Germany's Evi Sachenbacher-Stehle has left her country's Olympic contingent — and Sochi — after testing positive for a banned stimulant. She's seen here in the biathlon earlier this week; Sachenbacher-Stehle finished fourth.
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Shortly after winning this race, Tyson Gay acknowledged failing a drug test. He is believed to have used a cream provided by an anti-aging specialist whose clients include several NFL players, reports ProPublica.
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American cyclist Chris Horner celebrates winning Spain's Vuelta bicycle race Sunday. Anti-doping officials say that Horner, who at 41 is the oldest ever to win one of cycling's top events, was not at the hotel drug testers visited.
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There were no positive doping tests during the 2013 Tour de France, officials say. Here, Chris Froome, the overall winner, steps into the anti-doping control bus after a stage in the race.
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Despite already being in the Hall of Fame, New York Yankees legend Mickey Mantle was banned from baseball in 1983, for his work for a casino. He was reinstated in 1985. MLB suspended Yankees third baseman Alex Rodriguez for 211 regular season games Monday.
The 2013 Tour de France is breaking with several traditions, as it starts with a sprint stage on Corsica Saturday. Here, American Tejay van Garderen, 24, second from left, trains with his team on the island.
In a lawsuit filed against Lance Armstrong on Tuesday, the Justice Department said the disgraced Tour de France winner "unjustly enriched" himself through his contract with the U.S. Postal Service.
Lance Armstrong, right, faces several court cases tied to evidence that he cheated. One of the suits was filed by his former U.S. Postal Service teammate Floyd Landis. Here, the pair ride during the 2003 Tour de France.
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Former cyclist Scott Mercier has gained notoriety for refusing to go on a doping program 15 years ago. Here, Mercier (in blue jersey) rides just ahead of cyclist Chris Horner in 1997.
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Lance Armstrong grimaces prior to the start of the third stage of the Tour de France cycling race in Wanze, Belgium, on July 6, 2010. Armstrong said Thursday he is finished fighting charges from the U.S. Anti-Doping Agency that he used performance-enhancing drugs during his unprecedented cycling career.
LaShawn Merritt crosses the finish line first, in the men's 4x400-meter relay at the IAAF World Athletics Championships in Daegu, South Korea, Sept. 2. Once banned for doping, Merritt has been cleared to run in London next summer.