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.
The 30-year-old Powell, whose 100-meter record of 9.74 stood until Usain Bolt beat it in 2008, was calling for an investigation as to how a stimulant called oxilofrine entered his system and caused a positive test at Jamaica's national championships in June.
Simpson, who tested positive for the same stimulant, said she "would not intentionally take an illegal substance of any form into my system."