There will always be those in positions of authority that abuse it and criminals and mental defectives are everywhere in all proffesions. I think it would be incredibly enlightening if all peace officers across the nation had their DNA entered into the FBI database..............and run against crimes. After all isn't the classic line they feed suspects 'if you haven't done anything wrong you have nothing to worry about'?
I bet there are by percentage few, but by number quite a few peace officers that do have something to worry about.
Oops! Did I just propose a 'police state'?