Russian Kamila Valieva says her positive drug test

Attorneys for Russian figure skater Kamila Valieva argued that the banned substance trimetazidine entered her system through a medication that her grandfather takes

 if the IOC was aware of the explanation that Valieva, 15, offered to the Russian Anti-Doping Agency in an appeal hearing earlier this month

I was not in this hearing," Oswald said. "Her argument was this contamination which happened with a product her grandfather was taking

The crux of Valieva's defense had been previously reported Monday by The Dossier Center, a website run by exiled Russian businessman Mikhail Khodorkovsky

The website said it obtained audio of Valieva's hearing with RUSADA, which it said lasted 90 minutes

She also argued in the hearing that the product likely belonged to Valieva's grandfather