M&G Polymers USA, LLC v. Tackett, a recent unanimous decision by the Supreme Court of the United States, is a game changer. By expressly repudiating the U.S. Court of Appeals for the Sixth Circuit’s 1983 Yard-Man decision and the many decisions following it, the Supreme Court rejected three decades of Sixth Circuit law inferring that retiree health benefits are vested for retirees’ lives, and provided new clarity in interpretation of retiree medical benefits under collective bargaining agreements.

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