Example of a 'legal high' sold online
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Government promises 'legal highs' crackdown

9 March 2012 Last updated at 19:04 GMT

David Cameron is promising a further crackdown on so-called 'legal highs'.

They are drugs not intended for human consumption but can be legally sold, and include Methox-etamine which has been linked to the deaths of two people in Leicestershire.

Chris Buckler reports on the popularity of the drug, and - using secret filming - shows how easily it can be bought for personal use.