For most of us I do not believe that an ID card is necessary. People cannot tell when I switch. But for those people who switch into child personalities, hostile personalities, or go catatonic I believe that a bracelet might be good. Some personalities may not respond to a policeman's orders for various reasons other than disrespect. But, policemen should not use violence anyway if there is not a direct threat. In the media lately it seems that policemen are not being taught that.