@Dominions Son
There are a number of incidents I recall that make me wonder how much in the way of friendly fire incidents police departments around the US are hiding.
I'm sure there's tons. Usually, I'd bet they try to pin the pig's death on whoever the cops were shooting at. (Hell, the felony murder rule actually makes that easy. Doesn't matter why the cop died, just that he died during the commission of a felony count of resisting arrest.)
But as to cop shooting accuracy, I recall a show from the early 90s - The Commish. One episode, the main character spouted off about how well his cops trained with their weapons, and was challenged on it. So he had to run a specific route in a set time to get to the range and stop and fire as rapidly as possible. Barely hit the paper, let alone the target. So then everyone had to try, and the results were equally pathetic. (Then, he actually made that routine required training, and required all patrol officers to attain at least reasonable proficiency quickly, and this being a TV show wasn't immediately shut down by the union for imposing things not collectively bargained on.)
But the point is, for all you hear about all the cops who only ever fire their weapon when they have to (re)qualify with it at the range, how many of them would actually be able to actually run until they were winded, and still hit the target they intended to shoot? For that matter, how many would make the right decision about who to shoot and who not to?