Police intercepted an attempt to smuggle 600 kilogrammes of marijuana from Mukdahan to Ayutthaya and arrested four suspects.[1] Officers stopped the four at a police checkpoint at a traffic flyover in Muang district, Nakhon Ratchasima.[1] Deputy Police Commissioner-General Jongrak Juthanon and Provincial Police Bureau 3 Commissioner Krissada Phankhongchuen announced the arrest at a press conference on 21 May 2009.[1]

The four were identified as Thawee Phosim, 43, Adulsak Khampila, 40, Thiwa Jungjun, 25, and Tim Phosim, 47.[1] The drug was hidden inside a Toyota van.[1] Thawee told police the group had been hired to deliver the drug to a person in Ayutthaya for 15,000 baht.[1]