The time you have to sue after a personal injury varies from one state to another. The period of time, called the statute of limitations, can be as short as one year, meaning that if you wait one day longer than 365 days after the injury to file a law suit, it is too late. Other states have statutes of limitations as long as three or even four years. In nearly every state there are special circumstances which will "stop the clock" from ticking away the period of time. For example, in some states, if the person you want to sue has left the country making it impossible for you to sue, then the clock stops while they are out of the country and starts again when they come back. You really have to ask a local lawyer of ask the Clerk of the Court.