offending relative to similar untreated gang members. The focused deterrence impacts also appear to spill over to gang members who were socially connected to treated gang members. Although Stockton experienced an increase in homicides over the course of the COVID‐19 pandemic, the increase was not as steep as other comparable California cities.Focused deterrence strategies can be effective responses to gun violence problems when implemented properly. A priori planning is essential when jurisdictions prepare to adopt focused deterrence. Strategic management actions, such as maintaining a robust network of partnering agencies, developing accountability structures and sustainability plans, and conducting upfront and ongoing problem analysis, are critical elements that must be in place for focused deterrence to be effective and sustainable. [ABSTRACT FROM AUTHOR]