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Monitoring opioid and benzodiazepine use and abuse: Is oral fluid or urine the preferred specimen type?

Opioid EpidemicSubstance AbuseSubstance UseHealth SciencesPsychiatryAddictionMedicineForensic ToxicologyOral FluidDrug TestAddiction MedicineDrug MonitoringOpioid OverdoseBenzodiazepine UsePharmacologyPreferred Specimen TypeOpioid Use DisorderDrug Analysis