The Missouri Supreme Court has upheld a law that allows alcohol liability lawsuits against bars and restaurants but blocks suits against convenience and grocery stores — rejecting a claim that the distinction was unconstitutional.

A suburban St. Louis mother sought to sue the convenience store that sold her 20-year-old son a 12-pack of beer the night before his fatal 2004 car accident. But a trial judge dismissed the lawsuit, and the Supreme Court agreed that she had no grounds to sue under Missouri law.