Legal highs have barely been out of the headlines in recent years, with legislation struggling to keep up with the emergence of the latest designer drugs such as mexxy, Benzo Fury and Spice. As the internet makes buying legal highs easy, the challenge of novel drugs is claimed by some to be a ‘game-changer’ in the debate over how society should tackle mood altering substances. Does benchmarking harm offer a rational approach or is it an evasion of the judgemental rationale of criminal law? Filmed at the Battle of Ideas this panel may get you going without taking anything.