When someone acts in a negligent or a reckless manner and another person is seriously injured as a result of the incident in question, that injured person has legal rights and options that arise and that are available.
When someone makes the mistake of getting behind the wheel of a vehicle after causing a crash, that person is forcing danger on anyone who may be on the road at that time. When someone who has been drinking causes a crash, that person can face a whole host of legal troubles.