The period of Ineligibility  established in this Article 10.2.4.1  is not subject to any reduction based on any provision in Article 10.6 .42   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 that in a doping case under Article 2.1 an Athlete will be successful in proving that the Athlete acted unintentionally without establi shing the source of the Prohibited Substance.