On September 18, 2020, a three-judge panel of the Ninth Circuit U. S. Court of Appeals held in SEIU Local 121RN v. Los Robles Regional Medical Center, DBA Los Robles Hospital and Medical Center (Los Robles) that the power to decide whether a grievance is arbitrable in labor cases resides with the federal court and not the arbitrator absent “clear and unmistakable” evidence to the contrary. The Los Robles decision overturns the Ninth Circuit decision, United Bhd. Of Carpenters & Joiners of Am., Local No. 1780 v. Desert Palace, Inc. (Desert Palace), which held that in labor cases, an arbitrator must decide the issue of arbitrability if the agreement includes a broad arbitration clause even though the parties failed to specify their intent. The Los Robles decision is consistent with the unanimous U.S Supreme Court decision, Granite Rock Co. v. Int’l Bhd. of Teamsters (Granite Rock) which applied the same arbitrability framework to labor and commercial arbitration disputes, and rejected the assertion that the Federal Arbitration Act (FAA) “pro-arbitration policy” required that labor disputes be arbitrated “where evidence of the parties’ agreement to arbitrate the dispute [was] lacking.”