Is Lance Armstrong still lying?

Lance Armstrong confessed to doping, but USADA CEO Travis Tygart says Armstrong also lied in his interview with Oprah Winfrey

The following script is from "The Fall of Lance Armstrong" which aired on Jan. 27, 2013. Scott Pelley is the correspondent. Michael Radutzky, Michael Rey and Oriana Zill de Granados, producers.

We have learned that U.S. anti-doping authorities have given Lance Armstrong a deadline of February 6th to agree to confess all under oath. If he declines, we are told that his lifetime ban in sports will be irreversible. Armstrong admitted to doping, for the first time, in an interview with Oprah Winfrey last week. But the director of the U.S. Anti-Doping Agency, Travis Tygart, told us that Armstrong did not tell the truth in that interview and left out the most important facts that investigators want to nail down.

Tygart is the official who pursued the Armstrong investigation when others had given up. The evidence amassed by his anti-doping agency forced Armstrong to surrender his titles, lose his sponsors and quit his charity. Armstrong says he wants to return to sport. Travis Tygart holds the keys to that decision. So we asked him this week about Armstrong's talk show confession.

Scott Pelley: You know, at one point in the interview he said that he was curious about the definition of the word cheater. And he looked it up in the dictionary and didn't think it necessarily applied to him.

Travis Tygart: It's amazing. I mean Scott you could go to almost any kindergarten in this country or frankly around the world and find kids playing tag or four square and ask 'em what cheating is. And every one of 'em will tell you it's breaking the rules of the game. No real athlete has to look up the definition of cheating.

Scott Pelley: Armstrong described doping as so routine, it was, quote, "Like the air in our tires and the water in our bottles." What did you think of that?

Travis Tygart: It's just simply not true. And I think it's a pretty cowardly self-interested justification or rationalization for his decision to defraud millions of people.

The U.S. Anti-Doping Agency, known as USADA, polices U.S. Olympic sport. Last October, it issued a report that's called a "reasoned decision." It was a thousand pages of evidence that found that Armstrong had run quote "the most sophisticated, professionalized and successful doping program that sport had ever seen." That was one of USADA'S conclusions that Armstrong denied in his interview last week.

Scott Pelley: He suggested that cycling in those years was a level playing field because everyone did it. He wasn't doing anything special.

Travis Tygart: It's just simply not true. The access they had to inside information to how the tests work, what tests went in place at what time, special access to the laboratory, he was on an entirely different playing field than all the other athletes even if you assume all the other athletes had access to some doping products.

Scott Pelley: Armstrong admitted in the interview to doping throughout his seven Tour de France victories. He tried to make a comeback in 2009. He admitted the first seven, but those last two races in '09 and 2010 he said he did not dope, he was racing clean.

Travis Tygart: Just contrary to the evidence. The evidence is clear. His blood tests in 2009, 2010, expert reports based on the variation of his blood values from those tests, one to a million chance that it was due to something other than doping.

Scott Pelley: You have to wonder why if he admits to doping in the first seven Tour de France races, why he would proclaim his innocence in 2009 and 2010.

Travis Tygart: I think it stops the criminal conspiracy and protects him and the others that helped him pull off this scheme from potential criminal prosecution if that was in fact true.

Scott Pelley: How does that help him in that way?

Travis Tygart: There's a five-year statute on a fraud criminal charge. So the five years today would have been expired. However, if the last point of his doping as we alleged and proved in our reasoned decision was in 2010, then the statute has not yet expired and he potentially could be charged with a criminal violation for conspiracy to defraud.

The famous US Postal Team was fueled by dope. There was an illegal blood booster called EPO, there was testosterone, and a banned technique called blood doping in which riders store fresh blood and transfuse it into their bodies during a race. Records were broken, victories spoke for themselves and, for a decade, no one spoke of anything else.

Travis Tygart: The first break that finally cracked the code of silence or the "omerta" that existed in the sport was when several witnesses in the spring of 2010 came forward and they told us their stories.