481 F.3d 839 Judith C. BRIGGS, Personal Representative for the Estate of Gregory Derringer, Deceased, Appellantv.WASHINGTON METROPOLITAN AREA TRANSIT AUTHORITY, et al., Appellees. No. 06-7037. United States Court of Appeals, District of Columbia Circuit. Argued January 22, 2007. Decided March 27, 2007. Appeal from the United States District Court for the District of Columbia (No. […]