Warders at a single prison dealt with up to nine overdoses from 'spice' in just one day.
The outbreak during an epidemic of the drug was featured in a TV documentary series filmed over seven months inside HMP Durham.
Security - Rules - Money - Phones - Inmates
Despite strict security and rules barring money and mobile phones, inmates still managed to trade in drugs. In the three-part series, prisoners revealed how they hide and sell spice, and use other inmates to test the strength of their stock.
They also told how they hide phones by swallowing them.