Ketamine was designed as an anaesthetic but its use as a recreational drug is growing fast, particularly among young people. In the UK, it’s doubled in less than ten years but it can cause serious side effects. The supply chain for the drug starts with pharmaceutical manufacturers in India then involves criminal gangs in Europe who use front companies to legally import vast quantities of the drug before flooding it onto the illegal market in the UK. Paul Kenyon investigates the trade.

This episode of The Documentary, comes to you from Assignment, investigations and journeys into the heart of global events.