The driver at no point saw or heard Corrie. She was standing behind debris which obstructed the view of the driver and the driver had a very limited field of vision due to the protective cage he was working in... The driver and his commanders were interrogated extensively over a long period of time with the use of polygraph tests and video evidence. They had no knowledge that she was standing in the path of the tractor. An autopsy of Corrie's body revealed that the cause of death was from falling debris and not from the tractor physically rolling over her. It was a tragic accident that never should have happened.