The U.S. Supreme Court ruled today that courts may no longer defer to an agency’s interpretation of an ambiguous statute so long as that interpretation is reasonable, a practice that had been known as Chevron deference. Instead, the Court held that federal courts are obligated to exercise their independent judgment and determine and enforce the best interpretation of an ambiguous statutory provision. The 6-3 decision was authored by Chief Justice Roberts and will have significant ramifications in administrative law.