hmm, I'd say eyewitnesses, camcorders and the court of justice. 'cause if a violent cop gets convicted he will not continue his abuse (as a police officer). but you're right, there isn't police's police. if a mob of angry cops come to arrest you, and you killed a cop prior, you're pretty much screwed.
I saw a video once where a cop kicks an evading suspect and his dashcam recorded it, the cop got fired and convicted. In the video another cop went between those two and took the suspect into custody, saving a couple of broken ribs. So not all cops are violent and abusive.

yes you are right man, i guess i only bumped into the bad ones...and u know this is always difficult to talk about a country that is not yours...i mean i only hear the bad sides of your police cos this is the only thing that creates the buzz around the world...it's true that when we hear stuffs about american police this is always to highlight their abuses and brutality but that's true that i don't know how is it to be a cop in the usa...and i don't really want to know it...too many fucked up psychopath....
in a nutshell, we agree on some points and disagree on others, which is good...actually, in europe this is very very rare to see that a cop has been fired or just reprimended...Ok may be if he killed an innocent youth, this cop will have to change of police station or go in a little red neck town but that's it, no more worry for him..and this is fucked up

Funnyiest episode of cheaters I've ever seen.

I didnt know dogs like chicken legs,lol

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wonder what he had for tea the night before that made those pants so irresistable to the dog!!!