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California man who blames terminal cancer on Roundup testifies at trial

A former school groundskeeper who blames his terminal cancer on the popular weed-killer Roundup has testified in his lawsuit against the herbicide's manufacturer, Monsanto. Dewayne "Lee" Johnson's case is the first of its kind to go to trial. Susie Steimle of CBS station KPIX-TV reports from San Francisco.
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