Sunday I asked a cop at the gun range who was there practicing if warning shots, or shots to disable someone are ever taken, and he said absolutely not. I then asked him about the whole MB thing, and he said once an officer decided to shoot, that they shoot until the person is stopped, whatever that takes.
Eta: very nice officer btw, even helped me attach my new scope on my AR.
Yes, police don't do warning shots. Warning shots could easily hit a bystander so that is not acceptable.
Also why they are trained to shoot into the center of the body as opposed to an arm or the leg. So the bullet doesn't miss and doesn't hit a bystander.