2.1.2  Sufficient proof of 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 Metabolites  or Markers  found in the first part of the split Sample  or the Athlete  waives analysis of the confirmation part of the split Sample.