2  2.1.2   Sufficient proof o f an anti -doping rule violation under Article 2.1 is established by any of the following: presence of a Prohibited  Substance  or its Metabolites  or Markers  in the Athlete’s  A Sample  where the Athlete  waives analysis of the B Sample  and the B Sample  is not analyzed; or, where the Athlete’s  B Sample  is analyzed and the analysis of the Athlete’s  B Sample  confirms the presence of the Prohibited Substance  or its Metabolites  or Markers  found in the Athlete’s  A Sample ; or where the Athlete’s  A or B Sample  is split into two  (2) parts and the analysis of the confirmation part of the split Sample  confirms the presence  of the  Prohibited Substance  or its   2  [Comment to Article 2.1.1: An anti -doping rule violation is committed under this Article without regard to an Athlete’s Fault.