The Environmental Protection Agency said last week that it needed more time to study the health impacts of paraquat, a powerful herbicide that has drawn scrutiny for its possible links to Parkinson's disease, a move that would allow it to remain on the market. Several advocacy groups had sued the EPA over an interim registration decision it issued in 2021 ... on the grounds that it was not protective enough. In a statement, the EPA said additional data was necessary to resolve uncertainty around the risks of inhaling the herbicide. For as long as David Jilbert could remember, he wanted to be a farmer. For five years, Jilbert personally mixed, loaded and sprayed paraquat to control weeds in his vineyard. Then he began having difficulty tying his shoes and buttoning his shirts. He started to walk with a slow, shuffling gait around the winery. He was soon diagnosed with Parkinson's disease, a degenerative neurological disorder that affects motor functions and causes cognitive impairment, despite having no family history or genetic predisposition to the disease. He and his doctors blame paraquat. Jilbert is among the nearly 6,000 Americans who have filed lawsuits against Syngenta and Chevron, which distributed paraquat products in the United States until 1986. The suits allege that the companies failed to warn consumers about paraquat's substantial health risks. Paraquat ... is among the most widely used pesticides in the United States.