system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why don’t the FBI or other 3rd party agencies investigate cases of police misconduct, wouldn’t this cut down on “no evidence of wrongdoing” reported by departments investigating their own people?
gpt
They do. The FBI has a big public corruption unit. 

In cases like police brutality or racial bias the justice department also investigates but since rules about police brutality are written at the state and county level there’s not much the justice department can do except work out what’s called a consent decree where a department acknowledges they should change their ways because otherwise they might lose federal funding.