The statement that is true is that "toxicologists work with drugs or poisons after ingestion". Other statements in the question are false.
A toxicologist is classified as a scientist who analyzes chemicals and other materials to determine if they are toxic or damaging to humans, other living beings, or the environment. A toxicologist requires a strong understanding of numerous scientific disciplines, such as chemistry and biology. Analytical toxicology personnel work in labs to detect, classify, and analyze drugs and other potentially dangerous substances in body fluids for the purposes of poisoning diagnosis, treatment, and prevention. In an analytic toxicological laboratory, their main responsibility is to diagnose poisoning. Hence, the statement "toxicologists work with drugs or poisons after ingestion" is true.
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