(August 18, 2017, 4:56 PM EDT) -- GREENVILLE, Miss. — The U.S. Environmental Protection Agency on Aug. 11 filed a brief in Mississippi federal court arguing that three subpoenas issued for employees of the EPA related to a groundwater contamination lawsuit should be quashed (Joe E. Sledge, et al. v. Meritor Inc., et al., No. 16-CV-053, N.D. Miss.)....