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As the length of time after an accident increases, thoughts and emotions distort what people believe the saw and heard. conversations with others further distort reality. After a while, the memory of everyone associated with the accident will be distorted in some way. with that in mind, I will say that it is extremely important to start your accident investigations as soon as it is safe and possible to do so immediately after the accident.
As soon as it's safe to access the scene and finding genuine witnesses bearing in mind the time scale.