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In page Ker–Frisbie doctrine:

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More recently, the Supreme Court relied on the Ker–Frisbie doctrine in United States v. Alvarez-Machain, 504 U.S. 655 (1992). Álvarez Machaín, a Mexican citizen, was abducted and brought to the United States at the direction of the Drug Enforcement Administration. The Court rejected the argument that such abductions undermine the usefulness of extradition treaties, and it refused to read general principles of international law weighing against such abductions into the Mexican extradition treaty.