USADA announced today that Barron Mosteller, of Orinda, Calif., an athlete in the sport of taekwondo, has accepted a one-year period of ineligibility for an anti-doping rule violation after testing positive for a prohibited substance.
Mosteller, 19, tested positive for furosemide as the result of a sample collected at the U.S. National Taekwondo Team Trials on January 19, 2025. Furosemide is a Specified Substance in the class of Diuretics and Masking Agents and is prohibited at all times under the USADA Protocol for Olympic and Paralympic Movement Testing, the United States Olympic and Paralympic Committee National Anti-Doping Policy, and the World Taekwondo Anti-Doping Rules, all of which have adopted the World Anti-Doping Code and the World Anti-Doping Agency Prohibited List.
USADA determined that Mosteller had been given a substance—which he later learned was furosemide—by a family member to aid him in cutting weight. Mosteller, who was 18 years old and still in high school at the time of the violation, had never been in a whereabouts pool and consequently had never received formal anti-doping education. Although Mosteller and his family were unaware of his anti-doping obligations, he was still subject to the rules given his USA Taekwondo membership. Mosteller was eligible for a reduced period of ineligibility based on the circumstances of his case.
Mosteller’s one-year period of ineligibility began on January 31, 2025, the date his provisional suspension was imposed. In addition, Mosteller has been disqualified from all competitive results obtained on and subsequent to January 19, 2025, the date his positive sample was collected, including forfeiture of any medals, points and prizes.
In an effort to aid athletes, as well as support team members such as parents, coaches, and medical professionals in understanding the rules applicable to them, USADA provides comprehensive instruction on its website on the testing process and prohibited substances, how to file and update athlete Whereabouts, how to obtain permission to use a necessary medication, and the risks and dangers of taking supplements, as well as performance-enhancing and recreational drugs.
In addition, USADA manages a drug reference hotline, Global Drug Reference Online (GlobalDRO.com), conducts educational sessions with National Governing Bodies and their athletes, and distributes a multitude of educational materials, such as a supplement guide, a nutrition guide, a clean sport handbook, and periodic alerts and advisories.
USADA makes available a number of ways to report the abuse of performance-enhancing drugs in sport in an effort to protect clean athletes and promote clean competition. Any tip can be reported using the USADA Play Clean Tip Center, by text at 87232 (“USADA”), by email at playclean@USADA.org, by phone at 1-877-Play Clean (1-877-752-9253) or by mail.
USADA is responsible for the testing and results management process for athletes in the U.S. Olympic and Paralympic Movement and is equally dedicated to preserving the integrity of sport through research initiatives and educational programs.
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