The International Olympic Committee says Vitalijs Pavlovs tested positive for the stimulant methylhexaneamine after Latvia's loss to Canada in the quarterfinals.
He is the fourth athlete to fail a drug test at the games.
Earlier Saturday, the Ukrainian Olympic Committee said cross-country skier Marina Lisogor tested positive for the stimulant trimetazidine.
The latest positive tests follow those of German biathlete Evi Sachenbacher-Stehle and Italian bobsledder William Frullani.
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