4.3 WADA’s Determination of the Prohibited  List  WADA’s determination of the Prohibited Substances and Prohibi ted Methods that will be included on the Prohibited List , the classification of substances into categories on the Prohibited List , the classification  of a substance  as prohibited  at all times  or In-Competition  only,  the classification  of a substance or met hod as a Specified Substance , Specified Method or Substance of Abuse is final and shall not be subject to any challenge by an Athlete or other Person including, but not limited to,  any challenge  based  on an argument  that the substance  or method  was not a masking  agent  or did not have the potential to enhance performance, represent a health risk or violate the spirit of sport.