Confirmation Procedure  (CP):  An Analytical Testing  Procedure  that has the purpose of confirming the presence and/or, when applicable, confirming the concentration/ratio/score and/or establishing the origin (exogenous or endogenous) of one or more specific Prohibited Substances , Metabolite (s) of a Prohibited Substan ce, or Marker (s) of the Use of a Prohibited Substance  or Prohibited Method  in a Sample .