The governor of a Teesside jail says there's been a significant drop in the number of prisoners testing positive for the drug Spice.
In 2017, staff at Holme House prison in Stockton were exposed to the drug 140 times - more than four times as often as any other medium security jail in the country.
Five kilos of the drug were discovered at the jail during the same year, hidden in cereal boxes.
Governor Chris Dyer says they were averaging about 30% of tests for the drug coming back positive and that is now down to about 10%.
"So a significant reduction that's played out in a reduction in violence and self harm within the prison," he says.
"We've put in a lot of security but we've also put in a lot of the demand reduction and the continuity of care element for people going out of the prison."