Russian bobsledder Nadezhda Sergeyeva has tested positive for a banned substance at the 2018 Winter Olympics, Russia's bobsleigh federation said Friday.
"A doping test by the pilot of the Russian team Nadezhda Sergeyeva on 18 February gave a positive result for a heart medicine that is on the banned list," the federation said in a statement on its website, adding that a previous test on February 13 was negative.
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