24.7.2  Any anti -doping rule violation case which is pe nding as of the Effectiv e 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, shall be governed by th e substantive anti -doping rules in effect at t he time the alleged anti -doping rule violation occurred, and not by the substantive anti -doping rules set out in these Anti-Doping Rules, unless the panel hearing the case determines the principle of “lex mitio r” appropriately applies under the circumstanc es of the case.