I AM A POLICE OFFICER AND HAVE HAD SEVERAL OCCASIONS WHILE ON TRAFFIC STOPS, THAT MY ASSIGNED 2006 IMPALA HAS ROLLED BACKWARDS AFTER I HAD GOTTEN OUT OF THE CAR TO APPROACH A TRAFFIC VIOLATOR; I HAD TO JUMP BACK IN AND PUT IT BACK IN PARK.. ON 10/ 04/07 THIS CAR ALMOST COST ME MY LIFE. I BLOCKED AN ENTRANCE RAMP AND WHEN I GOT OUT OF THE CAR I STOOD BY THE OPEN DRIVER DOOR. THE CAR JUMPED INTO GEAR AND BACKED OVER ME. I WAS DRUG BACKWARDS AND COULD NOT FREE MYSELFAS I WAS BEING HELPLESSLY DRAGGED UNDER MY CAR. WHEN THE CAR WENT INTO THE MEDIAN IT DUG MY BODY INTO THE DIRT. I WAS ABLE TO ROLL FROM UNDERNEATH THE CAR. I THEN JUMPED BACK IN AND STOPPED THE CAR FROM CROSSING THE EXPRESSWAY. I HAVE BEEN ON THE STREETS AS A BEAT OFFICER FOR OVER 21 YEARS AND HAVE NEVER HAD ANYTHING LIKE THIS HAPPEN. I SPOKE WITH ANOTHER OFFICER AND HE ALSO HAS HAD THE SAME PROBLEM WHILE ON TRAFFIC STOPS. I WAS ADVISED BY FLEET MANAGEMENT THAT THERE HAS BEEN ONE OTHER INCIDENT REPORTED. MY PATROL CAR WAS TOWED ON OCT 8 AND LATER I WAS ADVISED BY FLEET MANAGEMENT THAT GM REPS LOOKED AT THE CAR AND FOUND NOTHING WRONG. FLEET MANAGEMENT PERSONNEL REFUSE TO GIVE ME ANY INFORMATION AS FOR A CONTACT PERSON WITH GM. NOTE -AS OF 10/19/07 THEY STILL HAVE THE CAR UNDER LOCK AND KEY. I SUSTAINED ROAD RASH, BRUISING, CERVICAL STRAIN, AND A POSSIBLE FRACTURE IN MY BACK. I HAVE CONTACTED MY LOCAL FRATERNAL ORDER OF POLICE PRESIDENT AND HE HAS BEEN GATHERING INFORMATION AS TO SEVERAL OTHER OFFICERS T