For these purposes, the retrospective periods in which prior violations c an be considered for purposes of multiple violations under Article 10.9.4 and the statute of limitations set forth in Article 1 6 are procedural rules, not substantive rules, and should be applied retroactively along with all of the other procedural rules i n these Anti -Doping Rules (provided, however, that Article 1 6 shall only be   IOF Anti-Doping Rules  Page 58 of 66    applied retroactively if the statute of limitations  period has not already expired by the Effective Date).