Baldwin v. United States

Under Chevron deference, courts generally must adopt an agency's interpretation of an ambiguous statute if that interpretation is "reasonable." Chevron U.S. A. Inc. v. Natural Resources Defense Council, Inc. , 467 U.S. 837 , 844, 104 S.Ct. 2778 , 81 L.Ed.2d 694 (1984). Usually, the agency interprets the statute before any court has considered the question. But sometimes, the agency advances an interpretation after a court has already weighed in. In the latter instance, we have held that it "follows from Chevron " that a court must abandon its previous interpretation in favor of the agency's…