Ivory Williams banned after positive test for marijuanaThe American sprinter Ivory Williams has been banned for a period of three months and is expected to miss the World Indoor Championships after testing positive for marijuana after his win in the trial race in Albuquerque.

The sprinter was one of the favorites to land the 60m title in Doha after running a world best 6.49 seconds at the New Mexico meet.

Trell Kimmons has been called up as replacement to the US team.