he denied doping but admitted this spring that he used performance-enhancing drugs.
Tour de France winner Contador suspended for failed drug test →
Armstrong became a more important figure in the probe this spring after Landis, who was stripped of the 2006 Tour de France title for failing a doping test, dropped long-standing denials and acknowledged he used performance-enhancing drugs.
U.S. investigators reportedly interview anti-doping officials →
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