The authorized evidence is referred as laws for solving problems in car accident cases. Expert witnesses must be practiced by the Court, based on the potential expert’s trainings and the values set from lawful guide. To be qualified as an expert in a car accident case, a person must have an adequate information, instruction, preparation, or knowledge concerning the detailed matter when the court was to qualify the expert to give a consistent judgment on a related question. The experiences of the skilled lawyer are not the determining issues and the individual will have enough qualification in laws. Based on certain conditions and statements the judgment is provided by the judge.