A curling bronze medalist from the Olympic Athlete from Russia team was confirmed to have tested positive for the banned substance meldonium, a source familiar with the matter said on Tuesday.
The Court of Arbitration for Sport announced a day earlier that it has opened a doping case on mixed doubles curler Aleksandr Krushelnitckii.
The preliminary B sample examined on Monday returned a positive result, the same finding as from the A sample which initially detected traces of meldonium, a drug that increases blood flow to allow for improved aerobic capacity, the source said.
The breach could have wider ramifications for Russian athletes and the country's National Olympic Committee in the wake of the widespread, state-sponsored doping in Sochi four years ago that led to it being banned from the Olympics in South Korea.
The OAR called the finding extremely regrettable but also said that all samples from the athlete collected before Jan. 22 had been negative, suggesting it wishes to investigate further. Krushelnitckii denies knowingly ingesting meldonium.
OAR athletes who had proven themselves clean were permitted to take part in the Pyeongchang Games, but both the Russian flag and national anthem were prohibited. The positive test comes at a difficult time for Russian sport as it attempts to make a fresh start after the Sochi scandal.
More on the Olympics:
Olympics: Japan loses to Switzerland, ends women's hockey tourney 6th
Olympics: S. Korea claims gold in women's 3,000 short track relay
Olympics: Japanese teens Kunitake, Okubo miss out on big air final
