Fencing · France · FIE (Doping Disciplinary Tribunal), with testing by the International Testing Agency

Ysaora Thibus: doping case, ban and appeal

Cleared CAS dismissed WADA's appeal on 7 July 2025 and upheld the finding of no fault or negligence.

Violation

Presence of a prohibited substance: ostarine (S1.2), in an in competition sample collected by the International Testing Agency on 14 January 2024 at the Challenge International de Paris¹

Results disqualified

Not stated in the CAS release

Appeals

• FIE Doping Disciplinary Tribunal, 4 June 2024: No Fault or NegligenceThe tribunal found no fault or negligence and imposed no period of ineligibility.¹
• CAS (appeal by WADA), 7 July 2025: DismissedWADA sought four years. The panel accepted that contamination through kissing a partner who had been taking ostarine could explain the result, excluded intentional ingestion and said it is "not questionable that Ms Thibus bears no fault or negligence".¹

Sources

1. Court of Arbitration for Sport, CAS dismisses WADA appeal in the case of Ysaora Thibus (France), CAS media release 10748 (7 July 2025)