T. M. v. University of Md. Medical System Corporation · ¶113

In any event, Congress has already made the federalism calculus, and this Court is not free to override it. As Exxon recognizes, the Full Faith and Credit Act—which the Court does not mention—requires federal courts to give state judgments the effect that they would have in state courts. 544 U. S., at 293; see Lance, 546 U. S., at 466 (“Congress has directed federal courts to look principally to state law in deciding what effect to give state-court judgments”). So even if the Court could otherwise ignore state law in the name of federalism, Congress has foreclosed that path.

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