The House of Commons will today debate whether to rethink the war on drugs. While it is only a backbench business debate, and is therefore not binding, it still represents a step towards reviewing the UK’s drug laws. There is a simple reason why the UK’s drug policy is so expensive and ineffective: the law is so old. Policy is still dictated by the 1971 Misuse of Drugs Act, signed into law shortly after the 1971 UN Convention on Drugs. In 43 years since, the approach has failed catastrophically.