	"Ya ba" tablets were formerly sold at gas stations and were commonly used by long-haul drivers to stay awake. After many horrific long-distance bus accidents, they were outlawed by the Thai government in 1970. The deposed Prime Minister Thaksin Shinawatra's campaign from 2003 to eliminate drug-trafficking further helped to curtail widespread use. In particular, use of the drug by bus drivers and truckers is not as widespread as it was in the 1980s.