The bar he was involved in head on collision and was arrested for DWI I'm curious can any charges be made against the bar since his friend let him in. His friend is an employee of the establishment so he is their responsibility
Contact a member of the NC Assn for Justice in the county where the wreck happened. Yes the bar is liable and should have carded him. But if a friend let him in some of it's on your son. Regardless they shouldn't have served him to point of intox. But it's a weak case.
Others injured or killed have the best claims. Your son willingly participated.
To get additional information, look at Super Lawyers, for NC personal injury attorneys in your town or the closest big city. Ask for guidance.