Source: Daniel Arkin, NBC NEWS, 10/28/17

Almost exactly a year ago, on Oct. 27, 2016, farm worker Allan Curtis Jones allegedly shot and killed soybean farmer Mike Wallace on a county road in Arkansas. The sheriff later told reporters that the two men had been arguing. Their dispute, the sheriff said, apparently revolved around a phenomenon known in the region as "dicamba drift."  The use of dicamba, a powerful weedkiller that some farmers spray on soybeans and cotton fields, has become increasingly 

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