Unit 1: Legal highs: The difficulty of enforcing legislation/regulation

The problem is shown clearly by Aljazeera

http://link.brightcove.com/services/player/bcpid1659202292001?bckey=AQ~~,AAAAmtVJIFk~,TVGOQ5ZTwJbsT0Mq3k9H8GCa4jV3vL4M&bctid=3008780245001