Day 8 of the 2022 Beijing Winter Olympics

American skiing star Mikaela Shiffrin said she hasn’t decided if she will race in the women’s downhill event Tuesday.

Shiffrin, who did not finish in her favorite disciplines, the giant slalom and slalom, crossed the finish line at Beijing 2022 for the first time in the super-G event, finishing ninth overall.

Her Olympic medals have come in giant slalom (2018), slalom (2014) and alpine combined (2018).

Shiffrin last raced in downhill in December at Lake Louise.

There are two more women’s downhill training sessions scheduled: one on Sunday and one on Monday.

Controversy surrounding a drugs test reportedly taken in December, that has only come to light during the Winter Olympics in Beijing, continues to delay the medal ceremony of the figure skating team event, which was won by the Russian Olympic Committee (ROC).

But what is trimetazidine, the banned substance at the heart of the controversy?

According to the European Union's medicines agency (EMA), trimetazidine "is a medicine used to prevent angina attacks, which are sudden pains to the chest, jaw and back brought on by physical effort, due to reduced blood flow to the heart."

It is listed in the World Anti-Doping Agency's (WADA) 2021 prohibited substances under the category of "hormone and metabolic modulators," a class of drugs that have been banned by WADA due to evidence of athletes using them for performance enhancement.

"This is an interesting choice to be used in this way because I think a lot of times, people might think: to enhance your performance, you'd use a stimulant or something that would increase your heart rate or get your metabolism going," Dr. Elizabeth Murray, pediatric emergency medicine physician at the University of Rochester Medical Center, told CNN on Thursday.

"But what this drug does is actually make your heart work more efficiently. It doesn't change your blood pressure very much or change your heart rate," Murray said.

"An athlete wouldn't get jittery or necessarily feel all that different, but they would theoretically be able to perform at a higher level for longer. It would increase their endurance, potentially."

It's been used by athletes before: The most famous case of doping involving trimetazidine is Chinese swimmer Sun Yang, who was handed a three-month suspension in 2014 after testing positive for the drug.

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International Olympic Committee (IOC) spokesman Mark Adams said Russian figure skater Kamila Valieva's doping case will be resolved by February 15.

In a news conference in Beijing Saturday, Adams told reporters he is "as certain as (he) can be" that "there will be a resolution" to Valieva's case after the athlete tested positive for a banned substance – the heart medication Trimetazidine.

He added the IOC decided to "outsource both the testing and sanctioning" in the case "for obvious reasons."

The doping scandal: The doping scandal surrounding 15-year-old Valieva has rocked the Beijing 2022 Winter Olympics.

The breakout star of the Games helped the ROC take home gold in the figure skating team event. She was allowed to compete despite testing positive for the banned drug trimetazidine, which is commonly used to treat people with angina.

The failed test only came to light during the Winter Olympics, and it remains unclear if the drug test controversy will see the medal revoked.

The Russian Anti-Doping Agency announced Friday it has launched an investigation into Valieva’s support staff following her positive test.

The United States could prosecute Russian individuals allegedly involved her doping case, the head of the US Anti-Doping Agency, Travis Tygart, told CNN Friday.

Eight new Covid-19 cases were reported among Beijing 2022 Olympic Games-related personnel, organizers said Saturday.

Four of the new cases were athletes and team officials and the remaining four were stakeholders, Beijing Winter Olympics Organizing Committee spokesman Zhao Weidong said in a briefing Saturday.

Covid at the Olympics: Organizers have reported at least 426 Games-related Covid-19 cases since January 23. Of those, 258 cases were detected at the airport and 168 cases detected inside the Games' "closed loop" system, which separates Olympic athletes, support staff, media and volunteers from the rest of the Beijing public.

American snowboarder Nick Baumgartner has become the oldest snowboard Olympic medallist -- of any color medal.

The 40-year-old champion won the mixed team's snowboard cross event on Saturday in Beijing, alongside 36-year-old partner Lindsey Jacobellis.

It's his fourth Olympics, but this marks his first Olympic medal.

Baumgartner's redemption comes after finishing 10th in the individual event.

American snowboarder Lindsey Jacobellis, who won her first Olympic gold medal earlier at the Beijing 2022 Games, has now has won a second gold medal.

Jacobellis, 36, and her 40-year-old partner, Nick Baumgartner, won the mixed team snowboard cross event on Saturday. This is the Olympic debut for this event.

In this team event, the men run first, followed by the women.

In the final, Baumgartner gave the US a 0.04-second lead for Jacobellis, who then edged Italy’s Michela Moioli at the finish line for the win.

In a move that recalled the 2006 Winter Games, Jacobellis grabbed her board on a jump at the end of the race.

In Italy 16 years ago, Jacobellis infamously grabbed her board during a jump while she was in the lead and then fell, instead winning silver. An Olympic gold had eluded Jacobellis – until Beijing 2022.

Italy's Omar Visintin and Moioli won silver, while Canada’s Eliot Grondin and Meryeta O’Dine won bronze.

A second Italian team, made up of Lorenzo Sommariva and Caterina Carpano, finished fourth.

United States Ski & Snowboard says it has opened an investigation into allegations of sexual misconduct and inappropriate behavior involving longtime head coach Peter Foley. 

The allegations were brought to the surface by Instagram posts made by former athlete former athlete Callan Chythlook-Sifsof, a member of the 2010 US Olympic snowboard team. 

In a series of Instagram posts, 32-year-old Chythlook-Sifsof accused Foley of taking "naked photos of female athletes for over a decade." 

Chythlook-Sifsof’s post also accused fellow athlete Hagen Kearney of intimidating behavior and using racial slurs. Kearney is currently competing in snowboard cross in Beijing.

Chythlook-Sifsof reposted the allegations to her page and her story after Instagram removed them for violating "our guidelines on nudity or sexual activity" and "bullying."

What Foley says: Foley has served as a head coach of the US snowboard team since it was founded in 1994. He has denied the accusations and told Newsweek he was "surprised by them." 

He said: "I'm surprised by the allegations. I vehemently deny the allegations. I'm doing my best to concentrate on supporting the athletes at the Olympics."  

The allegations: In one post, Chythlook-Sifsof began by saying: "I cannot watch another Olympic Games without saying this publicly."

She went on to say that during a race in in Lake Louise, Alberta, Canada, in 2014, Foley made an explicit comment to her and a female teammate about sexual acts with another woman.

In the same post, she said Kearney used the n-word routinely to "intentionally to get under my skin." 

In an email to USA Today, Kearney said, "I made a mistake years ago with my words and appropriate action was taken. I learned from my mistake and I’m a better person now for it.” 

US Ski & Snowboard spokesperson Tom Horrocks did not respond to questions asking whether Foley, who is currently in Beijing, will continue to coach throughout the Olympics, and would not comment further at this time.  

The US Center for SafeSport told CNN that they do not comment on "matters to protect the integrity of the investigative process." 

CNN has reached out to Chythlook-Sifsof, Foley, and Kearney for additional comment, but did not immediately hear back.

CNN's Kevin Dotson contributed to this report 

The doping scandal surrounding Kamila Valieva, the 15-year-old Russian Olympic Committee (ROC) figure skater, has rocked the Beijing 2022 Winter Olympics.

She was allowed to compete despite testing positive for the banned heart drug trimetazidine, which is commonly used to treat people with angina. The failed test only came to light during the Winter Olympics, and it remains unclear if the drug test controversy will see the gold medal revoked.

Here's a timeline of the events we know so far:

Dec. 25, 2021: Drug sample is taken from Valieva at the 2022 Russian Figure Skating Championships in Saint Petersburg, Russia.

Jan. 15, 2021: Valieva wins 2022 European Championships in Tallinn, Estonia.

Feb. 1, 2022: Valieva arrives in Beijing for the Winter Olympics.

Feb. 7, 2022: Valieva helps the ROC win gold in the figure skating team event at Beijing 2022, landing the first ever quadruple jump by a woman in Olympic competition.

Feb. 7, 2022: A lab accredited by the World Anti-Doping Agency (WADA) in Stockholm, Sweden, confirms an adverse analytical finding in Valieva's sample, WADA said.

Feb. 8, 2022: Valieva is notified and provisionally suspended by RUSADA.

Feb. 8, 2022: The medal ceremony for the figure skating team event is postponed. Later, reports emerge of a failed drugs test by a member of the ROC team.

Feb. 9, 2022: Valieva challenges provisional suspension; RUSADA's Disciplinary Anti-Doping Committee lifts the suspension.

Feb. 10, 2022 : Valieva trains as normal at the Capital Indoor Stadium in Beijing.

Feb. 11, 2022: The International Testing Agency (ITA) confirms Valieva failed a test for a banned substance in December, adding it will appeal RUSADA's decision to lift the suspension at the Court of Arbitration for Sport (CAS) on behalf of the IOC. WADA and the International Skating Union (ISU) also said they will appeal.

Valieva is scheduled to compete at two other events at the Beijing Games — one on February 15 and one on February 17.

The United States could prosecute Russian individuals allegedly involved in figure skater Kamila Valieva's doping case under the American Rodchenkov Anti-Doping Act (RADA), the head of the US Anti-Doping Agency (USADA), Travis Tygart, told CNN on Friday.

The RADA bill, named after whistleblower Grigory Rodchenkov who helped expose the Russian doping scandal, was signed into law by former US President Donald Trump in December 2020 and enables the US to impose criminal sanctions on individuals involved in doping at major international sports competitions that feature US athletes, sponsors and broadcasters.

Penalties for violating the law include up to 10 years imprisonment and fines of $250,000 for individuals and $1 million for organizations.

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