Police seized more than six million methamphetamine pills from a suspected drug trafficking truck in northern Thailand.

Officers stopped the six-wheeled pickup truck at a checkpoint in Chiang Mai province, in the early hours of August 25.

The driver Chakkaphong, 42, reportedly exhibited 'suspicious behavior' as police inspected the vehicle and noticed strange modifications to the vehicle's cargo area.

When they climbed onto the truck, police detected a strange odour and discovered a hidden compartment next to the driver's cabin. Inside were 20 sacks stuffed with millions of meth pills.

Police arrested Chakkaphong and seized the illegal haul. They said the checkpoint was set up after receiving intelligence about traffickers smuggling narcotics from the border deeper into Thailand.

Police Colonel Suparb Koenkaew, superintendent of Mae Chedi Police Station, said: ‘The suspect was still testifying incoherently and did not cooperate much with us. We handed him and the seized items to the inquiry officer for further legal action.

‘Currently, we are expanding our investigation to arrest his accomplices for prosecution.'

Chiang Mai sits along the Golden Triangle, where most of Southeast Asia's meth supply comes from.

The region is found where the borders of Thailand, Laos, and Myanmar meet but it has long been a feral nest of criminal activity, including opium production, meth labs and call centre scam bases.

At the heart of the Golden Triangle lies the Golden Triangle Special Economic Zone (GTSEZ), run by notorious Chinese business tycoon and suspected crime boss Zhao Wei in the Chinese vassal state Laos. Communist chiefs are said to turn a Nelsonian eye to his wrongdoing.

In 2007, Zhao brokered a deal with the Laos government and obtained a 99-year lease to build the zone on a 39-square mile patch of impoverished Bokeo province.

The Chinese businessman claims to be a benefactor as he touts the GTSEZ as a tourist and economic hub designed to bring more income and investments into the country. However, both local and international law enforcement agencies believe it is a front for organised crime, including human trafficking, drug trafficking, and call-centre scams.

International authorities have struggled to take down the gambling empire as the Laos government itself is said to be protecting the GTSEZ, in which it has a 20 per cent stake.