New analysis of stored samples taken from athletes at the Beijing and London Summer Olympics has turned up 45 cases of banned substances. Here, urine samples are recorded upon arriving at the China Anti-Doping Agency in Beijing in 2008. Robert F. Bukaty/AP hide caption

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Robert F. Bukaty/AP

Russian athletes compete at track and field championships in Cheboksary on June 20. The International Olympic Committee has banned Russia's track and field team from the Summer Games for pervasive doping violations. The IOC on Tuesday put off a final decision on whether to bar the entire Russian team from the games that begin in Brazil on Aug. 5. Francesca Ebel/AP hide caption

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Francesca Ebel/AP

Canadian law professor Richard McLaren speaks at a news conference Monday in Toronto. McLaren is the author of a new report that accuses Russia of a widespread doping campaign. Frank Gunn/AP hide caption

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Frank Gunn/AP

Justin Gatlin celebrates victory in the 100 meters at the U.S. Olympic Trials for track and field. Gatlin has been suspended twice for failing doping tests, once in 2001 and again in 2006. Andy Lyons/Getty Images hide caption

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Andy Lyons/Getty Images

At The U.S. Olympic Trials, Mixed Opinions About Russian Doping Scandal

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Bribes paid by runner Liliya Shobukhova are at the center of an ethics inquiry, according to the IAAF, track and field's governing body. Ben Stansall/AFP/Getty Images hide caption

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Russia's Mariya Savinova won gold in the 800-meter final at the 2012 Olympics in London. A new report ruled that she should never should have competed because her drug test profile showed she was doping. Matt Dunham/AP hide caption

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Matt Dunham/AP

Doping Scandal Jeopardizes Olympic Dreams Of Russian Athletes

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Participants play the latest video games at the gamescom computer game fair in Cologne, Germany, on Wednesday. The Electronic Sports League, which sponsors a tournament in the city later this month, says it will require random drug tests to ensure players are clean. Martin Meissner/AP hide caption

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Martin Meissner/AP

Competitors race at the IAAF World Athletics Championship held in Osaka in 2007. Athletes' samples that were kept from the event have now been retested, resulting in suspensions, the IAAF says. Kai Pfaffenbach/Reuters /Landov hide caption

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Kai Pfaffenbach/Reuters /Landov

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. Odd Andersen/AFP/Getty Images hide caption

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Odd Andersen/AFP/Getty Images

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. Fabrice Coffrini/AFP/Getty Images hide caption

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Fabrice Coffrini/AFP/Getty Images

Alex Rodriguez of the New York Yankees, playing for the Yankees' minor league affiliate Charleston RiverDogs, runs to first base during a game in July 2013. Streeter Lecka/Getty Images hide caption

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Streeter Lecka/Getty Images

The incoming president of the International Cycling Union, Brian Cookson (right), shakes hands earlier this month with Pat McQuaid, the incumbent he defeated. Fabrice Coffrini/AFP/Getty Images hide caption

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Fabrice Coffrini/AFP/Getty Images

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. Jaime Reina/AFP/Getty Images hide caption

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Jaime Reina/AFP/Getty Images

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. Pascal Guyot /AFP/Getty Images hide caption

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Pascal Guyot /AFP/Getty Images

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. AP hide caption

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AP

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. Laurent Cipriani/AP hide caption

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Laurent Cipriani/AP

Dark clouds hang over Major League Baseball. There are reports that about 20 players may be suspended because of their connections to a Miami clinic that dispensed performance-enhancing drugs. (Photo taken Sunday at Yankee Stadium.) Jason Szenes /EPA /LANDOV hide caption

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Jason Szenes /EPA /LANDOV