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Preview: The Fall of Lance Armstrong

|Armstrong confessed to doping in an interview with Oprah Winfrey last week, but U.S. Anti-Doping Agency CEO Travis Tygart, says the evidence proves Lance Armstrong withheld the truth and lied to Winfrey on key issues. Watch Scott Pelley's report on Sunday, Jan. 27 at 7:00 p.m. ET/PT.

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