The evidence-based policing matrix at 14 years

Abstract Objective To update the 2011 results of the Evidence-Based Policing Matrix, a tool for analyzing, visualizing, and translating research on police crime prevention strategies. Methods We added 177 experimental and quasi-experimental studies to the original Matrix sample of 97 ( n = 274). We coded studies based on the intervention target, the reactivity or proactivity of the strategy, the generality or focus of the strategy, the research design, and the study outcomes. We analyzed the association of intervention characteristics and research designs with study outcomes using bivariate cross-tabulations and multivariate models. Results Broadly, strategies appear most effective when they are place-based, proactive, and tailored to specific problems. In multivariate analyses controlling for study rigor (which is inversely related to successful outcomes), strategies are most effective when they are focused in nature and targeted on micro-places. Conclusions Despite substantial growth in police research, conclusions about effective crime reduction strategies remain very similar.