Injuries Associated with Police Use of Force

AbstractBackgroundUse of Force [UOF] by police can result in serious injuries and fatalities. The risk of significant injuries associated with different force modalities is poorly defined. We sought to determine the incidence of police UOF and compare the likelihood of significant injury with different force modalities.MethodsA prospective multicenter observational study of all UOF incidents was conducted via mandatory UOF investigations at three mid-sized police agencies over a two year period. Expert physicians reviewed police and medical records to determine injury severity using a priori injury severity stratification criteria.ResultsThere were 893 UOF incidents, representing a UOF rate of 0.086% of 1,041,737 calls for service (1 in 1167) and 0.78 % of 114,064 criminal arrests(1 in 128). Suspects were primarily young (mean age 31 years, range 12-86) males (89%).The 1399 force utilizations included Unarmed Physical Force (n=710, 51%), Conducted Electrical Weapons [CEWs] (504, 30%), Chemical (88, 6.3%), Canines (47, 3.4%), Impact Weapons (9, 0.6%), Kinetic Impact Munitions (8, 0.6%), Firearms (6, 0.4%), and other (27, 1.9%).Among 914 suspects, 898 (98%) sustained no or mild injury after police UOF. Significant (moderate or severe) injuries occurred in 16 subjects (1.8%). Logistic regression analysis shows these are most associated with firearm and canine use. There was one fatality (0.1%) due to gunshots. No significant injuries occurred among 504 CEW uses (0%; 95% CI 0.0–0.9%).Of the 355 suspects transported to a medical facility, 78 (22%) were hospitalized. The majority of hospitalizations were unrelated to UOF (n=59, 76%), while a minority (n=19, 24%) were due to injuries related to police UOF.ConclusionsPolice UOF is rare. When force is used officers most commonly rely on unarmed physical force and CEWs. Significant injuries are rare. Transport for medical evaluation is a poor surrogate for significant injury due to UOF.Level of EvidenceLevel II (Prospective Study with less than large effect and no negative criteria) Background Use of Force [UOF] by police can result in serious injuries and fatalities. The risk of significant injuries associated with different force modalities is poorly defined. We sought to determine the incidence of police UOF and compare the likelihood of significant injury with different force modalities. Methods A prospective multicenter observational study of all UOF incidents was conducted via mandatory UOF investigations at three mid-sized police agencies over a two year period. Expert physicians reviewed police and medical records to determine injury severity using a priori injury severity stratification criteria. Results There were 893 UOF incidents, representing a UOF rate of 0.086% of 1,041,737 calls for service (1 in 1167) and 0.78 % of 114,064 criminal arrests(1 in 128). Suspects were primarily young (mean age 31 years, range 12-86) males (89%). The 1399 force utilizations included Unarmed Physical Force (n=710, 51%), Conducted Electrical Weapons [CEWs] (504, 30%), Chemical (88, 6.3%), Canines (47, 3.4%), Impact Weapons (9, 0.6%), Kinetic Impact Munitions (8, 0.6%), Firearms (6, 0.4%), and other (27, 1.9%). Among 914 suspects, 898 (98%) sustained no or mild injury after police UOF. Significant (moderate or severe) injuries occurred in 16 subjects (1.8%). Logistic regression analysis shows these are most associated with firearm and canine use. There was one fatality (0.1%) due to gunshots. No significant injuries occurred among 504 CEW uses (0%; 95% CI 0.0–0.9%). Of the 355 suspects transported to a medical facility, 78 (22%) were hospitalized. The majority of hospitalizations were unrelated to UOF (n=59, 76%), while a minority (n=19, 24%) were due to injuries related to police UOF. Conclusions Police UOF is rare. When force is used officers most commonly rely on unarmed physical force and CEWs. Significant injuries are rare. Transport for medical evaluation is a poor surrogate for significant injury due to UOF. Level of Evidence Level II (Prospective Study with less than large effect and no negative criteria) Corresponding Author/Address for Reprints: William P. Bozeman, MD, Wake Forest School of Medicine, Dept of Emergency Medicine, 1 Medical Center Blvd, Winston Salem, NC 27157, wbozeman@wakehealth.edu, Phone: (336) 716-6320 Fax (336) 716-1705 Funding: Department of Justice/National Institute of Justice Conflicts of Interest: None. National/International Meeting Presentations: 2013 American College of Emergency Physicians Scientific Assembly (Oct 14, 2013 in Seattle, WA) 122nd Annual Meeting of the International Association of Chiefs of Police (Oct 27, 2015 in Chicago, IL) © 2017 Lippincott Williams & Wilkins, Inc.

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