French Olympic fencer Ysaora Thibus has been cleared of an anti-doping rule violation by the Court of Arbitration for Sport (CAS) after judges accepted that her positive test for ostarine, a selective androgen receptor modulator, was due to contamination from repeatedly kissing her former U.S. partner. The 33-year-old world champion, who was provisionally suspended following the positive test, successfully argued that the substance entered her system through intimate contact rather than intentional doping. The CAS rejected the appeal filed by the World Anti-Doping Agency (WADA), confirming Thibus's innocence and allowing her to avoid a potential four-year ban.