Legal highs
Media playback is unsupported on your device
Video

Legal highs smuggled into Midlands prisons in letters

Scientists say legal highs are being smuggled into prisons in letters to inmates.

Bio-chemists at Sandwell Hospital have analysed correspondence from five jails in the Midlands.

They found sheets of paper soaked with psychoactive substances.

It's thought that once inside the prison they can change hands for hundreds of pounds.

Go to next video: Legal highs in prison 'getting worse'