{What criminals will be wearing. What does it do?, well it takes any I mean any supernatural powers away and making him week like humans and if time to take shower it water proof and unbreakable. Only way it will come off if have key which nobody could get their hands on them cause supernatural cops to powerful and when you cross red line it will shock you and sometimes could knocked you the fuck out and you will feel like shit after word.(For Vamps it's different story, it will turn them into dust.) If collars have to come off you won't have your powers back like that, it takes hour to gain them back but cops put collar back on time.}