Monkey Dust: The Volatile Drug's Grip On Stoke
Crown Prosecution Service to review Act.
The number of inmates with a drug problem at the prison has increased by 10%.
'This ban is increasing health harms and criminality.'
'The poppers were seized in error in good faith.'
The ban on psychoactive substances was meant to come into force in April.
Campaigners say it shows the new law is 'badly drafted'.