TWIF  2021 Anti -Doping Rules  v1 Page 13 of 67    substance or method 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.