I'd also add that failure to do so should result in a $1,000 penalty, half of which should go as a $500 reward to anybody who reports the case (photo would suffice as proof). Officers should have their whereabouts tracked via there phones for accountability purposes, which could be used to verify such reports or identify officers.
If an officer who isn’t armed kneels on someone’s neck and kills them, they then wouldn’t be identifiable.