40  [Comment to Article 10.2.1.1: While it is theoretically possible for an Athlete or other Pers on 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 that i n a    WBF  2021 Anti -Doping Rules  Page 31 of 67     10.2.1.2   The anti -doping rule violation involves a Specified Substance  or a Specified Method and WBF  can establish that the anti -doping rule violation was intentional.