Seven Thai women were arrested at an airport in Japan after they were found with blocks of METH shoved up their vaginas.
The women were acting suspiciously when they arrived at the Fukuoka airport on September 30, before frisked by security.
Japanese police strip-searched the women, all aged between 20 and 50, and found more than 1kg of methamphetamine in tightly wrapped packages, stuffed in their knickers.
Some of the shipments were wrapped in condoms and inserted into their vaginas while others were hidden behind sanitary pads.
The smugglers claimed that they were working for an African drug dealer in Bangkok to smuggle meth out of Thailand by disguising themselves as normal tourists.
Niyom Termsrisuk, head of the Narcotics Control Board, said Thais now face extra checks when travelling to Japan.
He said he is worried about the relationship between two countries after several cases of attempted drug smuggling.
He said: “For those travelling into Japan, please note that Japanese authorities are now hyper-vigilant about drug smuggling into the country especially by visitors travelling from Thailand.
”There have been 37 Thai people from 20 cases who were arrested for drug smuggling in Japan so far this year and this might affect the good relationship between two countries.
“We are trying to work with the Japanese authorities to trace the leaders of the drug gangs who are behind the smuggling.
“I additionally want to warn Thai people to be more careful when travelling and do not participate in these drug schemes, as sometimes their trick is to offer a free trip in exchange for concealing the drugs.”