In the UK, it is now illegal to sell and possess the class B drugs mephedrone and other related substances, previously known as legal highs.
(It is now a class B drug in the UK, and so there will be a maximum penalty of five years imprisonment, an unlimited fine for possession and 14 years imprisonment and an unlimited fine for supply. Slang names for the drug include meph, MC, MCAT, m-cat, 4-MMC, meow meow, bubbles, bounce, charge, drone and white magic. Of course people who don't care what they put in their bodies as long as they feel better about themselves for a few minutes will still buy it, it will just cost them more.)