In the Aurora, Colorado, home invasion, the home owners killed the perp. The people who lived there used proper procedure to call the police. Did the noise of the gunfire to kill the perp temporarily deafen the home owner? Is there a means for the police to better communicate in such a situation? I think using a silencer goes too far. But what about a device that makes the noise something that would not interfere with hearing. There is a big difference between firing a handgun indoors versus outdoors in terms of the noise. In this example, should gun owners...