By Adam Clarkson / BBC News

Suzanne Sharkey used to arrest drug users, then she became one. She worked as an undercover officer for Northumbria Police in the 1990s, and was "very happy" locking up users and dealers. "I joined the police because of what they stood for - reducing crime, protecting communities and locking up 'the baddies'," she said.

"But I ended up a 24/7 alcoholic and I used drugs. I was in recovery and I looked around at the people there with me, and one of the biggest barriers I saw to their recovery were drug laws. The criminalisation closed so many doors for them that they couldn't move on with their lives."

Now she is one of those calling for drug policy reform as co-executive director of the Law Enforcement Action Partnership, an activist group made up of current and former justice sector workers.