title: False-positive immunochemical screen for methadone attributable to metabolites of verapamil.
authors.affiliation: DrugScan, Inc., Warminster, PA 18974, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Lichtenwalner
authors.forename: T
authors.initials: T
authors.lastname: Mencken
authors.forename: R
authors.initials: R
authors.lastname: Tully
authors.forename: M
authors.initials: M
authors.lastname: Petosa
mesh_terms: D002121:Calcium Channel Blockers / Q000652:urine*; D002851:Chromatography, High Pressure Liquid; D003429:Cross Reactions; D005189:False Positive Reactions; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D007124:Immunoenzyme Techniques; D008691:Methadone / Q000652:urine*; D009294:Narcotics / Q000652:urine*; D011933:Reagent Kits, Diagnostic; D015813:Substance Abuse Detection / Q000379:methods*; D014700:Verapamil / Q000652:urine*
chemical_list: D002121:Calcium Channel Blockers; D009294:Narcotics; D011933:Reagent Kits, Diagnostic; D014700:Verapamil; D008691:Methadone