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 Substance , or Marker(s)  of the Use of a Prohibited Substance  or Prohibited Method  in a Sample .