This is the fourth doping case to hit the Pyeongchang Olympics and second from Russia

Winter Olympics: Russia's Nadezhda Sergeyeva in doping trap, thrown out

Russian bobsledder Nadezhda Sergeyeva has tested positive for a banned substance at the Winter Olympics, Russia's bobsleigh federation said

Russian bobsledder tests positive for banned substance at Winter Olympics

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Winter Olympics: Russia's Nadezhda Sergeyeva in doping trap, thrown out

Russian bobsledder tests positive for banned substance at Winter Olympics