(August 31, 2017, 2:57 PM EDT) -- BOSTON — Monsanto Co. on Aug. 22 filed a brief in the First Circuit U.S. Court of Appeals contending that a district court properly ruled that a town and school district failed to meet their burden of proof regarding alleged contamination from polychlorinatedbiphenyls (PCBs) that were manufactured by the company and are present in plasticizers that were used in the construction of a school building (Town of Westport, et al. v. Monsanto Company, No. 17-1461, 1st Cir.)....