10.2 Ineligibility  for Presence, Use or Attempted Use , or Possession of a Prohibited Substance  or Prohibited Method   The period of Ineligibility  for a violation of Article 2.1  (Presence of a Prohibited Substance ), 2.2 (Use or Attempted  Use) or 2.6  (Possession  of a Prohibited Substance  or a Prohibited Method ) shall be as follows, subject to potential elimination, reduction or suspension pursuant to Article 10.5, 10.6 or 10.7:   10.2.1   The period of Ineligibility , subject to Article 10.2.4,  shall be four (4) years where:   10.2.1.1   The anti -doping rule violation does not involve a Specified Substance  or a Specified Method , unless the Athlete  or other Person  can establish that the anti -doping rule violation was not intentional.43  10.2.1.2   The anti -doping rule violation involves a Specified Substance  or a Specified Method and TWIF  can establish that the anti -doping rule violation was intentional.