10.2  Ineligibil ity for Presence, Use or Attempted Use , or Possession of a Prohibited Substance  or a Prohibited Method   The period of Ineligibility  for a violation of Articles 2.1, 2.2 or 2.6 shall be as follows, subject to potential reduction or suspension pursuant to Articles 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 , unless the Athlete  or other Person  can establish that the anti -doping rule violation was not intentional.