Investigation into Canada’s New Brunswick brain syndrome is being blocked by the province, whose claims that the syndrome is various existing diseases have been debunked by federal experts, who suggest that the provincial government controlled by its forestry industry is blocking the investigation to retain tourism and industry.
Figuring out the Parkinson’s linkage is challenging too, because glyphosate is just one of many chemicals used in agricultural settings. It wouldn’t be surprising for the correlation to be caused by another chemical with strong evidence of casual linkage to Parkinson’s that itself is correlated with glyphosate, like Parquat. (Since Parquat is a herbicide, places that used it may also use (or have switched to) glyphosate.) Totally worth continued scientific study.