Disgraced cyclist Lance Armstrong may have lied to Oprah Winfrey during his interview, which aired on OWN on Thursday night, federal investigators told ABC News (video below).
During his Oprah interview, Armstrong admitted for the first time that he used performance-enhancing drugs and blood transfusions during his decade of cycling dominance and seven Tour de France wins.
Investigators said today that Armstrong possibly lied about when he stopped doping when he told Winfrey that the last time he used the drugs and transfusions was in 2005.
Armstrong said: "That's the only thing in this whole report that upset me. The accusation and alleged proof that they said I doped [in 2009] is not true. The last time I crossed the line, that line was 2005."
Winfrey asked: "You did not do a blood transfusion in 2009?"
Armstrong answered: "No, 2009 and 2010 absolutely not."
Investigators said today that Armstrong's blood at the 2009 race showed clear blood manipulation. His red blood cell count suddenly went up, but the number of baby red blood cells did not.
If Armstrong doped in 2005, but not 2009, the statute of limitations may have expired on potential criminal activity. If Armstrong did dope in 2009, then he could be charged, said investigators.
Armstrong is currently not facing criminal charges but is facing at least three civil suits.