Postmortem Toxicology: This involves the analysis of biological specimens collected during an autopsy to establish the presence of drugs, alcohol, or poisons that may have contributed to a death. Human Performance Toxicology: This area focuses on the effects of substances on human behavior and performance, particularly in cases involving impaired driving or workplace accidents. Forensic Drug Testing: This involves the screening and confirmation of drugs in biological samples, often used in legal and employment settings.