In January 2024, French Olympic foil fencer Ysaora Thibus tested positive for ostarine, a selective androgen receptor modulator associated with performance enhancement, after competing at the Challenge International de Paris. The result triggered a provisional suspension in February, placing the 2022 individual world champion and Tokyo 2020 team silver medalist under intense scrutiny shortly before the Paris Olympics. Thibus denied knowingly taking the substance and offered an extraordinarily unusual explanation: she argued that the ostarine had entered her system through kissing her then-partner, American foil fencer Race Imboden, whom she said she did not know had been using it.
In May 2024, the International Fencing Federation accepted her account and ruled that she bore no fault or negligence for the anti-doping rule violation. The only sporting consequence was the disqualification of her results from the Paris event; she received no further suspension or sanction and was able to compete at the 2024 Paris Olympics, where she lost in the opening round of the individual foil and helped France finish fifth in the team event. The World Anti-Doping Agency challenged the lenient finding, but the appeal was dismissed by the Court of Arbitration for Sport in July 2025. The case remains one of the most bizarre modern anti-doping episodes because a top-level athlete was cleared of intentional wrongdoing on the basis of claimed intimate contact with an allegedly undisclosed source of the banned substance.
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