Missouri pesticide poisoning expert witnesses assess toxic exposures from agricultural and residential chemicals and clarify diagnosis, treatment, and causation. They often come from medical toxicology, occupational medicine, emergency care, and environmental health, with experience in farm and grain-handling regions across the state. Many draw on Missouri Poison Center protocols and regional hospital practices. They evaluate exposure pathways, symptom timelines, biomonitoring, and long-term neurologic or respiratory effects.