]*C40* [Comment to Article 10.2.1.1: While it is theoretically possible for an Athlete or other Person to establish that the anti-dopingrule violation was not intentional without showing how the Prohibited Substance entered one’s system, it is highly unlikely that in adoping case under Article 2.1 an Athlete will be successful in proving that the Athlete acted unintentionally without establishing thesource of the Prohibited Substance.