A Thai woman was arrested at Chiang Mai International Airport on the weekend carrying 4.2kg of crystal meth, which had a street value of well over Bt13 million.
Siwaporn Sriphumichon, 27, has pleaded guilty. She said she was paid Bt30,000 to carry the drug from China's Guangzhou to Thailand via Hong Kong.
The drug was found hidden inside strollers Siwaporn had carried after her flight from Hong Kong landed in Chiang Mai on Sunday.
"It's the first time I've done this," Siwaporn said.
A native of Chachoengsao, she said she met the person who hired her via an Internet-based chat programme.
Anti-narcotics officials suspect Siwaporn's case might be linked to a transnational drug-trafficking network. About a week ago, an Indonesian travelling from Guangzhou was also arrested at Chiang Mai Airport for smuggling 2kg of crystal meth.