Some of them do much worse than that, I remember sometime back one of my friend was busted for having sex in car, the cop handcuffed my friend and took him to his car and told the girl to be remained seated nude in the car. After putting my friend in the car, he returned, molested (fingered) the girl for a while than told her to get dressed and then left them with a warning. They didn't filed a complaint because they knew that they didn't had any proof and the cop got away with it 
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.Oh my god, that's terrible. This is why we should always film police encounters.
Yeah. It's very bad to hear such stories. Hopefully police dashcams can help both prevent & prosecute this things to happen as well as protect officers from false accusation.