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Lance Armstrong files federal lawsuit against U.S. Anti-Doping Agency

Lance Armstrong says he's taken more than 500 drug tests without ever being flagged for a positive test. (Bryn Lennon/Getty Images)

Seven-time Tour de France champion and cancer survivor Lance Armstrong has vehemently denied using performance-enhancing drugs his entire career.

The U.S. Anti-Doping Agency disagrees.

On Monday, Armstrong filed a federal lawsuit against the USADA, saying the agency's rules violate athletes' right to a fair trial, as well as claiming the agency does not have jurisdiction in such a case.

After a two-year federal criminal investigation into Armstrong turned up no charges in February, the USADA says it has more evidence to use against the cyclist.

The anti-doping agency says up to 10 former teammates and associates are willing to testify against him and that it has blood samples from 2009-2010 that are "fully consistent" with doping.

Armstrong says he has been tested more than 500 times without once yielding a positive test. He retired from the sport in 2011.

According to ESPN's T.J. Quinn, no athlete has ever filed this type of lawsuit against the USADA successfully.

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