8.4 Single Hearing Before CAS   Anti-doping rule violations asserted against  Internationa l-Level Athletes , National -Level  Athletes  or other Persons  may, with the consent of the Athlete  or other Person , WBF  (where it has Results Management  responsibility in accordance with Article 7)  and WADA , be heard in a single hearing directly at CAS.37                                                  37  [Comment to Article 8.4: In some cases, the combined cost of holding a hearing in the first instance at the international or national level, then rehearing the case d e novo before CAS can be very substantial.