You should always contact law enforcement following a car accident. In some cases, the at-fault driver could ask you not to contact the police, telling you they will simply pay the damages out-of-pocket. This is extremely risky, as the at-fault driver may not have auto insurance or could have been impaired at the time of the accident. You need a police report to help you show who was at fault andto be able to collect damages from the negligent driver’s insurance.