It has to be an organization separate from any specific police agency, with prosecutors solely devoted to prosecuting police crimes, complete with their bonuses

It has to be an organization separate from any specific police agency, with prosecutors solely devoted to prosecuting police crimes, complete with their bonuses and careers linked to convictions complete with scummy plea bargaining behavior. There also has to be new crimes of negligence for things like 'body cam turned off' or 'records suddenly missing' and so on.