2021 IFA Anti -Doping Rules ( October  2020)  Page 56 of 65    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 Effective Date based on an anti -doping rule violation which occurred prior to the Effective Date, shall be gove rned 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.