Greenwire: In 1989, Supreme Court Justice Antonin Scalia -- then a recent arrival on the bench -- delivered an emphatic endorsement of a court practice of deferring to agencies' expertise. Speaking to Duke University School of Law that January, Scalia was 2 years into what would become three decades on the court. The topic: judicial deference to agency actions. Deeply interested in administrative law, he'd taught it as a law professor before joining the court. "Administrative law is not for sissies," he...