American world indoor sprint favourite Ivory Williams has tested positive for marijuana and ruled ineligible for the world championships in Doha this weekend, costing the event one of its key match-ups.
The U.S. Anti-Doping Agency says Williams had tested positive for a metabolite of marijuana at the U.S. indoor championships in February and had been disqualified from all results at the meeting, thus nullifying his chance to compete in the world championships.
He also accepted a three-month period of ineligibility, which can be reduced to time served upon completion of an anti-doping educational programme.
Williams had been expected to meet British European champion Dwain Chambers over 60 metres in one of the highlights of the indoor championships.
The 24-year-old former world junior champion ran the fastest 60 metres in the world this season, 6.49 seconds, to win the American indoor title on Feb. 28 in Albuquerque, New Mexico.