A trial In which a school groundskeeper alleged that his use of Monsanto Co.'s Roundup weedkiller caused his terminal cancer will go to a California jury after lawyers for both sides delivered their closing arguments yesterday.rnGroundskeeper Dewayne Johnson Is one of more than 5,000 plaintiffs across the United States who claim Monsanto's glyphosate-containing herbicides, Including the widely used Roundup, cause cancer. His case, the first to go to trial, began In San Francisco's Superior Court of California four weeks ago.
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