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Rise in deaths from 'legal highs' in the UK

12 February 2014 Last updated at 09:40 GMT

The number of UK deaths linked to so-called "legal highs" has risen in recent years - from 10 in 2009 to at least 68 in 2012, figures show.

Researchers compiled post-mortem test results for the National Programme on Substance Abuse Deaths.

Tulip Mazumdar reports.