Mealey's (September 10, 2019, 7:44 AM EDT) -- RICHMOND, Va. — The federal government is not immune from allegations that background check mistakes allowed Dylann Roof to buy a firearm and kill nine people in a South Carolina church in 2015, the Fourth Circuit U.S. Court of Appeals concluded Aug. 30, reversing and remanding a lower court decision (Felicia Sanders, et al. v. United States, No. 18–1931, 4th Cir., 2019 U.S. App. LEXIS 26416)....