That revelation came Sunday, within hours of more bad news for track and field: Asafa Powell, the one-time world-record holder at 100 meters, and his Jamaican teammate, three-time Olympic medalist Sherone Simpson, tested positive for prohibited stimulants.
A sport that vowed it had cleaned itself up after decades of stories about disgraced, drug-fueled sprinters Ben Johnson, Marion Jones, Tim Montgomery, to name a few found itself in a very similar spot after this latest flurry of doping cases.
"A sad day," said Doug Logan, the former CEO at USA Track and Field. "But I don't see anything on the horizon that says this will be abated in any way."
Gay chose to withdraw from next month's world championships while his case plays out; the next step is a test of his "B'' sample, which could come as early as this week. Simpson's and Powell's status remains in limbo. Simpson was eligible for the 100, while Powell was waiting to see if he'd make the relay team.
"Will this be a cloud over [worlds]? I think it would be naive to say otherwise," said Ato Boldon, a four-time Olympic medalist and sprint analyst. "I sat down and thought about the events I'm looking forward to. There are people who are not there, for all the wrong reasons. ..."
Logan recently wrote a column arguing that the fight against performance-enhancing drugs in sports should be surrendered because, in his view, anti-doping rules make very little headway against a problem that never seems to disappear. He said Sunday's onslaught of failed tests only bolstered his point.
The sprinters, meanwhile, offered apologies while also claiming extenuating circumstances.
"I am not now nor have I ever been a cheat," Powell said on his Twitter account.
The 30-year-old sprinter, whose 100-meter record of 9.74 seconds stood until Jamaican teammate 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."
Gay was more contrite, though he also wasn't taking full responsibility.
"I don't have a sabotage story. I don't have any lies. I don't have anything to say to make this seem like it was a mistake or it was on USADA's hands, someone playing games," said Gay, who fought back sobs in a telephone interview. "I don't have any of those stories. I basically put my trust in someone and I was let down."
Gay was healthy again this season after being plagued by hamstring and groin ailments, along with a bad hip that required surgery.
He conceded this news would be tough for his fans.
"My reputation," Gay said, "has always been honest."
The 30-year-old, who won the world championship in the 100, 200 and 4x100 relay in 2007, took part in the U.S. Anti-Doping Agency's "My Victory" program in which athletes volunteer for enhanced testing to prove they're clean and his results never raised red flags.
That changed after results of an out-of-competition test on May 16 came back positive.
Neither Gay nor USADA CEO Travis Tygart would identify the banned substance.