Michael Phelps
Performance-enhancing drugs testing

During the 2008 Olympics, Phelps was questioned by the press as to whether perhaps his feats were "too good to be true", a reference to unsupported rumors that Phelps might be taking performance-enhancing substances. In response, Phelps noted that he had signed up for Project Believe, a project by the United States Anti-Doping Agency in which U.S. Olympians can volunteer to be tested in excess of the World Anti-Doping Agency guidelines. During the Games, Phelps passed all nine tests that were administered to him.
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