Along the same lines, how about the "metadata" is put up on a public website immediately. For example, as soon as one of the police cameras start recording, there would be a log entry on a public website which would show activation time, officer who activated the camera, and termination time, plus a checksum for the newly completed video. That way, when evidence is needed, we can tell if the video has been edited/altered, and there is also a public record of who and when the camera was used. Then the officer can't simply say "we weren't recording during the altercation" or whatnot. You would also be able to see if the camera was activated while approaching someone, then switched off for 5 minutes, and then reactivated and now there is a guy bleeding on the ground. Any arrest made without a complete record, could be tossed out.