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On June 9, 2016, the Supreme Court decided Puerto Rico v. Sanchez Valle. Sanchez Valle was charged by Puerto Rico prosecutors with the illegal sale of weapons and ammunition without a license in violation of Puerto Rico law. While that charge was pending, he was indicted by a federal grand jury for the same offense, based on the same facts, under federal law. He pled guilty to the federal indictment but sought dismissal of the Puerto Rico charges on Double Jeopardy grounds, arguing that Puerto Rico is not a separate sovereign. The Supreme Court of Puerto Rico agreed but the Commonwealth appealed. The question before the U.S. Supreme Court was whether the Commonwealth of Puerto Rico and the federal government are separate sovereigns for purposes of the Double Jeopardy Clause of the United States Constitution.

By a vote of 6-2, the U.S. Supreme Court affirmed the judgment of the Supreme Court of Puerto Rico. Justice Kagan delivered the opinion of the Court, which held that the Double Jeopardy Clause bars Puerto Rico and the United States from successively prosecuting a single person for the same conduct under equivalent criminal laws. The majority opinion was joined by the Chief Justice and Justices Kennedy, Ginsburg, and Alito. Justice Ginsburg filed a concurring opinion, in which Justice Thomas joined. Justice Thomas filed an opinion concurring in part and concurring in the judgment. Justice Breyer filed a dissenting opinion, in which Justice Sotomayor joined.

To discuss the case, we have Lance Sorenson, who is the Olin-Searle Fellow in Constitutional Law at Stanford University.

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