40  [Comment to Article 10.2.1.1: While it is theoretically possible for an Athlete or other Person to establish that the anti -doping rule violation was not intentional without showing how the Prohibited Substance entered one’s system, it is highly unlikely   ITTF  2021 Anti -Doping Rules  Page 27 of 61  10.2.1.2   The anti -doping rule violation involves a Specified Substance  or a Specified Method  and ITTF  can establish that the anti -doping rule violation was intentional.