For some time now, England and Wales have had a semi-decriminalisation programme for cannabis. And it has ended up criminalising more cannabis users than ever before. But it doesn't criminalise all cannabis users: it primarily targets people who are young, black or Asian. It is a story of muddle-headed government initiatives, skewed police incentives, racism, drug wars and the old, old habit of treating white people more leniently than everyone else. In 2004, when cannabis was made Class C, cannabis warnings were introduced. These were spoken warnings given by a policeman on the street if you were caught with a small amount of weed for personal use. Five years later the drug was returned to Class B, but the cannabis warnings remained. This effectively gave the police discretion in how they treated cannabis possession. The result of this discretion has been s the disproportionate targeting of black and Asian youths.