Russian-bobsledding pilot Nadezhda Sergeeva, 30, tested positive for Trimetazidine despite donning an "I Don't Do Doping" T-Shirt and starring in a promotional video against using performance-enhancing drugs, according to the New York Post.
Sergeyeva, who finished 12th in the two-woman bobsleigh, "is excluded from the Olympic Winter Games Pyeongchang 2018", CAS said in a statement.
This isn't the first time that Sergeeva has fallen foul of anti-doping laws as she also tested positive for the banned substance meldonium in 2016.
She had reportedly submitted a negative test five days earlier.
Sergeeva, who wore a T-shirt at the start of the games that said "I don't do doping", was the second Russian to test positive at the Olympics.
In January 2017, Sergeeva and Kocherzhova won silver at the European championship.
Russia was banned from the Pyeongchang Olympics over widespread doping at the Sochi Games four years ago, but 168 Russians including Krushelnitsky were allowed by the IOC to compete as "Olympic Athletes from Russia" under the Olympic flag. But I very much hope that most of what is in our report will have a positive outcome for us. "Unfortunately this case speaks to negligence by the athlete".
"It's a lot of emotion for us and just being there, enjoy what we did, I feel it's that we need to remember from the Games", she said. "She has let us down". "There's a lot of people coming up and saying, 'We're happy you're here'".
Athletes from other countries were of the opinion that Russian Federation had forfeited the right to parade with their flag Sunday.
Now a second athlete from the Olympic Athletes of Russia team (competing instead of the banned Team Russia - complicated, this) at the 2018 Winter Olympics has tested positive for a banned substance. "The medical staff of the national team did not prescribe the drug to the sportswoman".
The rower who won a silver medal in 1984 became an International Olympic Committee member in 2016.
Russian bobsledder Nadezhda Sergeeva has admitted to doping and has been disqualified from the Pyeonchang Games, a development that could further jeopardize the embattled nation's chances for reinstatement. Another gold medalist, Dmitry Trunenkov, was banned previous year for failing a doping test.