2  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 .3  2.1.3   Excepting those substances for which a Decision Limit  is specifically identified in the Prohibited List  or a Technical Document , the presence of any reported quantity of a Prohibited Substance  or its Metabolites  or Markers  in an Athlete’s  Sample shall constitute an anti -doping rule violation.