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IAAF: Latest cases aid credibility of doping fight

Updated: July 15, 2013, 6:18 AM ET
Associated Press

LONDON -- The credibility of track and field's anti-doping program has been "enhanced, not diminished" after sprinters Tyson Gay and Asafa Powell tested positive for banned substances, the IAAF said Monday.

Gay, a former world champion who won the 100- and 200-meters at U.S. nationals last month, said he would pull out of next month's world championships in Moscow.

Powell, who held the world record in the 100 until Usain Bolt lowered it in 2008, and Olympic gold medalist Sherone Simpson ...

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