You pretty much have to catch cops on camera doing stuff like this before anyone in the general public will believe that it happens. Mostly cops can get away with it anytime they want. Their superiors and fellow officers teach them how to write reports that few will question, and judges are often willfully ignorant if not complicit in the fact that cops engage in this type of behavior. Similarly, the general public loves to keep cops on pedestals and sleeps so much better believing they are guarded and protected by morally superior supermen who will gladly take a bullet for them. Give me a break. A cop's first goal is to go home to his family, and most of them could give a shit less.