(March 10, 2020, 8:27 AM EDT) -- WASHINGTON, D.C. — The general counsel for Bayer US LLC, the parent company of Monsanto Co., which estimates that it faces litigation from at least 42,700 plaintiffs related to glyphosate, the active ingredient in the herbicide Roundup, joined corporate officers from other companies in signing a letter sent to the Office of the U.S. Courts, urging it to amend the federal rules of evidence regarding the admissibility of expert testimony....