Mapp exclusionary rule quote
The Court concluded that it was therefore obliged to hold, although it chose the narrower ground on which to do so, that all evidence obtained by an unconstitutional search and seizure was inadmissible in a federal court regardless of its source. Today we once again examine Wolf's constitutional documentation of the right to privacy free from unreasonable state intrusion, and, after its dozen years on our books, are led by it to close the only courtroom door remaining open to evidence secured by official lawlessness in flagrant abuse of that basic right, reserved to all persons as a specific guarantee against that very same unlawful conduct. We hold that all evidence obtained by searches and seizures in violation of the Constitution is, by that same authority, inadmissible in a state court.
Mapp v. Ohio, 367 U.S. 643 (1961)