24.7.2  Any anti -doping rule violation case which is pending as of the Effective Date and any anti -doping rule violation case brought after the Effect ive Date based on an anti-doping rule violation which occurred prior to the Effective Date , shall be governed by the substantive anti -doping rules in effect at the 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 mitior” appropriately applies under the circumstances of the case.