By Sophie Borland for the Daily Mail
Published: 01:45 BST, 4 May 2019 | Updated: 01:45 BST, 4 May 2019
Ministers have set up a Line of Duty-style anti-corruption unit to tackle the epidemic of drug-taking in prisons.
Many inmates are hooked on the psychoactive substance Spice and watchdogs have described the crisis as 'out of control'.
But there is growing evidence the drugs are