The last police shooting in this area was a total farce of the dangerous kind.
Guy robs convenience store and a cop happened to be on scene. To make a long story short, other cops arrived, and the robber tried to shoot the officers. Three of them returned fire and hit the BG a total of four times, though none of those hits in and of itself would have been instantly incapacitating. In total, however, they were good enough to get him into custody. The officers fired over TWENTY rounds and ended up with less than 20% hits. The store windows, doors, and walls were hit, as was the window of an apartment three blocks away.
The bad guy was out of the hospital and into jail within five days. I don't think bad ammo was to blame, nor was bad training. I do think adrenaline had a lot to do with the poor marksmanship, but I believe that other, strictly psychological factors were more relevant.