Armstrong still telling lies, says Tygart

United States Anti-Doping Agency head Travis Tygart has claimed Lance Armstrong is still lying about the full extent of his doping past.

Tygart, the USADA chief executive who was one of the key figures in exposing the disgraced cyclist, insisted there was scientific proof that Armstrong did use performance-enhancing drugs on his comeback to the sport, in 2009 and 2010.

The cyclist finally admitted in his interview with Oprah Winfrey that he did dope in all seven of his Tour de France wins, but maintained he raced clean when he came out of retirement.