STUDIES:   

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A majority of police officers agreed that “it is not unusual for police officers to ‘turn a blind eye’ to other officers' improper conduct.” Majority observe excessive force.

Police Attitudes Toward Abuse of Authority: Findings From a National Study Police Attitudes Toward Abuse of Authority: Findings From a National Study Exhibit 2: Use of force behavior in officers' departments Exhibit 2: Use of force behavior in officers' departments
Police Attitudes Toward Abuse of Authority: Findings From a National Study
U.S. Department of Justice National Institute of Justice
Weisburd, David / Greenspan, Rosann / Hamilton, Edwin E. / Williams, Hubert / Bryant, Kellie A.
May 2000
https://www.ncjrs.gov/pdffiles1/nij/181312.pdf
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