In 1981 (writes Ben Goldacre, Guardian, 7.11.09), studies of rates of change in cannabis use based on national surveys in the 70s found the most rapid increase was in countries with the toughest penalties. Cannabis use in the UK fell after the move from Class B to C. Prohibition of alcohol provides the most famous example of counterproductive control and enforcement. "If you wish to justify a policy that increases the harms associated with each individual act of drug use by creating violent…
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