 ANALYSIS BY CBS NEWS CONFIRMED HAS FOUND THE SECRET SERVICE COUNTER SNIPER TEAM CLOSEST TO THE SHOOTER LIKELY WOULD HAVE HAD THEIR LINE OF SIGHT TO THE BUILDING OBSCURED BY TREES, MAKING IT DIFFICULT FOR THEM TO SEE CROOKS CLEARLY. THE TEAM FARTHER AWAY FIRED THE SINGLE SHOT THAT KILLED HIM. MINUTES AFTER THE SHOOTING, CELL PHONE VIDEO CAUGHT THE FORMER PRESIDENT ARRIVING AT BUTLER MEMORIAL HOSPITAL. U.S. SECRET SERVICE AGENTS ARE SEEN WITH GUNS DRAWN AROUND HIS