The ban took effect on September 18, 2010, after Tuan's "A" and "B"samples both tested positive at the world weightlifting championshipsthat month in Turkey .
He was also fined 5,500 USD for infringement of drug rules and the cost of the tests.
Tuan, who subsequently missed the Asian Games in Guangzhou , China ,last November, claimed the banned substance may have been in medicineshe took for flu during training last May in China .
Since Viet Nam does not have a weightlifting federation, the finewill be paid by the Vietnam National Sports Administration.
Tuan is Vietnam's best ever lifter and has won silver medals at the 2008 Beijing Olympics and 2006 Asian Games in Doha, Qatar.
He also won bronze medals in the 2005 and 2006 world championships./.