In addition, the records show company scientists were aware of evidence that exposure to paraquat could impair the central nervous system (CNS), triggering tremors and other symptoms in experimental animals similar to those suffered by people with Parkinson's. A 1975 Chevron communication speaks of concerns about allegations of "permanent CNS effects from paraquat".
And as independent researchers continued to find more and more evidence that paraquat may cause Parkinson's, the documents describe what Syngenta called an "influencing" strategy "that proactively diffuses [sic] the potential threats that we face" and seeks to "maintain and safeguard paraquat registrations", referring to their regulatory approvals. The strategy "must consider how best to influence academia, and regulatory and NGO environments"…
https://www.theguardian.com/us-news/2022/oct/20/syngenta-weedkiller-pesticide-parkinsons-disease-paraquat-documents
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