What is the Preferred Method For Confirmation Of Presumptive Positive From Initial Urine Screens?
Gas Chromatography, coupled with Mass Spectrometry, or GC/MS, has evolved as the preferred method for confirmation of a positive urine test. It provides the greatest level of specificity and, therefore, the greatest margin of certainty and legal defensibility. In addition, it is the only method which provides a documented data record suitable for review and interpretation by an outside expert.