1  2.1.2  Sufficient  proof  of an anti-doping  rule violation  under  Article  2.1 is establi shed  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 th e 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 .2  2.1.3  Excepting those substances for w hich 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  viola tion.