Sources: Landis talks to FDA

Floyd Landis is cooperating with the Food and Drug Administration's criminal investigations unit, which is looking into Landis's allegations that he and other cyclists used performance-enhancing drugs, ESPN.com's Bonnie D. Ford confirmed through sources.

Sources told ESPN.com Landis had a meeting with FDA special agent Jeff Novitzky, a former Internal Revenue Service special agent, who led the Bay Area Laboratory Cooperative case.

Landis, who was stripped of the 2006 Tour de France title after failing a drug test, admitted Wednesday to ESPN.com he had used performance-enhancing drugs for most of his career as a professional road cyclist.

He also claimed that Lance Armstrong and longtime coach Johan Bruyneel paid an International Cycling Union official to cover up a test in 2002 after Armstrong purportedly tested positive for the blood-boosting drug EPO.

ESPN and other media outlets obtained e-mails sent by Landis to cycling and anti-doping officials over the past few weeks, implicating dozens of other athletes, including seven-time Tour de France winner Armstrong, team management and owners, and officials of the sport's national and international governing bodies.

Armstrong denied the allegations on Thursday: "I have nothing to hide ... I think history speaks for itself here."