Stuff? What does that mean? If you're referring to the cameras there would be no difference between of an incident videoed by the cops or from the general public. Except when the cop's video gets omitted, erased, and or they'll tell you their video was inoperative. Btw, it's real easy to determine if a video has been altered/edited etc and there are crimes against tampering with evidence.
Btw, based on his reaction, this cop has no business being a cop.
I'm not talking about evidence; I mean the vids that CNN and MSNBC repeat continuously without bothering to verify the editing, or worse, those they edit. The ones they use to rile up the usual suspects and create riots.