Lance Armstrong Faces New Doping Charges Lance Armstrong faces new doping charges that could lead to his being stripped of his seven Tour de France titles, according to a letter from the United States Anti-Doping Agency that was sent to Armstrong and several of his former cycling colleagues. The letter, which was sent Tuesday and signed by the antidoping agency's testing results manager, informed Armstrong that the agency had initiated a formal doping procedure against him. The inquiry means Armstrong, who retired from professional cycling in 2011, will be ineligible to compete in triathlons, a sport that has been his recent focus. Armstrong, 40, was scheduled to compete in a full-length triathlon in France this month, and had hoped to qualify for the Ironman World Championship in Hawaii in the fall. But triathlon rules bar from competition any athlete who is being formally investigated for doping. The letter, which was first reported by The Washington Post on Wednesday, describes some of the evidence against Armstrong. The allegations start with doping rules he allegedly violated during his stints with the United States Postal Service cycling team, the Discovery Channel team, the Astana team and the RadioShack team. The time frame begins in 1996 and stretches through 2010, the final year Armstrong rode in the Tour. "The witnesses to the conduct described in this letter include more than 10 cyclists as well as cycling team employees," the letter said. Armstrong is accused of using the blood booster E.P.O., blood transfusions, testosterone, human growth hormone, corticosteroids, and saline and plasma infusions to boost his performance or mask his use of banned substances. The notice was sent to Armstrong through his Washington lawyer, Robert D. Luskin, and also sent to Johan Bruyneel, Armstrong's longtime team manager and the current manager of the RadioShack Nissan Trek cycling team; Pedro Celaya, the team doctor for the RadioShack team; Luis Garcia del Moral, the former team doctor for the Postal Service team; Michele Ferrari, Armstrong's longtime personal coach; and Pepi Marti, a former team trainer on the Postal Service squad.