Supreme Court Limits Deference Owed to Agency Interpretations of Regulations
Last month, a bare majority of the Supreme Court held in Kisor v. Wilkie, No. 18-15, 588 U.S. ___, that federal courts should still defer to an agency’s interpretation of its own regulations, a practice known as Auer deference, but only sometimes. In doing so, the Supreme Court narrowed the circumstances in which Auer deference is warranted by adopting a new five-part test that must be satisfied for it to apply. The decision has important ramifications for environmental practitioners because of the significance of regulations in environmental law.
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