Otherwise, with respect to any anti-doping rule violation case which is pending as of the Effective Date and any anti-doping rule violation case brought after the Effective Date based on an anti-doping rule violation which occurred prior to the Effective Date, the case shall be governed by the substantive anti-doping rules in effect at the time the alleged anti-doping rule violation occurred, unless the panel hearing the case determines the principle of “lex mitior” appropriately applies under the circumstances of the case.25.3  Application to Decisions Rendered Prior to the  2015 Code  With respect to cases where a final decision finding an anti-doping rule violation has been rendered prior to the Effective Date, but the athlete or other Person is still serving the period of Ineligibility as of the Effective Date, the athlete or other Person may apply to the anti-doping organization which had results management World Anti-Doping Code • 2015128responsibility for the anti-doping rule violation to consider a reduction in the period of Ineligibility in light of the 2015  Code.