title: Interference in GC/MS confirmation of delta-9-tetrahydrocannabinol-9-carboxylic acid by a secondary tetrahydrocannabinol metabolite.
authors.forename: B I
authors.initials: BI
authors.lastname: Podkowik
authors.forename: D J
authors.initials: DJ
authors.lastname: Kippenberger
authors.forename: M L
authors.initials: ML
authors.lastname: Smith
mesh_terms: D013759:Dronabinol / Q000031:analogs & derivatives* / Q000737:chemistry / Q000652:urine*; D008401:Gas Chromatography-Mass Spectrometry; D006801:Humans; D011863:Radioimmunoassay
chemical_list: D013759:Dronabinol; C025351:delta(9)-tetrahydrocannabinolic acid