Who Watches the Watchmen: Evidence of the Effect of Body-Worn Cameras on New York City Policing

48 Pages Posted: 5 Dec 2019 Last revised: 24 Sep 2020

See all articles by Mitchell Zamoff

Mitchell Zamoff

University of Minnesota - Twin Cities - School of Law

Brad N. Greenwood

George Mason University - School of Business

Gordon Burtch

University of Minnesota - Twin Cities - Carlson School of Management

Date Written: September 23, 2020

Abstract

A flurry of research examining the effect of body-worn cameras (BWCs) on policing has arrived at mixed and inconclusive set findings. We present a multi-year study of the precinct-by-precinct rollout of BWCs in the New York City Police Department (NYPD), the largest metropolitan police force in the United States. Our study adds meaningfully to the prior body of work and begins to clarify some of the discord within it, particularly with respect to large urban police departments. We estimate the effect of BWC deployment on precinct volumes of citizen stops, arrests, complaints against officers and use-of-force incidents. Results indicate that BWCs lead to both significant increases in police stops of citizens, and significant decreases in arrests and citizen complaints. We find no significant change in the use of force by officers. We also document evidence of significant heterogeneity in the nature of stops and complaints. Our findings speak to at least three potential benefits of BWCs in urban law enforcement: (1) an increase in legitimate proactive policing; (2) a decrease in citizen complaints alleging that the police have abused their authority; and (3) a reduction in arrests (which appears to be beneficial regardless of whether the reduction is a result of modified behavior on the part of police, citizens, or both).

Keywords: Body-worn cameras, difference in difference, police stops, police arrests, citizen complaints, NYPD

JEL Classification: K10, K14, K42

Suggested Citation

Zamoff, Mitchell and Greenwood, Brad and Burtch, Gordon, Who Watches the Watchmen: Evidence of the Effect of Body-Worn Cameras on New York City Policing (September 23, 2020). Available at SSRN: https://ssrn.com/abstract=3490785 or http://dx.doi.org/10.2139/ssrn.3490785

Mitchell Zamoff

University of Minnesota - Twin Cities - School of Law ( email )

229 19th Avenue South
Minneapolis, MN 55455
United States

Brad Greenwood

George Mason University - School of Business ( email )

VA 22030
United States

Gordon Burtch (Contact Author)

University of Minnesota - Twin Cities - Carlson School of Management ( email )

19th Avenue South
Minneapolis, MN 55455
United States

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