The FAA pre-empts state laws prohibiting contracts from barring class-action arbitration. Decided April 27, 2011 (argued November 9, 2010). Opinion of the Court: Antonin Scalia → go there Dissenting: Breyer. Topic: Businesses/Corporations/Contracts. AT&T Mobility LLC v. Concepcion, 563 U.S. 333 (2011), is a case that was decided by the United States Supreme Court. On April 27, 2011, the Court ruled, by a 5–4 margin, that the Federal Arbitration Act of 1925 preempts state laws that prohibit contracts from disallowing class-wide arbitration, such as the law previously upheld by the California Supreme Court in the case of Discover Bank v. Superior Court. As a result, businesses that include arbitration agreements with class action waivers can require consumers to bring claims only in individual arbitrations, rather than in court as part of a class action. Wiki link