Chromatography, High Pressure LiquidChromatography, GasGas Chromatography-Mass SpectrometryChromatography, LiquidChromatography, AffinityChromatography, GelChromatographyChromatography, Ion ExchangeChromatography, Thin LayerIndicators and ReagentsMass Spectrometryo-PhthalaldehydeSpectrometry, Mass, Electrospray IonizationTandem Mass SpectrometryChromatography, Reverse-PhaseFluoroacetatesSubstance Abuse DetectionCalibrationTrimethylsilyl CompoundsSpectrophotometry, UltravioletMolecular WeightReference StandardsReproducibility of ResultsSolid Phase ExtractionAcetic AnhydridesLimit of Detection3,4-MethylenedioxyamphetaminePentanonesMolecular StructureChromatography, DEAE-CelluloseSpectrometry, FluorescenceStereoisomerismElectrophoresis, Polyacrylamide GelAmino AcidsSensitivity and SpecificityTrifluoroacetic AcidFlame IonizationForensic MedicineMolecular Sequence DataAmino Acid SequenceAnhydridesKineticsHydrogen-Ion ConcentrationCarboxylic AcidsMicrochemistryDansyl CompoundsFormic Acid EstersAminesChromatography, AgaroseElectrophoresis, CapillarySulfhydryl CompoundsAnalytic Sample Preparation MethodsChemistryHexanesSpectrometry, Mass, Fast Atom BombardmentMagnetic Resonance SpectroscopyChemical PhenomenaPhenylhydrazinesCattleSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationPyrenesChemical FractionationDimethylaminesAldehydesDrug StabilitySolventsHydrolysisPeptidesCarbohydrate SequenceAnion Exchange ResinsFood AnalysisIsomerismKetonesAcetonitrilesFluorescent DyesBromineMethamphetamineOxidation-ReductionAzidesPhosphoranesChromatography, PaperCarbodiimidesSubstrate SpecificityPolysaccharidesFluorescence Polarization ImmunoassayTemperatureOligosaccharidesAmphetaminesChemistry Techniques, AnalyticalCarisoprodolCarbohydratesLiquid-Liquid ExtractionElectrochemistry4-Chloro-7-nitrobenzofurazanDeuteriumAlkylationThiohydantoinsHistocytological Preparation TechniquesDrug ResiduesTrypsin