Nadezhda Sergeeva was disqualified from the Games after testing positive for the banned substance trimetazidine.

She was the second Russian to fail a test at the Games -- where she finished 12th -- and her case played a role in Russian athletes not being allowed to march under their own flag at the closing ceremony.

Vladimir Uiba, the head of Russia's Federal Medical-Biological Agency, tells Russian media his agency tried to bar Sergeeva from competing because of a heart condition, but Sports Ministry officials let her travel.

He says "organizational fecklessness" led to Sergeeva's mother, a doctor, giving her unapproved medicine containing trimetazidine.