(December 22, 2015, 11:59 AM EST) -- RICHMOND, Va. — A widow and five defendants on Dec. 9 argued before the Fourth Circuit U.S. Court of Appeals over the level of circumstantial evidence of asbestos exposure required to overcome summary judgment (Lisa Covington, et al. v. MCIC Inc., et al., No. 14-2055, 4th Cir.)....