This document discusses police corruption, defining it as misconduct by police officers involving misuse of authority for personal gain. It outlines the costs of corruption, which include undermining the criminal justice system and public confidence in police. Various types of corruption are described, such as accepting gratuities or bribes, theft, and brutality. Theories for why corruption occurs include issues with individual officers, police subculture, lack of oversight and management failures. Controlling corruption requires strong internal policies and leadership within police departments, as well as external oversight and accountability. However, completely eliminating corruption may not be possible.