According to the Intercept,

Last month, the city public defender’s office discovered body camera footage showing a local cop placing a bag of heroin in a pile of a trash in an alley. The cop, unaware he was being filmed, walked out of the alley, “turned on” his camera, and went back to “find” the drugs. The cop then arrested a man for the heroin, placed him in jail. The man, who couldn’t afford to post the $50,000 bail, languished there for seven months. He was finally released two weeks ago, after the public defender’s office sent the video to the state attorney.

So, I think I support the body cameras, I don’t really see why honest police officers wouldn’t support them too. Maybe they shouldn’t even have an “off” button.