The Tour de France is one of the most grueling sporting events in the world. A three week ride through 2,000 miles of French countryside.
And it's no stranger to controversy.
Lance Armstrong won the event 7 times between 1999 and 2005. His feat has always had its detractors... with suspicions that doping might have given him the edge.
Armstrong has been tested and retested. Earlier this year, federal prosecutors dropped their investigation. Then last month, the US anti-doping agency charged Armstrong with doping during his Tour de France victories.
Armstrong is preparing to fight the allegations.
Ultimately, his case will likely be decided by the Court of Arbitration for Sport.
What is the C-A-S?
Alan Abrahamson, a columnist for 3 Wire Sports and a lecturer at the Annenberg School for Journalism, explains.