The arrest of Montree Piyaphan, 30, and Ae (real name withheld), 17, was announced at a press conference at the Provincial Police Bureau 6 by the bureau deputy chief, Pol Maj Gen Chavalit Charnvej, on Thursday.

Phitsanulok police were alerted by Chon Buri police that parcels of marijuana were being mailed from their district.

Police learned that Montree used a private post office in Tambon Plaichumpol in Mueang district to send parcels every month.

Chavalit said Montree admitting that he has been selling between 150kgs to 200kgs of marijuana a month for between Bt6,000 and Bt8,000 per kilogram. He said he bought the drug from a seller in a northeastern province for Bt4,000kg.