French authorities have closed a doping case against Russian athlete Olga Yegorova after a laboratory failed to explain why one of her urine samples was unusable.
A doping adviser at France's Sports Ministry says it is unclear why two vials of Yegorova's urine taken during a July meet in France did not match up.
The A sample showed traces of the performance-enhancing EPO, and no reading could be taken from the B sample.
Athletics: Yegorova doping case closed
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