Countries in Southeast Asia are coming together with the support of the UN to tackle what is being described as “one of the biggest drug-trafficking corridors in the world.”

Traditionally, the highly addictive drugs, opium and heroin were trafficked out of the region, but now more dangerous synthetic drugs are being manufactured in remote jungle laboratories in ever larger quantities.Closer collaboration across borders between law enforcement agencies is helping to slow down the illegal trafficking.

Daniel Dickinson travelled to the north of Thailand for this special edition of The Lid Is On.

Production credit: Pauline Batista, Music credit: Ketsa 'Within the Earth'