By David Epstein
July 16, 2013
U.S. sprinter Tyson Gay, who has the fastest time in the 100 this year, admitted on Sunday that he has tested positive for a banned substance.
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Gibson repeatedly emphasized that, "I don't carry anything that's not food-based." But when asked directly if he was saying that he does not refer patients to products containing testosterone, DHEA, or other products often used by anti-aging specialists and that are banned in track and field, he replied: "No, I'm not telling you that. It all depends."

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