The same company that scrutinized former spy agency contractor Edward Snowden for a U.S. government security clearance said on Thursday it also checked the background of the Navy Yard shooter, allowing him to obtain a "secret" clearance. USIS, working as a contractor for the Office of Personnel Management (OPM), conducted a background review of Aaron Alexis, identified by law enforcement authorities as the shooter who killed 12 people at the Navy Yard before he was shot dead. "Today we were informed that in 2007, USIS conducted a background check of Aaron Alexis for OPM," USIS spokesman Ray Howell said in...