The Hanoi police have seized a bunch of pens using disappearing ink that were allegedly smuggled in from China and sold by a local woman.
The Hanoi Police Department's anti-counterfeit unit noticed many online advertisements for the pens.
One use for the pens obviously is in cheating people by writing contracts that disappear soon afterwards.
Officers raided the advertiser, Le Gia T&T Vietnam Company based in Dong Da District, last Saturday and seized nine of the pens.
Le Tien Toan, the company's director, told the police they had been bought from Do Thi Lan, who works for a local transport company.
Later that day they caught Lan, 20, red-handed with eight other pens she was delivering to a buyer in Hai Ba Trung District.
She failed to produce documents showing their source.
The pens, which look like normal ballpoint pens, cost VND300,000-500,000 (US$14-24) apiece and are smuggled in through Mong Cai Town on the Chinese border, the police said.
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