Altunkaya D, Clatworthy A J, Smith R N, Start I J
Metropolitan Police Forensic Science Laboratory, London, U.K.
Forensic Sci Int. 1991 Jul-Aug;50(1):15-22. doi: 10.1016/0379-0738(91)90128-6.
Eight-eight urine samples were analysed by the EMIT d.a.u. Cannabinoid 20 ng homogeneous enzyme immunoassay, the DPC cannabinoid radioimmunoassay, two in-house cannabinoid radioimmunoassays and a gas chromatography-mass spectrometry method for 11-nor-9-carboxy-delta 9-tetrahydrocannabinol. There was good qualitative agreement between the methods with few discrepancies in the borderline region.