A Thai Navy launch travels at high speed down the muddy brown waters of the Mekong River close to the border town of Chiang Saen in the north of Thailand. To the right is Laos, where huge construction projects funded by foreign investment are rising out of the lush undergrowth along the riverbank and ahead to the left are the dense jungles of Myanmar.
This is the storied Golden Triangle where historically opium was grown to produce heroin…