They hid a total of 25 packs of wet tissues in their backpacks and such, one of which contained about 366 grams of stimulants (worth ¥21 million). The total amount they tried to smuggle is estimated to be about 9.2 kilograms (worth ¥530 million). The two arrived at Sendai Airport from Malaysia via Taiwan and the customs branch found the stimulants on them. Following a complaint from customs, the prefectural police arrested the two on 15 May.