Police officers are meant to serve the public and protect citizens. But there are some cops out there who grossly abuse their positions of authority for their own gain. Even more disturbing, however, are the law enforcement officials who commit truly heinous acts (either on the job or off), utilizing their specialized training to evade capture. Throughout world history, we've seen several instances of cops who tortured people, officers found guilty of multiple rapes and assaults, and even serial killer cops who score as high on the sadism scale as murderers like BTK (Dennis Rader). The rapists, torturers, and killer cops on this list were all convicted of unsettling crimes.