Wading into the confusing abyss of administrative law, on June 28 the U.S. Supreme Court, by a 6-3 vote, overruled the much-criticized 1984 decision in Chevron, restoring the bedrock principle — commanded by both Article III of the Constitution and Section 706 the 1946 Administrative Procedure Act — that it is the province of courts, not administrative agency bureaucrats, to interpret federal laws. This may sound like an easy ruling, but the issue had long bedeviled the Supreme Court. Even Justice Antonin Scalia, an administrative law expert,...