EVERYBODY thinks body cameras on police will solve any questions of guilt, but the police will do ANYTHING to avoid implication. And they "rationalize" it by convincing themselves that we are ALL the "bad guys" and they are ALL the "good guys" and that they have the right to delete evidence against US because we are ALL liars anyways.
They did it to me. They deleted the dispatch tape claiming "mechanical malfunction" despite the fact that the portion before and after my incident was intact. So what's to stop them from simply NOT turning the body cameras on or deleting after-the-fact?