this has been gone over in another thread but the bottom line is this:

IF a police officer feels their life is in danger they have a literal license to kill. Shoot first, ask questions later type thing. So........if you are ever stopped by a cop and during the exchange you hear the cop say something like "I am in fear for my life", chances are he/she is going to reach for their firearm and take care of the threat, perceived or otherwise. After an incident of this type, the cop is placed on paid administrative leave so that they can work out their feelings/emotions about the shooting. Meanwhile, you or your pet may not have the luxury of working out your/their feelings.