Possibly, but let's be honest, decent, upstanding chaps like you and me aren't going to be stopped and searched, are we? That's going to happen to feral street rats for whom possession is the least of their offences.
Of course, that whole nonsense could be overcome by simply legalising or decriminalising drugs. We really are a long way behind much o the western world on this now. It's embarrassing when large chunks of the United States have a more enlightened approach to drug use than we do, ffs!