For any serious vehicle accident, anything more than scratch in the paint, a LEO will do a report. ESPECIALLY if someone is seriously injured. In that report, there will be a determination as to who is responsible for the accident. If the LEO found someone to be responsible and doesn't take action, is he neglecting his duties as a LEO? He can lose his job if he does not do what his policies and proceedures require him to do. Even though he may not like it, he has to do it, because he will most likely be in court over it.