DURING A ONE TIME RENTAL PATROL FLIGHT, THE SHERIFF'S DEPUTIES AIR TAXIED THE HELICOPTER BY THE DISPATCH BUILDING AND AIMED THE HELICOPTER SPOTLIGHT IN THE WINDOW TO ALERT THE DISPATCHER THAT THEY WERE ATTEMPTING TO COMMUNICATE VIA PORTABLE RADIO. THE HELICOPTER BEGAN TO SPIN TO THE RIGHT AND AFTER SEVERAL REVOLUTIONS, THE PILOT IN COMMAND TOOK CONTROL FROM THE SECOND PILOT AND CUT POWER IN ORDER TO STOP THE SPIN. HE GUIDED THE HELICOPTER TO THE POLICE PARKING LOT BESIDE THE BUILDING AND COLLIDED WITH TWO VEHICLES PARKED IN THE LOT. THE TAIL ROTOR DRIVE AND CONTROL SYSTEM WERE NOT COMPROMISED IN THE ACCIDENT AND EXAMINATION PROVIDED NO EVIDENCE OF FAILURE OR MALFUNCTION. ACTUAL WIND CONDITIONS AT THE ACCIDENT SITE ARE UNKNOWN; HOWEVER, THE PILOT FLYING STATED THAT HE THOUGHT A WIND SHIFT OCCURRED AND HE WAS ATTEMPTING TO TURN INTO THE WIND WHEN CONTROL WAS LOST.