The internal affairs division in a police department investigates charges that officers are guilty of wrongdoing.
A police department has multiple divisions, of which the internal affairs is one. The internal affairs is tasked with the mandate to investigate allegations and suspicions of misconduct and law-breaking against officers of the force.
It is therefore akin to a self-regulating and in-house vigilance body of the law enforcement agency. Its function is primarily policing rather than enforcement.
Investigations by the internal affairs division have to be undergirded by extensive documentations, recording all evidence, collating police reports, etc.
Due to common perception of bias in the investigative processes, some police departments have instituted citizen oversight mechanisms.
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