Environmental toxicology expert witnesses may opine regarding toxic chemicals exposure, PCBs, forensic toxicology, and related matters. In the news, an Italian study found a link between certain chemicals and Parkinson’s disease. health.usnews.com reports their findings: “Prolonged exposure to pesticides, bug and weed killers, and solvents appears to raise the risk for developing Parkinson’s disease, a new study says.” Researchers reviewed more than 100 earlier studies regarding exposure and the risk of Parkinson’s.