This is one of my fav websites cool gear and interesting news. Scroll down for video of what happens when you dont follow instructions after say about 20 commands from an officer.
http://www.tacticalshit.com/video-you-reach-for-that-gun-ill-blow-your-brains-out-he-does/
http://www.tacticalshit.com/video-you-reach-for-that-gun-ill-blow-your-brains-out-he-does/