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Tom

There was a survey of drug use among schoolchildren in the UK about 18 months ago, the reporting of which suffered from the multiple hypothesis problem (among many others) quite badly. It was generally reported as 'cocaine use doubles among children of [age group]'. The trouble was, the survey dealt with pretty much all possible drugs, from tobacco and alcohol to solvents to heroin and cocaine. The likelihood is you're going to get an otherwise significant increase in one of those by chance, and that's the one that gets reported.

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