Two alleged members of a major northern drug network were arrested and narcotics worth some 25 million baht seized in Chon Buri, police said on Tuesday.
Supoj Taengchang, 38, and Ms Saithong Taengchang were taken to a police press conference at Provincial Police Region 2 on Tuesday.
Officers recovered 108,000 speed pills, 1.7kg of crystal methamphetamine, a 9mm pistol and 18 rounds of ammunition.
The arrest came after an informant posing as a customer contacted the pair to buy 2,000 speed pills. When Mr Supoj showed up in tambon Nongree in Chon Buri's Muang district, officers arrested them, said Pol Maj Gen Chettha Kamolwattana, investigation commander at Region 2 police.
Mr Supoj claimed the drugs belonged to Ms Saithong, his younger sister. He then took police to her house in Bang Bung district where a large quantity of ya ba and ya ice were seized.
Police investigators said the pair were members of a major drug network in the North operated by a woman known only as Jae Yai.