US Anti-Doping Agency chief Travis Tygart says Lance Armstrong lied in his confessional interview with Oprah Winfrey, and the shamed cyclist has until February 6th to cooperate fully if he wants to lessen his life ban.
Tygart says Armstrong lied about several key points - including his claim that he raced clean in his comeback in 2009 and 2010.
Tygart says he has written to the shamed cyclist and offered him a deadline of February 6th to "cooperate fully and truthfully" in exchange for a possible lessening of his lifetime ban from sports.
