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 firs t violation was  determined based on rules in force prior to the Effective Date, the period of Ineligibility  which would have been assessed for that first violation had these Anti -Doping Rules been applicable, shall be applied.73  24.7.6  Changes to the Proh ibited List and Technical Documents  relating to substances  or methods  on the Prohibited List shall not, unless they specifically provide otherwise, be applied retroactively.