(CBS News) Late Thursday night, Lance Armstrong -- arguably one of the greatest athletes of all time -- announced that he will not contest charges that he used performance-enhancing drugs. The charges had been brought by the U.S. anti-doping agency known as USADA. On Friday, the USADA banned Armstrong from the sport and began the process of stripping Armstrong of his cycling titles, including his record seven Tour de France victories.
"CBS Evening News" anchor Scott Pelley spoke with USADA head Travis Tygart on the agency's decision to ban Armstrong from cycling, especially why it was important to pursue this now.
"I think it's a sad day for all of us who love sport when one of our heroes is shown to have cheated with dangerous performance-enhancing drugs," said Tygart. "But on the other hand, these types of cases send a powerful message to all athletes out there that their decision to play by the rules ethically and principally is an important one and is one that's going to be supported."
Watch the full interview with Tygart above.