Karen McCormack, a retired Environmental Protection Agency (EPA) scientist who spent 40 years with the agency, told Al Jazeera's investigative show Fault Lines that she believed the EPA was not fulfilling its mission to protect the public from harmful chemicals. "In the last three decades that I have worked at EPA it has been very rare for a toxic pesticide to be taken off the market," she told Fault Lines. "Just about every, every new pesticide application that is submitted to the agency is approved, no matter how high the risk." As the Al Jazeera report notes, paraquat is banned in 58 countries but its use is on the rise in the United States. The Guardian's Paraquat Papers, published in 2022 in collaboration with the New Lede, exposed years of corporate efforts to cover up paraquat's links to Parkinson's disease, mislead the public, challenge published scientific literature and influence the EPA. Dr Deborah Cory-Slechta, a prominent researcher, told Al Jazeera: "There is a very strong and compelling body of evidence based on the epidemiology studies and what we know from animal models of Parkinson's disease" that paraquat causes changes in the brain that lead to Parkinson's. As revealed by the Guardian, in 2005 Syngenta worked behind the scenes to keep Cory-Slechta from sitting on an EPA advisory panel, deeming her a threat to paraquat. Company officials wanted to make sure the efforts could not be traced back to Syngenta, the documents showed.