A UN report says the use of synthetic drugs is worsening in south-east Asian countries.
In Thailand, police made more than 84,000 methamphetamine related arrests in 2007, the highest in five years.
Thai police are struggling to crackdown on the illegal drug trade despite the country's stringent anti-drug laws.
Youngsters are being exploited by the drug gangs in Thailand because as juveniles they escape serving adult sentences.
Al Jazeera's Selina Downes reports
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