Kamila Valieva: US anti-doping chief questions skater's drug regimen to 'increase endurance and reduce fatigue'

Kamila Valieva -- the teenage Russian figure skater at the center of a doping controversy roiling the Beijing Olympics -- had three substances that can be used to aid the heart in her testing sample, according to a report in the New York Times, which cited an exhibit filed in a Sunday hearing by the Court of Arbitration for Sport (CAS).