True, but then you have to take into consideration the amount of bullets left in the gun. Lets say a police officer sees a zombie and pulls out his gun, m'thinks the first thought he'll have won't be to aim for the head but to instead give a warning shot or aim for the legs. If I found a gun lying on the ground then it would most likely be empty. xD

Then again, are these slow zombies or fast zombies? If they're fast, I think anyone with a gun wouldnt get the chance to fire off a shot. Urgh, thinking too much into it. ;_;