For these purposes, the retrospective periods in which prior violations can be considered for purposes of multiple violations under A rticle 10.9.4 and the statute of limitations set forth in Article 16 are procedural rules, not substantive rules, and should be applied retroactively along with all of the other procedural rules in these Anti -Doping Rules (provided, however, that Article 1 6 shall only be applied retroactively if the statute of limitation period has not already expired by the Effective Date).