Well as under 18's are not going to be put through it, it's a farce really and another hole in the supposed system, there are plenty of would be 17 year olds bombers out there.
I suppose what you need if someone to start printing teeshirts or vests using the likes of lead or metallic based paint with comments on such as "F off Nosey" or the like
after all it is concealed under your shirt etc
I Suppose we will now get hit by a burgeoning industry of tin foil underwear etc lol
I can seriously see this getting abused and no doubt will end up with another stupid TV programme like the Police stop dross we are subjected to in the name of so called entertainement.