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A toxicologist is a scientist or medical personnel who specializes in the study of symptoms, mechanisms, treatments and detection of venoms and toxins; especially the poisoning of people. To work as a toxicologist one should obtain a degree in toxicology or a related degree like biology, chemistry or biochemistry. Bachelor's degree programs in toxicology cover the chemical makeup of toxins and their effects on biochemistry, physiology and ecology.
The toxicology testing performed after a person's death is known as forensic toxicology testing or postmortem drug testing. That's different from clinical toxicology, according to the College of American Pathologists. This is the drug testing an emergency room doctor would be likely to order, for instance, if a patient shows up with signs and symptoms of drug overdose or abuse.