a The intensity of the poisoning effects depends on 1. the dose 2. the route of administration 3. individual differences 4. synergistic effects
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a 4 synergistic effects a Two poisons may combine to cause a much more lethal effect than the dose of either one by itself heroin taken with alcohol
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a The first task of forensic toxicologists detect the presence of the poison
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a Given that all substances can be poisons, mainly depending on the dose, in theory this means that an exceedingly broad range of substances with very different chemical natures may need to be tested for
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a There is no universal method of analysis for all substances
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