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Page last updated at 10:30 GMT, Tuesday, 12 May 2009 11:30 UK

Cocaine 'less pure than before'

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Figures obtained by the BBC suggest almost a third of cocaine seized by police is now less than 9% pure, the lowest recorded purity level.

Joy Newman from the Forensic Science Service explains how drug gangs are using increasing amounts of chemicals to dilute cocaine powder.

She spoke to Mark Easton.

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