Sometimes, the at-fault driver leaves the crash scene before the police arrive. If the victim and witnesses cannot identify them, and the police do not determine all the parties involved, seeking damages through a fault-based claim can get complicated. However, there is another option. Many drivers carry uninsured motorist coverage. Laws vary from state to state. However, many states require this policy. Others require drivers to opt out in writing. This leads to many people having the coverage even when it is optional. To recover compensation through your uninsured motorist policy, you must show that an uninsured or unidentified motorist caused your crash. Then, you must document your injuries, expenses, and losses. This allows you to negotiate with the insurance company with a good idea of how much your case might be worth.