silver platter doctrine is a practice where federal agents rely on evidence seized by state officers in violation of the fourth amendment for use in federal court.
The weeks v. United States decision from 1914, which established the exclusionary rule for federal prosecutions, made an exception for evidence obtained by state officers during illegal searches. When the state gave the federal authorities the evidence on "a silver platter," as Justice Felix Frankfurter put it in Lustig v. United States (1949), the evidence was admissible in a federal trial. According to the rulings in Byars v. United States (1927) and Gambino v.
United States, even a state officer-only search that was performed with the intention of gathering evidence for the federal government resulted in the evidence being excluded in federal prosecutions (1927).
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