For these purposes, the retrospective periods in which prior violations can be considered for purposes of multiple violations under Article 10.9.4 and the statute of limitations set forth in Article 17 are procedural rules, not substantive rules, and should be applied retroactively along with all of the other procedural rules in the 2021 Code (provided, however, that Article 17 shall only be applied retroactively if the statute of limitations period has not already expired by the Effective Date).27.3 Application to Decisions Rendered Prior to the 2021 CodeWith 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 responsibility for the anti-doping rule violation to consider a reduction in the period of Ineligibility in light of the 2021 Code.