Shaun Bailey, the Tory candidate for London mayor, has condemned “polite” drug use by professionals. If Bailey wins the election next May, every company with more than 250 employees will be expected to sign a drug-testing charter, with regular tests and the results published to name and shame the worst companies. “There is a responsibility for polite drug users to have a look at themselves,” Bailey says.

He hopes this will stamp out middle-class cocaine use and the role this plays in fueling gang violence. Which raises the question, exactly what is “polite” cocaine use? And just how common is it?

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