What are common poisons a forensic toxicologist looks for in CSI?

What are common poisons a forensic toxicologist looks for in CSI?

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Carbon monoxide, cyanide, and thallium are probably the more common non-drug poisons. I should add that these kind of toxic materials outside of carbon monoxide are not very common in today's day and age. Typically, forensic toxicologists will encounter drugs, particularly drugs of abuse when they're dealing with individuals who are suspected of overdosing.