USADA, the agency that oversees antidoping efforts in Olympic sports in the U.S., said "numerous riders, team personnel and others will testify based on personal knowledge" of Mr. Armstrong's alleged doping. The knowledge was "acquired either through observing Mr. Armstrong dope" or through "admissions of doping to them," it added.
The letter also mentions "data from blood collections obtained by" the International Cycling Union, or UCI, in 2009 and 2010. "This data is fully consistent with blood manipulation" including use of use erythropoietin, or EPO, a drug that controls red-blood-cell production, "and/or blood transfusions."
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