French fencer Ysaora Thibus, a favorite for gold in the foil event at the Olympics, faces the possibility of being stripped of any medal she wins. This comes after the World Anti-Doping Agency (WADA) appealed a decision clearing her of a doping violation. While Thibus is allowed to compete for now, the Court of Arbitration for Sport (CAS) could impose a four-year ban, leaving her future uncertain.