The deposed Prime Minister Thaksin Shinawatra's campaign from 2003 onwards to eliminate drug-trafficking has further helped to curtail widespread use, in particular, use of the drug by bus drivers is not as widespread as it was in the 1980s.
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Burma (Myanmar) is the largest producer of methamphetamines in the world, with the majority of ya ba found in Thailand produced in Burma, particularly in the Golden Triangle and Northeastern Shan State, which borders Thailand, Laos and China.