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Toxicology is the fundamental science of poisons. A poison is generally considered to be any substance which can cause severe injury or death as a result of a physicochemical interaction with living tissue. However, all substances are potential poisons since all of them can cause injury or death following excessive exposure.

The name forensic toxicology implies that the science has a legal purpose as its basis. Forensic Toxicology is defined by the American Board of Forensic Toxicology as the study and application of toxicology to the purpose of the law.
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