Oh yes, and while I'm at it, learn to deal with police officers.
If you are stopped, do EXACTLY what the officer says. No more, no less.
If you are told to put your hands on your head, DO IT and keep your mouth shut.

Do NOT reach for your wallet, argue, say, but but but......because if you do, somebody is probably going to get hurt and it's most likely to be YOU. Stay calm, and say, my wallet is in my back pocket.....and wait for instructions!!!

Police are trained to a) protect themselves first at all costs, and b)minimize the damage to other people. After all, don't YOU protect yourself and yours first? Problem here is that the officers have more resources available to them than you do...both physical and mental ones.