Drug Identification with Gas Chromatography Mass Spectrometry

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…of the prospective employee, and run the sample(s) through a GC/MS to determine if the possible employee has used drugs. They determine this by comparing mass chromatograms of known drugs with that of the test sample. The gas chromatograph/mass spectrometer is known as the best resource to prove the identification of a chemical substance, such as a drug, because of the mass chromatographs that act like a fingerprint of a chemical substance.