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To Kill A Bluebird Case Study

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To Kill A Bluebird Case Study
THE PHILADELPHIA FOOT PATROL
EXPERIMENT: A RANDOMIZED
CONTROLLED TRIAL OF POLICE PATROL
EFFECTIVENESS IN VIOLENT CRIME
HOTSPOTS∗
JERRY H. RATCLIFFE
Department of Criminal Justice
Temple University

TRAVIS TANIGUCHI
Police Department
Redlands, CA

ELIZABETH R. GROFF
Department of Criminal Justice
Temple University

JENNIFER D. WOOD
Department of Criminal Justice
Temple University

∗

C

The authors would like to thank Philadelphia Police Commissioner Charles
Ramsey and the executive team at the Philadelphia Police Department for their collaborative approach to research and their support of this project, including
Deputy Commissioner Richard Ross, Deputy Commissioner Tommy Wright,
Deputy Commissioner Kevin Bethel, Chief Administrative Officer Nola Joyce, …show more content…
The results identified a significant reduction in the level of treatment area violent crime after 12 weeks. A linear regression model with separate slopes fitted for treatment and control groups clarified the relationship even more. Even after accounting for natural regression to the mean, target areas in the top 40 percent on pretreatment violent crime counts had significantly less violent crime during the operational period. Target areas outperformed the control sites by 23 percent, resulting in a total net effect (once displacement was considered) of 53 violent crimes prevented. The results suggest that targeted foot patrols in violent crime hotspots can significantly reduce violent crime levels as long as a threshold level of violence exists initially. The findings contribute to a growing body of evidence on the contribution of hotspots and place-based policing to the reduction of crime, and especially violent crime, which is a significant public health threat in the United States. We suggest that intensive foot patrol efforts in violent hotspots may achieve deterrence at a microspatial level, primarily by increasing the certainty of disruption, apprehension,
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