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 Prohibit ed 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  responsibilities according to Code Article 21.3.