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Solid-phase micro-extraction–gas chromatography–mass spectrometry and headspace-gas chromatography of tetrahydrocannabinol, amphetamine, methamphetamine, cocaine and ethanol in saliva samples

Cannabis UseSubstance AbusePsychoactive DrugSubstance UseGas ChromatographyMedicineMass SpectrometryForensic ToxicologySaliva SamplesHeadspace-gas ChromatographyDrug TestAnalytical ChemistryForensic ChemistryClinical ChemistryPharmacologyCannabinoid PharmacologyChromatographyDrug Analysis