A blanket ban on so-called legal highs has come into force in the UK.

Legal highs are psychoactive drugs that contain various chemical ingredients, some of which are illegal while others are not. They produce similar effects to illegal drugs like cocaine, cannabis and ecstasy.

Last year legal highs were linked to more than 100 deaths in the UK and a rise in violent assaults in prison.

http://www.bbc.co.uk/news/uk-36384729

http://www.bbc.co.uk/news/uk-32857256