The 17-year-old will be heard via video link from Moscow and the hearing is scheduled to take place over three days. Judgment is expected by the end of the year.

The nine-member U.S. team is eagerly following developments. They finished second in the team event behind Russia with Valieva and a medal ceremony has not yet taken place.

Valieva's defense is based on the fact that she ingested a prohibited substance by accidentally ingesting her grandfather's heart medication, via contaminated drink or food, which may have been on a plate or in a glass of drink, for example.

Allowed to compete in the Olympics despite a positive test

The positive test was announced during the Games and a panel from Cas allowed Valieva to compete further after lengthy interrogations.

The anti-doping agency Wada and the International Skating Federation have taken the case further after the Russian figure skating federation acquitted Valieva, who was 15 at the time, in January.

Wada is demanding a four-year suspension and that she be dismissed from the Olympics.

"We want to see a verdict based on facts," Wada spokesman James Fitzgerald said.