Lance Armstrong during the 2009 Tour de France. Agence France-
Presse/Getty Images  Oscar-winning filmmaker Alex Gibney was in
the midst of editing a two-hour-long documentary about Lance
Armstrong's 2009 comeback to pro cycling—with the title "The
Road Back"—when he heard the news that Floyd Landis, one of
Armstrong's former teammates, sent lengthy emails to cycling
officials providing details of the doping program on Armstrong's
former U.S. Postal Service team.  Armstrong responded with
powerful denials, calling Landis a liar. But then a two-year
federal criminal investigation into doping on Armstrong's teams
ensued, followed by a 2012 battle between Armstrong and the U.S.
Anti-Doping Agency, with the agency releasing thousands of pages
of its evidence against him.  In late 2012, Armstrong was
stripped of all seven of his Tour de France titles, and in early
2013, he publicly acknowledged, on Oprah Winfrey's show, that he
used banned performance-enhancing drugs and methods to win the
event from 1999 to 2005.