24.7.5  For purposes of assessing the period of Ineligibility for a second violation under Article  10.9.1,  where  the sanction  for the first violation  was determined  based  on rules in force prior to the Effective Date, the period of Ineligibility which woul d have been assessed for that first violation had these Anti -Doping Rules been applicable, shall be  applied.73  24.7.6  Changes  to the Prohibited  List and Technical  Documents  relating  to substances or methods on the Prohibited List shall not, unless they specifica lly provide otherwise,  be applied  retroactively.