FILE - In this July 24, 2002, file photo, Lance Armstrong walks out of the Tour de France's anti-doping control bus after the 16th stage of the Tour de France cycling race, in La Plagne, France. Tyler... more 
FILE - In this July 24, 2002, file photo, Lance Armstrong walks out of the Tour de France's anti-doping control bus after the 16th stage of the Tour de France cycling race, in La Plagne, France. Tyler Hamilton, a former teammate of Armstrong, has told CBS News that he used performance-enhancing drugs with the seven-time Tour de France winner to cheat in cycling races, including the tour. Armstrong has steadfastly denied doping and has never failed a drug test. less 
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Associated Press | Photo By Peter Dejong, File
Thu, May 19, 2011 7:30 PM EDT