Fruit of the Poisonous Tree Quote

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The essence of a provision forbidding the acquisition of evidence in a certain way is that not merely evidence so acquired shall not be used before the Court, but that it shall not be used at all. Of course, this does not mean that the facts thus obtained become sacred and inaccessible. If knowledge of them is gained from an independent source they may be proved like any others, but the knowledge gained by the Government's own wrong cannot be used by it in the way proposed. 

Silverthorne Lumber Co. v. United States, 251 U.S. 385 (1920).