ITTF  2021 Anti -Doping Rules  Page 12 of 61 Specified Method  unless it is specifically identified as a Specified Method  on the Prohibited List.19  4.2.3  Substances of Abuse    For purposes of applying Article 10, Substances of Abuse  shall include those Prohibited Substances  which are specifically identified as Substances of Abuse  on the Prohibited List  because they are frequently abused in society outside of the context of sport.