Legal highs clampdown 'failing' says Centre for Social Justice
1 September 2013 Last updated at 08:39 BST
Government efforts to clamp down on the sale of substances known as legal highs are failing, according to an independent think-tank.
The Centre for Social Justice, a group set up by the Conservative MP Iain Duncan Smith, says the UK is now one of the leading hubs for buying and selling the products on the internet.
John Ironmonger reports.