The United States Supreme Court recently resolved a Circuit Court split on the appropriate standard of review of a District Court’s decision whether to enforce a subpoena issued by the Equal Employment Opportunity Commission (“EEOC”). In McLane Co., Inc. v. Equal Employment Opportunity Commission, No. 15-1248, 581 U.S. __ (April 3, 2017), the Court held that such a decision should be reviewed only to determine whether the District Court abused its discretion – a deferential standard of review. This conclusion was fairly uncontroversial. Indeed, the abuse of discretion standard has long been used for review of decisions whether to enforce administrative subpoenas (such as those issued by the National Labor Relations Board). Historically, however, the Ninth Circuit alone has used a de novo standard of review in these circumstances, while the seven other U.S. Courts of Appeal to have addressed this issue all applied the more deferential standard. The Ninth Circuit panel itself questioned why de novo review applied, in light of the substantial authority to the contrary, and the Supreme Court took the case to resolve this circuit split.