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The Supreme Court's recent arbitration law decisions reflect the Court's strong support for arbitration agreements, but also severely limit the states’ powers to police the fairness of arbitration. In particular, the Court’s decision in AT&T Mobility v. Concepcion, LLC expands the FAA preemption doctrine beyond its prior boundaries, signaling how far the Court is willing to go to support arbitration clauses at the expense of states’ rights and the values of federalism. This article explores the impact of AT&T Mobility on the preemption of state arbitration law, and the concomitant impact on the balance between state and federal power in the arbitration arena. This article argues that AT&T Mobility results in FAA over-preemption, as it unduly shifts arbitration law-making power away from the states, in violation of the FAA’s savings clause.