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 fo rth 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  16 shall  only be applied  retroactively  if the statut e of limitations  period  has not already  expired  by the Effective  Date).