Back several years ago, in my mis-spent youth, I knew several fellows from a local motorcycle club. They all had a bandanna loop sticking out of a pocket - back pocket, front pocket, whatever. There was a padlock tied to the other end of said bandanna.
Others carried ball-peen hammers. Hard to outlaw a tool like that, at least back then. Or, those 6-cell Maglights that were half hand torch, half persuader.