I think what happened with the stun gun may be similar to the regulation of pepper spray in places like New York State and Boston. Some people used pepper spray to commit a string of crime -- mostly robbery, as I recall. So then you get the predictable outcry: "Why do criminals have access to weapons?" Before you know it, you can no longer easily get pepper spray. Only certain places sell them, and you have to register to purchase. Mail-order companies cannot ship pepper spray to New York State. You are not allowed to bring pepper spray from out of state, etc.