Mou arrived at
Changi Airport (to catch an onward flight to Zürich) at around midday on 29 August 1991, where her strange behaviour drew the scrutiny of
Customs officer Suriati Mohamed, who was standing less than 20 meters away from Mou at the customs counter green lane. At baggage conveyor belt number 17 on the West wing of Terminal 1, Mou picked up her
duffel bag but then hesitated and dropped it, allowing the bag to go around another time before picking it up. After Mou put her bag on a
luggage trolley and started wheeling it towards the exit of the Arrivals hall, she was stopped by customs officers Brahim and Mohamed, who asked Mou to open her bag for an inspection. Her nervous demeanour raised the suspicion of the officials, and after customs officer Mohamed inspected the bag she realized she could not run her hands down to the very bottom of its inside. The plastic packaging of the larger compressed bricks were stamped with the "Double UO Globe" logo, which was known as a trademark of the
Khun Sa drug trafficking organization. Mou was then arrested and handed over to the
Central Narcotics Bureau, led by officer Ong Peng Beng. When
interrogated by officers at the scene about the narcotics discovered in her luggage, Mou mostly
remained silent. However, she did state that the bag was given to her by someone else and she did not know what was inside. Mou was searched and found to have a large amount of cash in various
currencies, amounting to
$US3,000,
HK$5,720, and
S$1,055. She was then escorted to
Tan Tock Seng Hospital for a medical check up, and afterwards gave a recorded statement to CNB officer Ong via a
Cantonese interpreter at about 4:30pm. In her statement, Mou claimed that she paid for the bag at a roadside market in Bangkok and that it was later delivered to her hotel room by the same salesgirl she bought it off, who then helped Mou pack her things into the new bag. ==Trial==