Once again, the BBC is reporting on herbal highs. This time, it tells us that while most legal high pills are based on a group of drugs called piperazines, of which BZP (benzyl piperazine) is the most common and will be banned in the UK under a European directive, it is cathinone, the active ingredient in the plant khat, a widely used stimulant in East Africa that is the focus of today’s news.