ISL – January 2021 Page 122 of 160 6.2.2.3 EQAS  Samples Containing Prohibited Substance(s) , their Metabolite(s)  or Marker(s) , or the Marker(s)  of Prohibited Method(s)  The concentration(s) of selected Analyte (s) are those that may be encountered in the urine or blood after Use of Prohibited Substance (s) or Prohibited Method (s).