 Until his 2013 admission, Armstrong continually denied using illegal performance-enhancing drugs and described himself as the most tested athlete in the world.However, a 1999 urine sample showed traces of corticosteroid; a medical certificate showed he used an approved cream for saddle sores which contained the substance.O'Reilly claimed that team officials conspired with a compliant doctor to falsify Armstrong's prescription, and that Armstrong never had the condition.