What are legal highs?
Legislation to ban new psychoactive substances in the UK is being rushed, MPs have warned.
The Home Affairs Committee said ministers were not working properly with their own expert drug advisers.
The MPs also said past governments' spending on education about the dangers of so-called legal highs had been "shockingly inadequate to date".
Policing minister Mike Penning said the government would consider the committee's criticism.
The Victoria Derbyshire programme looks at the definition of legal highs, their effects and how they might be controlled.
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