Each NationalAnti-Doping Organization shall ensure, for all Athlete sDoping Control1PARTArticle 4: The Prohibited List[Comment to Article 4.3.3: Thequestion of whether a substancemeets the criteria in Article 4.3(Criteria for Including Substances andMethods on the Prohibited List) in aparticular case cannot be raised asa defense to an anti-doping ruleviolation.