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Detecting organic toxins in possible fatal poisonings--a diagnostic problem.

Two fatal cases are reported where there was strong circumstantial evidence of plant toxin ingestion. In only one case however was a low urine level of hyoscine detected (in keeping with a history of Datura sp. consumption). Fatal cases of plant toxin ingestion may be a problem for the laboratory given the wide range and rarity of certain plant poisons, and the limitation of standard screening. Identification of plant materials at the scene of suspected poisoning may be crucial in directing toxicological investigations.