Also known as: uninvited ears · expectation of privacy · eavesdropping
Written by attorneys · grounded in primary & secondary sources — see below
An expectation of privacy against government eavesdropping on private conversations. The expectation arises when a speaker takes affirmative steps to exclude uninvited listeners from hearing the words spoken.
Ulysses Usher placed a lengthy call from his cell phone while driving across state lines. Officers later obtained months of his historical cell-site location information without a warrant to map his movements during the call. Because Ulysses took no steps to broadcast the conversation publicly, the data acquisition violated his expectation of privacy in the call's location details.
Uma Underwood stayed overnight at a friend's apartment and discussed sensitive business matters in the living room. Officers installed a listening device in the apartment without a warrant and captured the discussion. Uma's status as an overnight guest gave her a protected expectation that the conversation would remain free from uninvited electronic ears.
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Umar Underwood entered a phone booth, closed the door, and spoke quietly into the receiver about a confidential transaction. Officers placed a listening device on the outside of the booth and recorded the entire call without a warrant. Umar's actions of shutting the door demonstrated a subjective expectation that the words would not reach an uninvited ear.
Ulysses Ulrich, a high-school student, spoke privately with a classmate inside his locked school locker area about an upcoming test. School officials used a hidden microphone to record the exchange as part of a conduct investigation and turned the recording over to police. The locked space and closed conversation created a reasonable expectation against an uninvited ear even in the school setting.
Uriah Urban participated in a conspiracy meeting inside a private residence and discussed plans in lowered voices. Officers later obtained a wiretap on the home without showing Uriah's personal expectation of privacy. Uriah could not suppress the recording because he failed to establish that the conversation was shielded from an uninvited ear under his own Fourth Amendment rights.
Ulf Ulfsson rode as a passenger in a borrowed car and discussed private financial matters during the drive. Officers searched the car without a warrant and seized a recording device that had captured the conversation. Ulf lacked standing to challenge the recording because he had no personal reasonable expectation of privacy in the borrowed vehicle's interior against an uninvited ear.
No. The concept protects conversations when the speaker takes reasonable steps to keep the words private, even if the setting is not fully secluded from every possible person. Courts focus on whether the speaker manifested an actual expectation of privacy that society recognizes as reasonable.
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Yes, provided the speaker takes affirmative steps to exclude listeners, such as closing a phone-booth door or speaking in lowered tones in a restricted area. What a person knowingly exposes to the public lacks protection, but efforts to preserve privacy can still trigger Fourth Amendment safeguards.
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The doctrine originated in the context of electronic eavesdropping but reflects the broader principle that the Fourth Amendment protects people, not places, from unreasonable governmental intrusions into private conversations. The same expectation analysis governs both electronic and physical surveillance of spoken words.
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The speaker forfeits any reasonable expectation of privacy. Officers may then record or transmit the conversation without a warrant because the words were knowingly exposed to potential listeners, including government agents.
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…people, not places," Katz v. United States , 389 U. S. 347, 351 (1967), and wherever an individual may harbor a reasonable "expectation of privacy," id. , at 361 (MR. JUSTICE HARLAN, concurring), he is entitled to be free from unreasonable governmental intrusion. Of course, the specific content and incidents of this right must be…