There is no federal seat belt law. Except for New Hampshire, every state has a seat belt requirement for adults.  Furthermore, all 50 states and the District of Columbia have seat belt laws covering children.  A primary law allows police to stop an automobile and ticket the driver for not wearing a seat belt.  In U.S., seventeen states and the District of Columbia have primary laws for seat belt requirement.  Secondary laws allow the police to ticket a driver who is not wearing a seat belt, when the police have already stopped the driver for some other reason.