Silverthorne Lumber Co. v. United States, 251 U.S. 385 (1920), was a U.S. Supreme Court decision in which Silverthorne had attempted to evade paying taxes. Federal agents illegally seized tax books from Silverthorne and created copies of the records. The ruling, delivered by Oliver Wendell Holmes Jr., was that any evidence obtained, even indirectly, from an illegal search was inadmissible in court. He reasoned that otherwise, police would have an incentive to circumvent the Fourth Amendment to obtain derivatives of the illegally obtained evidence.^[1] This precedent later became known as the "fruit of the poisonous tree doctrine,"^[2] and is an extension of the exclusionary rule.

Chief Justice Edward Douglass White and Associate Justice Mahlon Pitney dissented without a written opinion.

• List of United States Supreme Court cases, volume 251
• Wong Sun v. United States, 371 U.S. 471 (1963)

• Killian, B. J. (1982). "United States v. Crews: Fruit of the Poisonous Tree—A New Wrinkle?". Idaho Law Review. 18: 151. ISSN 0019-1205.

• Works related to Silverthorne Lumber Company v. United States at Wikisource
• Text of Silverthorne Lumber Co. v. United States, 251 U.S. 385 (1920) is available from: CourtListener Findlaw Google Scholar Justia Library of Congress