If someone has their heart set on becoming criminal and harming another laws will not hamper them. Thats why they are criminals. But see if there is and proof in this pudding, put it on the market and see if anyone buys it.Now add in that there have instances where someone was shot and incapacitated and another person was able to retrieve the person's weapon and stop the criminal.
Plus; people don't usually wear bracelets, all the time, what are they supposed to do in the middle of the night.
Better idea.
Anyone who doesn't own a gun needs to have a chip implanted in both hands that will render a gun inactive, if they attempt to use it.