When you are in a car accident, the police officer responding to the accident does a thorough accident scene investigation to gather and preserve evidence you can use in a personal injury case. This is a common misconception that can impair your ability to recover full compensation for your injuries, damages, and losses. While a police officer does investigate the accident scene, he is doing so in order to determine if a traffic violation has occurred. This is a criminal investigation in order to issue a traffic ticket. A personal injury claim is a civil matter. The police report generated by the officer is not evidence because the police officer was not a witness to the collision. He can only make assumptions based on evidence at the accident scene and statement made by witnesses. Therefore, it is vital that an independent accident scene investigation is performed to identify, secure, and preserve key evidence that can prove the other driver was at fault for the collision.