Because she is 15, Valieva is considered a “protected person” under anti-doping rules and could escape major sanctions. Her coaches and other members of her entourage are subject to automatic investigation and bigger penalties.

Two legal substances used to improve heart function were listed on an anti-doping control form filled out for Russian figure skater Kamila Valieva before her drug case at the Olympics erupted, according to documents submitted on her behalf, AP reports.

The World Anti-Doping Agency filed a brief in the Valieva case stating that the mention on the form of L-carnitine and Hypoxen, though both legal, undercuts the argument that a banned substance, trimetazidine, might have entered the skater’s system accidentally.

Hypoxen, a drug designed to increase oxygen flow to the heart, was a substance the U.S. Anti-Doping Agency recently tried, without success, to get placed on the banned list. L-carnitine, another oxygen-boosting performance enhancer, is banned if injected above certain thresholds. The supplement was the focal point of the doping case involving track coach Alberto Salazar.

Combining those with 2.1 nanograms of the heart medicine trimetazidine, the drug found in Valieva’s system after a Dec. 25 test, is “an indication that something more serious is going on,” USADA CEO Travis Tygart said.

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