Police don't even do this. If I am a gun owner and I want to go buy a new gun, I am under more strutany than a police officer who received his training and psych evaluations 20 years ago. Disallowing guns won't stop violence, but it will make for an easier police state. While I am not a gun owner, I do think it's a little amusing that a few bad people (comparative to population) have used guns for harm and now after centuries they are bad. No one had an outcry during the olympics rifle competition - so does that mean only "good people get guns"? It's a no win argument on both sides.