The list reads like a Who's Who among the world's best sprinters:
Jamaican Asafa Powell, the former world-record holder at 100 meters. American champion Tyson Gay, who went out of his way to promote himself as an anti-drug athlete.
Jamaican Sherone Simpson, who has a gold and two silver Olympic medals to her credit.
Word came Sunday that all three had failed drug tests. "A sad day," one former track official called it - and certainly a day that punctured the myth that the oft-troubled sport has cleaned up its act.
"I am not now - nor have I ever been - a cheat," Powell said in a message released through his Twitter account.
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