Retirees are being promised that they will be able to continue their health coverage for the rest of their lives, or until they turn 65 and qualify for Medicare…or until the employer changes their mind.  In the case M&G Polymers USA LLC vs. Tackett the collective bargaining agreement allowing for lifetime coverage has been challenged.  Rules about what must be said or what must be inferred when the agreement is otherwise silent are all under consideration here.