After joining the Police in the late 1990s, this author soon got chosen to become an undercover officer which he did for over 20 years. Initially going undercover as a 'test purchase officer' where he was deployed as a Heroin addict to target street dealers, he later progressed to the role of a full time 'Level 1' Undercover officer to target drug gangs, murderers, firearms dealers and people traffickers. He has lived as a criminal in some of the most notorious city's in the world, sometimes for years at a time putting his life on the line each time he was deployed. He became one of the UK's most successful ever undercover operatives, taking part in many high profile cases, including the takedown of a notorious serial killer, which all led to him being nicknamed 'The UK's Donnie Brasco.'.