Why stop there? Wanna pack a handgun? OK. First, outlaw concealed weapons, except for law enforcement, etc. Next, all handguns must be open carry, and visible. Then, mandate that the only handgun that can be legally open carried is the Smith and Wesson Model 500 .50 cal. handgun. The thing is a 5 load revolver, 15 inches long overall, and loaded, weighs in at 5 lbs. 
It's visible. Very visible.Not the type of handgun that you can tuck in your waistband. Can be carried on a shoulder strap as well. What's the point of a deterrent if no one can see it??