Chinese drug police are working with Mekong countries to strike at the heart of a mega-rich meth syndicate, a senior Beijing drugs tsar said, as the region targets top-level drug traffickers instead of street dealers.The porous lawless border areas of Myanmar, Thailand and Lao have for decades been a hub for heroin production, but the so-called "Golden Triangle" drug trade is now pumping unprecedented quantities of synthetic drugs into the global markets – fuelling a US$61 billion d