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