Personally, if I was a cop, I'd be ASKING to wear a body camera 24/7 now.
But then again, I'm not a cop because I know it's a crazy hard job and that I'd probably just wind up shooting someone for being "1000th person to lie to my face today".
And I'll say it again here as I've said in other places, there should be a "Quis custodiet ipsos custodes?: clause in the law, whereby anyone with authority over something is punished at a category-higher severity than a normal person, when the crime relates to that thing. When a person accepts authority over something, part of that SHOULD BE a higher-than-normal level of responsibility as well.
So for example, a parent would be punished automatically more severely for beating their custodial child, than Joe Citizen would be punished for punching Jim Citizen. A nurse stealing from his patients would be punished more severely than someone just stealing from a random other person. And, in this context, police abusing their authority as officers to extort (for example) would be punished more severely than an unrelated person.
But then again, this will never pass because of course it would logically apply to Congressmen as well.