So rules a state judge in Bay City, Michigan. According to the ruling, the regulation of stun guns would be constitutional, but not their prohibition. Other than Michigan, the only states that prohibit stun guns are New Jersey and Rhode Island.
Eugene Volokh’s Stanford Law Review article, Nonlethal Self-Defense examines the Second Amendment issues involving stun guns, chemical sprays, and the like, concluding that they are protected by the Second Amendment.