FORD EXPLORER POLICE WAS STATIONARY ON US HIGHWAY 59 NORTH. THE POLICE OFFICER IN THE DRIVER SEAT LOST CONSCIOUSNESS FOR APPROXIMATELY ONE HOUR AND 30 MINUTES. ANOTHER OFFICER CHECKED ON THE UNCONSCIOUS OFFICER AND FOUND HIM TO BE NOT ALERT AND UN RESPONSIVE, THEREFORE HE SUMMONED EMS AND REMOVED THE UNCONSCIOUS OFFICER FROM THE EXPLORER. EMS WAS ABLE TO GAIN CONSCIOUSNESS OF THE OFFICER BUT HE WAS DISORIENTED, UNAWARE OF WHERE HE WAS AND WHO HE WAS. OFFICER WAS PLACED ON OXYGEN AND TRANSPORTED TO LOCAL EMERGENCY ROOM WHERE HIS ARTERIAL BLOOD WAS TAKEN. ARTERIAL BLOOD WAS FOUND TO HAVE APPROXIMATELY 20% CONCENTRATION OF CARBON MONOXIDE. ARTERIAL BLOOD WAS TAKEN APPROXIMATELY ONE HOUR AFTER BEING REMOVED FROM THE EXPLORER AND 40 MINUTES OF BEING ADMINISTERED OXYGEN BY EMS.