To examine differences in use of force by police patrol and specialized units, and the impact of body-worn cameras (BWCs) on use of force in these groups.
We use administrative data from the Tempe (AZ) Police Department collected during a randomized controlled trial (RCT) of BWCs. t tests of means and ARIMA models were constructed to analyze unit-level variation in use of force.
Tempe officers in specialized units use substantially more force than patrol officers. BWCs had no impact on use of force among patrol officers but were associated with a significant decline in force among specialty unit officers who received BWCs in the second phase of the study.
Unit-level variations in force can have implications for selection, training, and other areas of police practice. Additionally, our findings show the necessity of accounting for group variation within departments when assessing the impact of BWCs on outcomes like use of force.
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The larger evaluation encompassed a number of other components (see Gaub et al. 2016, 2020; White et al. 2018b; Todak et al. 2018). The randomization protocol called for all officers below the rank of lieutenant (including sergeants, officers, and some designated as detectives) who were assigned to the patrol division (N = 200) to be randomly assigned to receive a BWC during either phase 1 (November 2015) or phase 2 (May 2016). The department had already planned to use a phased approach to deploying BWCs, so randomization permitted an experimental design.
The Tactical Response Unit (TRU) is the full-time SWAT unit; several officers in other assignments are SWAT-certified and respond to calls with TRU when a larger response is needed.
Adams, K. (1999). What we know about police use of force. Use of force by police: overview of national and local data (pp. 1–14).
Alpert, G. P., & Smith, W. C. (1994). How reasonable is the reasonable man: police and excessive force. The Journal of Criminal Law and Criminology (1973-), 85(2), 481–501.
Ariel, B. (2017). Police body cameras in large police departments. The Journal of Criminal Law and Criminology, 106(4), 729–768.
Ariel, B., Farrar, W. A., & Sutherland, A. (2015). The effect of police body-worn cameras on use of force and citizens’ complaints against the police: a randomized controlled trial. Journal of Quantitative Criminology, 31(3), 1–27.
Ariel, B., Sutherland, A., Henstock, D., Young, J., Drover, P., Sykes, J., Megicks, S., & Henderson, R. (2016). Report: increases in police use of force in the presence of body-worn cameras are driven by officer discretion: a protocol-based subgroup analysis of ten randomized experiments. Journal of Experimental Criminology, 12(3), 453–463.
Banton, M. (1964). The policeman in the community. New York: Basic Books.
Bayley, D. H., & Garofalo, J. (1989). The management of violence by police patrol officers. Criminology, 27(1), 1–26.
Bittner, E. (1967). The police on skid-row: a study of peace keeping. American Sociological Review, 32(5), 699–715.
Bittner, E. (1970). The functions of the police in modern society. Bethesda: National Institute of Mental Health.
Braga, A. A., Barao, L., McDevitt, J., & Zimmerman, G. (2018a). The impact of body-worn cameras on complaints against officers and officer use of force incident reports: preliminary evaluation findings. Boston: School of Criminology and Criminal Justice, Northeastern University.
Braga, A. A., Sousa, W., Coldren, J. R., & Rodriguez, D. (2018b). The effects of body worn cameras on police activity and police-citizen encounters: a randomized controlled trial. The Journal of Criminal Law and Criminology, 108(3), 511–538.
Brandl, S. G., Stroshine, M. S., & Frank, J. (2001). Who are the complaint-prone officers?: an examination of the relationship between police officers’ attributes, arrest activity, assignment, and citizens’ complaints about excessive force. Journal of Criminal Justice, 29(6), 521–529.
Bureau of Justice Assistance. (2016). Body-Worn Camera Toolkit. https://www.bja.gov/bwc/.
Campbell, A., Berk, R. A., & Fyfe, J. J. (1998). Deployment of violence: the Los Angeles Police Department’s use of dogs. Evaluation Review, 22(4), 535–561.
Davis, E., Whyde, A, & Langton, L. (2018). Contacts between police and the public, 2015. NCJ 251145. Bureau of Justice Statistics.
Edmonton Police Service. (2015). Body worn video: Considering the evidence. In Final report of the Edmonton police service body worn video pilot project. Edmonton: Edmonton Police Service.
Friedrich, R. J. (1980). Police use of force: individuals, situations, and organizations. The Annals of the American Academy of Political and Social Science, 452(1), 82–97.
Fyfe, J. J. (1979). Administrative interventions on police shooting discretion: an empirical examination. Journal of Criminal Justice, 7(4), 309–324.
Fyfe, J. J. (1980). Geographic correlates of police shooting: a microanalysis. Journal of Research in Crime and Delinquency, 17(1), 101–113.
Fyfe, J. J. (1981). Observations on police deadly force. Crime & Delinquency, 27(3), 376–389.
Fyfe, J. J. (1988). Police use of deadly force: research and reform. Justice Quarterly, 5(2), 165–205.
Fyfe, J. J. (2002). Too many missing cases: holes in our knowledge about police use of force. Justice Research and Policy, 4(1), 87–102.
Garner, J. H., & Maxwell, C. D. (2002). Understanding the use of force by and against the police in six jurisdictions. Washington, DC: National Institute of Justice.
Garner, J. H., Schade, T., Hepburn, J., & Buchanan, J. (1995). Measuring the continuum of force used by and against the police. Criminal Justice Review, 20(2), 146–168.
Garner, J. H., Maxwell, C. D., & Heraux, C. G. (2002). Characteristics associated with the prevalence and severity of force used by the police. Justice Quarterly, 19(4), 705–746.
Gaub, J. E., Choate, D. E., Todak, N., Katz, C. M., & White, M. D. (2016). Officer perceptions of body-worn cameras before and after deployment: a study of three departments. Police Quarterly, 19(3), 275–302.
Gaub, J. E., Todak, N., & White, M. D. (2020). One size doesn’t fit all: the deployment of police body-worn cameras to specialty units. International Criminal Justice Review, 30(2), 136–155.
Geller, W. A., & Scott, M. (1992). Deadly force: what we know: a practitioner’s desk reference on police-involved shootings. Washington, DC: Police Executive Research Forum.
Headley, A. M., Guerette, R. T., & Shariati, A. (2017). A field experiment of the impact of body-worn cameras (BWCs) on police officer behavior and perceptions. Journal of Criminal Justice, 53, 102–109.
Henstock, D., & Ariel, B. (2017). Testing the effects of police body-worn cameras on use of force during arrests: a randomised controlled trial in a large British police force. European Journal of Criminology, 14(6), 720–750.
Hickey, E. R., & Hoffman, P. B. (2003). To bite or not to bite: canine apprehensions in a large, suburban police department. Journal of Criminal Justice, 31(2), 147–154.
Hickman, M. J., Piquero, A. R., & Garner, J. H. (2008). Toward a national estimate of police use of nonlethal force. Criminology & Public Policy, 7(4), 563–604.
International Association of Chiefs of Police. (2002). Police use of force in America. Alexandria: International Association of Chiefs of Police.
Jennings, W. G., Lynch, M. D., & Fridell, L. (2015). Evaluating the impact of police officer body-worn cameras (BWCs) on response-to-resistance and serious external complaints: evidence from the Orlando Police Department (OPD) experience utilizing a randomized controlled experiment. Journal of Criminal Justice, 43(6), 480–486.
Jennings, W. G., Fridell, L. A., Lynch, M., Jetelina, K. K., Reingle, J. M., & Gonzalez. (2017). A quasi-experimental evaluation of the effects of police body-worn cameras (BWCs) on response-to-resistance in a large metropolitan police department. Deviant Behavior, 38(11), 1332–1339.
Kania, R. R. E., & Mackey, W. C. (1977). Police violence as a function of community characteristics. Criminology, 15(1), 27–48.
Kappeler, V. E., Sluder, R. D., & Alpert, G. P. (1998). Forces of deviance: understanding the dark side of policing (2nd ed.). Long Grove: Waveland Press.
Klahm, C. F., Frank, J., & Liederbach, J. (2014). Understanding police use of force. Policing: An International Journal of Police Strategies & Management, 37(3), 558–587.
Klinger, D. (2004). Environment and organization: reviving a perspective on the police. The Annals of the American Academy of Political and Social Science, 593(1), 119–136.
Klinger, D. (2008). On the importance of sound measures of forceful police actions. Criminology & Public Policy, 7(4), 605–617.
Klockars, C. B. (1996). A theory of excessive force and its control. In W. A. Geller & H. Toch (Eds.), Police violence: understanding and controlling police abuse of force (pp. 1–22). New Haven: Yale University Press.
Koslicki, W. M., Makin, D. A., & Willits, D. (2020). When no one is watching: evaluating the impact of body-worn cameras on use of force incidents. Policing and Society.
Lersch, K. M. (1998). Exploring gender differences in citizen allegations of misconduct. Women & Criminal Justice, 9(4), 69–79.
Liska, A. E., & Yu, J. (1992). Specifying and testing the threat hypothesis: police use of deadly force. In A. E. Liska (Ed.), Social threat and social control (pp. 53–68). Albany: State University of New York Press.
Lum, C., Stoltz, M., Koper, C. S., & Amber Scherer, J. (2019). The research on body-worn cameras: what we know, what we need to know. Criminology & Public Policy, 18(1), 93–118.
Malm, A. (2019). The promise of body-worn cameras. Criminology & Public Policy, 18(1), 119–130.
Manning, P. K. (1978). The police: mandate, strategies, and appearances. In P. K. Manning & J. Van Maanen (Eds.), Policing: A view from the street (pp. 7–31). New York: Random House.
Mastrofski, S. D. (1983). The police and noncrime services. In G. P. Whitaker & C. Phillips (Eds.), Evaluating the performance of criminal justice agencies. Beverly Hills: Sage Publications.
Matulia, K. R. (1985). A balance of forces (2nd ed.). Gaithersburg: International Association of Chiefs of Police.
McDowall, D., & McCleary, R. (2014). Interrupted time series models. In G. Bruinsma & D. Weisburd (Eds.), In Encyclopedia of criminology and criminal justice (Vol. 2). New York: Springer.
McDowall, D., McCleary, R., Meidinger, E. E., & Hay, R. A. (1980). Interrupted time series analysis. Newbury Park: Sage.
McElvain, J. P., & Kposowa, A. J. (2008). Police officer characteristics and the likelihood of using deadly force. Criminal Justice and Behavior, 35(4), 505–521.
Mears, D. P., Craig, M. O., Stewart, E. A., & Warren, P. Y. (2017). Thinking fast, not slow: how cognitive biases may contribute to racial disparities in the use of force in police-citizen encounters. Journal of Criminal Justice, 53, 12–24.
Muir, W. K. (1977). Police: streetcorner politicians. Chicago: University of Chicago Press.
Mulvey, P., & White, M. D. (2014). The potential for violence in arrests of persons with mental illness. Policing: An International Journal of Police Strategies & Management, 37(2), 404–419.
Nix, J., Campbell, B. A., Byers, E. H., & Alpert, G. P. (2017). A bird’s eye view of civilians killed by police in 2015: further evidence of implicit bias. Criminology & Public Policy, 16(1), 309–340.
Paoline, E. A., & Terrill, W. (2004). Women police officers and the use of coercion. Women & Criminal Justice, 15(3–4), 97–119.
Paoline, E. A., & Terrill, W. (2007). Police education, experience, and the use of force. Criminal Justice and Behavior, 34(2), 179–196.
Peterson, B. E., Yu, L., La Vigne, N., & Lawrence, D. S. (2018). The Milwaukee Police Department’s body-worn camera program. Washington, D.C.: Urban Institute.
Police Executive Research Forum. (2019). PERF welcomes new board members. Subject to Debate, 33(2) https://www.policeforum.org/assets/December2019Debate.pdf.
President’s Task Force on 21st Century Policing. (2015). Final report of the President’s task force on 21st century policing. Washington, DC: Office of Community Oriented Policing Services.
Reaves, B. A. (2015). Local police departments, 2013: personnel, policies, and practices. Washington, DC: Bureau of Justice Statistics.
Reingle Gonzalez, J. M., Bishopp, S. A., Jetelina, K. K., Paddock, E., Gabriel, K. P., & Brad Cannell, M. (2019). Does military veteran status and deployment history impact officer involved shootings? A case-control study. Journal of Public Health, 19.
Reiss, A. J. (1971). The police and the public. New Haven: Yale University Press.
Ripley, A., & Williams, T. (2017). Body cameras have little effect on police behavior, study says. The New York Times, 20, 2017.
Schuck, A. M., & Rabe-Hemp, C. (2007). Women police: the use of force by and against female officers. Women & Criminal Justice, 16(4), 91–117.
Shjarback, J. A., & White, M. D. (2016). Departmental professionalism and its impact on indicators of violence in police–citizen encounters. Police Quarterly, 19(1), 32–62.
Skolnick, J. H., & Fyfe, J. J. (1993). Above the law: police and the excessive use of force. New York: The Free Press.
Sun, I. Y., & Payne, B. K. (2004). Racial differences in resolving conflicts: a comparison between Black and White police officers. Crime & Delinquency, 50(4), 516–541.
Sutherland, A., Ariel, B., Farrar, W., & De Anda, R. (2017). Post-experimental follow-ups—fade-out versus persistence effects: the rialto police body-worn camera experiment four years on. Journal of Criminal Justice, 53, 110–116.
Terrill, W. (2016). Deadly force: to shoot or not to shoot. Criminology & Public Policy, 15(2), 491–496.
Terrill, W., & Mastrofski, S. D. (2002). Situational and officer-based determinants of police coercion. Justice Quarterly, 19(2), 215–248.
Terrill, W., & Paoline, E. A. (2012). Examining less lethal force policy and the force continuum: results from a national use-of-force Study. Police Quarterly, 16(1), 38–65.
Terrill, W., & Reisig, M. D. (2003). Neighborhood context and police use of force. Journal of Research in Crime and Delinquency, 40(3), 291–321.
Terrill, W., Paoline, E. A., & Manning, P. K. (2003). Police culture and coercion. Criminology, 41(4), 1003–1034.
The National Advisory Commission on Civil Disorders. (1968). Report of the National Advisory Commission on civil disorders. Washington, DC: US Government Printing Office.
Todak, N., & White, M. D. (2019). Expert officer perceptions of de-escalation in policing. Policing: An International Journal, 42(5), 832–846.
Todak, N., Gaub, J. E., & White, M. D. (2018). The importance of external stakeholders for police body-worn camera diffusion. Policing: An International Journal, 41(4), 448–464.
White, M. D. (2001). Controlling police decisions to use deadly force: reexamining the importance of administrative policy. Crime & Delinquency, 47(1), 131–151.
White, M. D. (2007). Current issues and controversies in policing. Boston: Allyn and Bacon/Pearson.
White, M. D. (2014). Police officer body-worn cameras: assessing the evidence. Washington, DC: U.S. Department of Justice, Office of Justice Programs.
White, M. D. (2016). Transactional encounters, crisis-driven reform, and the potential for a national police deadly force database. Criminology & Public Policy, 15(1), 223–235.
White, M. D. (2019). Translating the story on body-worn cameras. Criminology & Public Policy, 18(1), 89–91.
White, M. D., & Fradella, H. F. (2016). Stop and frisk: the use and abuse of a controversial policing tactic. New York: New York University Press.
White, M. D., & Klinger, D. (2012). Contagious fire? An empirical assessment of the problem of multi-shooter, multi-shot deadly force incidents in police work. Crime & Delinquency, 58(2), 196–221.
White, M. D., & Malm, A. (2020). Cops, cameras, and crisis: the emergence of body-worn cameras in 21st century policing. New York: New York University Press.
White, M. D., Gaub, J. E., & Todak, N. (2018a). Exploring the potential for body-worn cameras to reduce violence in police-citizen encounters. Policing: A Journal of Policy and Practice, 12(1), 66–76.
White, M. D., Todak, N., & Gaub, J. E. (2018b). Examining body-worn camera integration and acceptance among police officers, citizens, and external stakeholders. Criminology & Public Policy, 17(3), 649–677.
White, M. D., Gaub, J. E., & Padilla, K. E. (2019). Impacts of BWCs on use of force: directory of outcomes. Body-Worn Camera Training and Technical Assistance.. http://www.bwctta.com/resources/bwc-resources/impacts-bwcs-use-force-directory-outcomes.
Williams, J. J., & Westall, D. (2003). SWAT and non-SWAT police officers and the use of force. Journal of Criminal Justice, 31(5), 469–474.
Worden, R. E. (1995). The causes of police brutality: theory and evidence on police use of force. In W. A. Geller & H. Toch (Eds.), And justice for all: understanding and controlling police abuse of force (pp. 31–60). Washington, DC: Police Executive Research Forum.
Yokum, D., Ravishankar, A., & Coppock, A. (2017). Evaluating the effects of police body-worn cameras: a randomized controlled trial. Washington, DC: The Lab @ DC, Office of the City Administrator, Executive Office of the Mayor.
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Gaub, J.E., Todak, N. & White, M.D. The distribution of police use of force across patrol and specialty units: a case study in BWC impact. J Exp Criminol (2020). https://doi.org/10.1007/s11292-020-09429-8
- Body-worn cameras (BWCs)
- Use of force
- Randomized controlled trial (RCT)
- Specialty units