Facts
- Federal narcotics agents used an informant, Harvey Jackson, to meet with James A. White in several locations, including White’s home, Jackson’s home, a restaurant, and Jackson’s automobile.
- Jackson wore a concealed radio transmitter with the government’s knowledge and consent.
- Agents stationed nearby listened to the conversations contemporaneously through radio receivers.
- Jackson was unavailable at trial.
- Over White’s objection, the trial court allowed monitoring agents to testify about the conversations, which contained incriminating statements regarding narcotics activity.
- The Seventh Circuit reversed the conviction, treating intervening Fourth Amendment doctrine as barring the agents’ testimony.
- The Supreme Court granted certiorari.
Issues
- Whether the Fourth Amendment requires a warrant to admit agents’ testimony about conversations they overheard in real time through a transmitter worn by a consenting informant.
- Whether the informant’s unavailability to testify makes the warrantless monitoring and resulting agent testimony inadmissible under the Fourth Amendment.
- Whether later Fourth Amendment doctrine governed the admissibility of pre-decision informant-transmitter monitoring.
Decision
- The Supreme Court reversed the Seventh Circuit and reinstated the conviction.
- A plurality concluded that warrantless contemporaneous monitoring of a defendant’s conversations through a transmitter worn by a consenting informant does not violate the Fourth Amendment, even when the conversations occur in a home.
- The informant’s unavailability did not create a Fourth Amendment bar to agents testifying about what they overheard.
- The Court also relied on nonretroactivity principles to reject applying later doctrine to invalidate the surveillance at issue.
Legal Principles
- A speaker assumes the risk that a person to whom the speaker voluntarily talks is an informant who will disclose the conversation to the government.
- Fourth Amendment analysis does not turn on whether the government learns the conversation through an informant’s later report, an informant’s notes, or contemporaneous electronic transmission facilitated by the informant.
- When a consenting participant enables the government to hear the conversation, the additional use of transmitting equipment is not treated as a separate Fourth Amendment intrusion requiring a warrant.
- The informant’s absence at trial does not, by itself, convert lawful informant-based monitoring into an unreasonable search or seizure under the Fourth Amendment.
- Intervening Fourth Amendment decisions were not applied retroactively to suppress evidence obtained under prior governing rules.
Conclusion
The Court held that the Fourth Amendment does not prohibit the government from introducing agents’ testimony about conversations overheard through a concealed transmitter worn by a consenting informant without a warrant, and it reinstated White’s conviction despite the informant’s unavailability at trial.