Lance Armstrong refuses to cooperate with USADA
In his television confessional to Oprah Winfrey last month, Armstrong contradicted several parts of USADA's investigation, saying he had stopped doping after 2005 and was not a ringleader in the doping programme.
Tygart, in a later television interview, said Armstrong had lied to Winfrey because USADA evidence showed he was doping when he rode in the Tour de France two final times in 2009 and 2010.
According to Tygart, expert reports based on the variation of Armstrong's blood values make it a "one to a million chance that it was due to something other than doping."
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