As an exception, however, when a Prohibited Substance or Prohibited Method has been removed from the Prohibited List, an Athlete or other Person currently serving a period of Ineligibility on account of the formerly Prohibited Substance or Prohibited Method may apply to the Anti-Doping Organization which had Results Management responsibility for the anti-doping rule violation to consider a reduction in the period of Ineligibility in light of the removal of the substance or method from the Prohibited List.120 [Comment to Article 27.4: Other than the situation described in Article 27.4, where a final decision finding an anti-doping rule violation has been rendered prior to the existence of the Code or under the Code in force before the 2021 Code and the period of Ineligibility imposed has been completely served, the 2021 Code may not be used to re-characterize the prior violation.