Mass SpectrometryTandem Mass SpectrometrySpectrometry, Mass, Electrospray IonizationChromatography, High Pressure LiquidChromatography, LiquidBody Mass IndexGas Chromatography-Mass SpectrometrySensitivity and SpecificityReference StandardsCalibrationSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationProteomicsSubstance Abuse DetectionForensic MedicineChromatography, GasIsotope LabelingMolecular Sequence DataPolymerase Chain ReactionLimit of DetectionMicrochemistryMethodsTime FactorsIndicators and ReagentsEvaluation Studies as TopicChromatography, Reverse-PhaseSpectrophotometry, UltravioletProteomeAmino Acid SequenceSolid Phase ExtractionDrug StabilityRadioimmunoassayChemistry Techniques, AnalyticalKineticsFlame IonizationElectrophoresis, CapillaryEnzyme-Linked Immunosorbent AssayMolecular WeightForensic ToxicologyPeptidesProteinsBase SequenceImmunoassayElectrophoresis, Polyacrylamide GelQuality ControlRNA, MessengerLiverReference ValuesChromatography, Thin LayerMolecular StructureDensitometryCattleCodeineImage Processing, Computer-AssistedIsotopesMorphine DerivativesReagent Kits, DiagnosticDNAAmphetaminesCell LineRabbitsSpecimen HandlingDNA PrimersStaining and LabelingBiological MarkersDNA, ViralSpectrometry, Mass, Secondary IonTomography, Emission-ComputedBody CompositionChromatography, Ion ExchangeVirologyIndicator Dilution TechniquesFluorescent DyesObesityHairOxygen IsotopesAlgorithmsMass ScreeningReverse Transcriptase Polymerase Chain ReactionLinear ModelsBody WeightMagnetic Resonance SpectroscopyIodine RadioisotopesHydrocodoneAntibodies, MonoclonalImmunoenzyme TechniquesElectrophoresis, Gel, Two-DimensionalPeptide MappingPeptide FragmentsDrug ContaminationCells, CulturedRNA, ViralViral LoadTrimethylsilyl CompoundsOxymorphoneIsomerismDeuteriumTissue DistributionBlood ProteinsTaq PolymeraseIons