MethadoneNarcoticsOpioid-Related DisordersOpiate Substitution TreatmentHeroin DependenceAnalgesics, OpioidBuprenorphineMethadyl AcetateOpiate AlkaloidsHeroinMorphineNaloxoneNeonatal Abstinence SyndromeSubstance Abuse DetectionReceptors, OpioidNarcotic AntagonistsCodeineSubstance Withdrawal SyndromeOpiumMorphine DerivativesReceptors, Opioid, muDrug OverdoseNaltrexoneStreet DrugsPyrrolidinesEnkephalinsEndorphinsSubstance-Related DisordersEtorphineSubstance Abuse, IntravenousDextropropoxypheneCyclazocineDiprenorphineCocaine-Related DisordersGas Chromatography-Mass SpectrometryDihydromorphineEnkephalin, Leucine-2-AlanineHydromorphoneMeconiumMorphine DependenceOxycodoneDrug ToleranceDose-Response Relationship, DrugStereoisomerismEnkephalin, LeucineEnkephalin, MethionineEthylketocyclazocineDrug InteractionsPainCocainePrisonersOxidoreductases, N-DemethylatingNalorphineTherapeutic CommunityHarm ReductionHydrocodonePupilAnalgesiaReceptors, Opioid, deltaDirectly Observed TherapyEnzyme Multiplied Immunoassay Technique