Katz v. United States · ¶29

I agree that the official surveillance of petitioner’s telephone conversations in a public booth must be subjected to the test of reasonableness under the Fourth Amendment and that on the record now before us the particular surveillance undertaken was unreasonable absent a warrant properly authorizing it. This application of the Fourth Amendment need not interfere with legitimate needs of law enforcement.

U. S. Reports, bound volume
U. S. Reports, volume 389, at 347 (Library of Congress) · transcription: Caselaw Access Project
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