UCI CYCLING REGULATIONS   Page 61 of 70 UCI ADR 2021   Non-Retroactive except for Articles 10.9.4 and 17 or Unless Principle of “Lex Mitior” Applies  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 governed by the substantive anti -doping rules in effect at the time the alleged anti -doping rule vio lation occurred, and not by the substantive anti -doping rules set out in these Anti -Doping Rules or the Code , unless the panel hearing the case determines the principle of “lex mitior” appropriately applies under the circumstances of the case.