Last month’s arrest of one of Asia’s most wanted men - Tse Chi Lop - may have dented Southeast Asia’s multibillion dollar drug trade. But with major money to be made, the cartel’s main product—methamphetamine -- keeps flowing and Thailand is on the front line to stem that flow. For VOA, Vijitra Duangdee reports from Bangkok. VOA Khmer's Leakhena Sreng narrates the story in Khmer.