The 15-year-old figure skater embroiled in a Winter Games doping scandal has defended her positive drug test by saying it was caused by a mix-up with her grandfather¡¯s heart medication, an Olympic official said on Tuesday.

Kamila Valieva made the argument at a hearing with the Court of Arbitration for Sport (CAS) into whether she should be allowed to continue competing in Beijing, Denis Oswald, Permanent Chair of the International Olympic Committee¡¯s Disciplinary Commission said.

¡°Her argument was this contamination happened with a product her grandfather was taking,¡± Oswald said.