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Detection and analysis of paraquat in confiscated marijuana samples.

A spectrophotometric method used to test for paraquat in 160 confiscated marijuana samples is described. Twenty of these samples (12.5 per cent) tested positive for paraquat. Nine confiscated hash oil samples tested negative. The identification of paraquat was proven by isolation, chromatography, and spectral methods. The cannabinoids in paraquat positive Cannabis samples were analysed.