Mass SpectrometryIsotopesIsotope LabelingTandem Mass SpectrometrySpectrometry, Mass, Electrospray IonizationGas Chromatography-Mass SpectrometryNitrogen IsotopesChromatography, LiquidReference StandardsChromatography, High Pressure LiquidCarbon IsotopesOxygen IsotopesSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationDeuteriumCalibrationReproducibility of ResultsProteomicsZinc IsotopesChromatography, GasSolid Phase ExtractionIndicator Dilution TechniquesSensitivity and SpecificitySubstance Abuse DetectionProteomeLimit of DetectionMolecular Sequence DataMicrochemistryForensic MedicineSpectrometry, Mass, Secondary IonAmino Acid SequenceDrug StabilityHairIron IsotopesRadioisotope Dilution TechniqueLiquid-Liquid ExtractionAnalytic Sample Preparation MethodsPeptidesIndicators and ReagentsFlame IonizationMolecular StructureQuality ControlSulfur IsotopesSpectrometry, Mass, Fast Atom BombardmentSpectrophotometry, UltravioletForensic ToxicologyTime FactorsMagnetic Resonance SpectroscopyKineticsElectrophoresis, Gel, Two-DimensionalProteinsElectrophoresis, CapillaryFood ChainReference ValuesAcetonitrilesChemical FractionationForensic SciencesOxidation-ReductionFood AnalysisDeuterium Exchange MeasurementPeptide MappingBiological AvailabilityIonsChromatography, Thin LayerChemistry Techniques, AnalyticalMetabolomicsMeprobamateAmino AcidsStereoisomerismChromatography, Reverse-PhaseBiotransformationHydrogenRadioactive TracersPeptide FragmentsHydrogen-Ion ConcentrationCattleLinear ModelsTrimethylsilyl CompoundsBiological MarkersLiverCarbon3,4-MethylenedioxyamphetamineNitrogenCarisoprodolStigmasterolBase SequenceProtein Processing, Post-TranslationalModels, BiologicalMethodsDeuterium OxideSpectrophotometry, AtomicForensic PathologyAlgorithmsAbsorptionProtein BindingTherapeutic EquivalencyRadiometric DatingIntestinal AbsorptionMethanolIsomerismCapillary Tubing