Whose responsibility is it to make sure passengers wear seat belts?

It is the driver's responsibility to make sure all passengers are wearing seat belts before driving. In most jurisdictions, it is illegal for a driver to operate a vehicle with passengers who are not buckled up. Failure to comply with this law can result in fines or other penalties. Additionally, the driver may be liable for any injuries sustained by a passenger who was not wearing a seat belt in the event of an accident.