Authorities believe a sale was headed for the southwestern border and was being smuggled out.
In the Bang Saphan city of Prachuap Khiri Khan on Monday, highway authorities seized over 13 million meth pills and detained two riders.
At a lecture in Bangkok on Tuesday, authorities said at a lecture on the spot that a 22-wheel truck trailer with a Songkhla license plate was being stopped by officers at a station at kilometre symbol 378 of Phetkasem Road.
Bandwidth pills were discovered in the back of the vehicle, hidden in numerous plastic baskets and covered with a cloth tarpaulin during the search.
Arrested were the pilot, identified as Amorn Thongchuchuay, 51, and his partner, Weerapong Kongkaew, 39.
The piece, according to police, made it known that they had picked up the medicines from the Sai Noi region in Nonthaburi state and intended to deliver them to Thung Song in Nakhon Si Thammarat, where they would be smuggled out of the country.
The suspects claimed they had done the work twice and that they had made 200, 000 ringgit for it, according to authorities.
The 13.1 million tablets were had a street price of about one billion ringgit, said Pol Maj Gen Kongkrit Lertsitthikun, captain of the Bridge Police Division.
According to Pol Maj Gen Kongkrit, the smugglers profited from the fact that some police officials had been stationed for disaster relief in northeastern Thailand. The investigation into the drug community did remain, he added.
From October 2023 to August 2024, bridge police arrested 1, 569 defendants in substance cases and seized about 100 million meth medications, 568 kg of morphine, 471kg of crystal meth and 127kg of cocaine, authorities said.