Track star Sha’Carri Richardson wonders why she was treated differently after Russian figure skater Kamila Valieva gets to compete after a failed drug test

Track star Sha’Carri Richardson missed the last Olympics after testing positive for marijuana, now she’s calling on what she thinks is racial bias in drug testing in sports. It was recently reveled that Russian figure skater Kamila Valieva failed a drug test ahead of the Winter Olympics in Beijing, however, has been cleared to compete according to CBS News.

“Can we get a solid answer on the difference of her situation and mines?” Richardson tweeted this week. “My mother died and I can’t run and was also favored to place top 3. The only difference I see is I’m a black young lady.”

The 21-year-old was disqualified from the women’s 100 meters after her Olympic qualifying run last July, she said during an interview with NBC News that she used marijuana in Oregon – where the substance is legal to cope with the death of her mother. Richardson said she wasn’t making excuses and took responsibility for her decision. The runner was suspended for one month, and coaches chose not to add her to the Olympic roster in an effort to “maintain fairness” for the other athletes who adhered to the banned substances rules, USA Track and Field said.

In Valieva’s case, the skater tested positive for a banned heart medication, trimetazidine, in Russia in December. The drug is used to treat heart-related conditions, however, not approved in the U.S. – increases blood flow to the heart, according to Reuters.

“If you’re in a highly exertional sport, where you’re using a lot of energy and you’re putting your heart under significant stress, it certainly could help your heart function better theoretically,” Dr. Kelly Johnson-Arbor, a medical toxicology physician at MedStar Georgetown University Hospital, told Reuters.

According to CBS NEWS:

A hastily arranged hearing on the 15-year-old’s failed drug test ended in less than 12 hours, with the Court of Arbitration for Sport ruling on Monday she does not need to be suspended ahead of an investigation into the test. The court said its decision favored her because she was a minor or “protected person,” and was subject to different rules from an adult athlete.

Valieva, the favorite for the women’s individual gold, can keep skating before her case is resolved but the ruling doesn’t decide the fate of the one gold medal that she has already won in Beijing. If she does place in the top three, there won’t be a medal ceremony,  the International Olympic Committee said.

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