American basketball star Diana Taurasi’s "B" sample tested positive for doping, a result which threatens her chances of playing for the United States at the 2012 London Olympics. Taurasi’s "A" sample tested positive last month for the banned stimulant modafinil following a Turkish league game on Nov. 13. The Fenerbahce player, who faces a two-year doping ban, had her contract with the club terminated Thursday following the announcement of the positive result on the website of the Turkish Basketball Federation. The federation, however, has yet to make a decision on Tauarsi’s punishment. If Taurasi is suspended for more than six months it would put her 2012 Olympic status in jeopardy. She helped the team win gold medals at the past two Olympics and was the leading scorer at the women’s world championships, which the Americans won in early October.