The information was revealed by senior lieutenant colonel Ha Ngoc Viet, head of border guard station at Cha Lo international border gate.
Customs officers and local police arrested Dau Xuan Cuong, born in 1991 in central Nghe An province, and seized 495 pills of synthetic drug.
Cuong admitted that he packaged the pills of synthetic drug in his luggage and took a car from Laos to Nghe An via Cha Lo border gate.
Relevant agencies are broadening the scope of investigation into the case.