Williamson v. Mazda Motor of America, Inc., 562 U.S. 323 (2011), was a decision by the Supreme Court of the United States, in which the Court unanimously held that Federal Motor Vehicle Safety Standard 208, promulgated by the National Highway Traffic Safety Administration, does not federally preempt state tort lawsuits against auto manufacturers from injuries caused by a defective lack of certain types of seat belts.
The case arose when Thanh Williamson died in a 2002 auto accident from seat-belt related injuries. Williamson's family filed suit against Mazda Motor of America in California state court, claiming a defective design leading to a wrongful death. However, the California trial court dismissed the suit on the pleadings, agreeing with Mazda that the action was preempted by federal law, and the California Court of Appeal affirmed the dismissal. The California Supreme Court declined to review the case, but the U.S. Supreme Court accepted the Williamson's petition for certiorari.
In a unanimous decision handed down on February 23, 2011, the Court unanimously (8-0, with Justice Elena Kagan not taking part in this case) reversed the California courts and held that federal preemption does not apply. Justice Stephen Breyer wrote the decision of the court. Justice Sonia Sotomayor wrote a concurring opinion, and Justice Clarence Thomas wrote an opinion concurring in the judgment.
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