(FILES) -- A file photo taken on March 10, 2012 shows Morocco's Mariem Alaoui Selsouli posing with her silver medal on the podium during the medal ceremony for the women's 1500m at the 2012 IAAF World Indoor Athletics Championships at the Atakoy Athletics Arena in Istanbul. Selsouli, one of the favourites for the Olympics 1500m gold medal, has failed a drugs test and has been ruled out of the Games, a source with knowledge of the case said on July 23, 2012.    AFP PHOTO / MUSTAFA OZER        (Ph
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