Anti-Doping Agency of the positive test last week.
Gay, 30, told The Associated Press that he was notified by the U.S. In a separate development, former 100-meter world record holder Asafa Powell (above left, with Gay) was one of five Jamaicans announced to have failed a drug test.
Tyson Gay, the American 100-meter record holder, said he has tested positive for a banned substance and will not compete in next month's world championships in Russia.
