The U.S. Anti-Doping Agency (USADA) says Lance Armstrong was involved in what it calls “the most sophisticated, professionalized and successful doping program that sport has ever seen.”
The USADA released more than dozens of pages of evidence against the cycling team sponsored by the U.S. Postal Service. The agency said it has "direct documentary evidence including financial payments, e-mails, scientific data and laboratory test results that further prove the use, possession and distribution of performance-enhancing drugs by Lance Armstrong."
The anti-doping group also said 11 riders had come forward admitting their use of performance-enhancing drugs while on the team, including Armstrong’s teammate George Hincapie.
"Early in my professional career, it became clear to me that, given the widespread use of performance-enhancing drugs by cyclists at the top of the profession, it was not possible to compete at the highest level without them," Hincapie said in a written statement. "I deeply regret that choice and sincerely apologize to my family, teammates and fans."
Armstrong has repeatedly denied the allegations. His attorney, Tim Herman, calls the report a “government witch hunt.”
Check out our gallery of other sports stars involved in doping scandals.