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 Prohi bited  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 Prohib ited 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 iden tified 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.