## Facts

- The IRS Manual required prior authorization, including Justice Department approval in non-emergency situations, before engaging in consensual electronic monitoring of face-to-face conversations with taxpayers.
- During an audit of Alfredo Caceres and his wife, an IRS agent met with Caceres on January 31 and February 6, 1975.
- The agent wore a concealed transmitter; other agents monitored and recorded the conversations.
- IRS personnel obtained internal “emergency” approval, but no Justice Department authorization was obtained for the monitoring of the January 31 and February 6 meetings.
- In the recorded meetings, Caceres paid or offered money to the IRS agent in exchange for favorable treatment in the audit.
- Caceres was charged with bribery and moved to suppress the recordings because the IRS did not follow its own monitoring regulations.

## Issues

1. Whether recordings and monitoring-agent testimony must be excluded in a criminal prosecution solely because IRS agents violated internal IRS regulations governing consensual electronic surveillance, where no constitutional or statutory requirement mandated those procedures.

## Decision

- The Supreme Court reversed the Ninth Circuit in a 7–2 decision (Justice Stevens).
- The Court held the recordings and the testimony of monitoring agents were not required to be excluded merely because IRS regulations were violated.
- The Court found no independent constitutional violation from consensual monitoring and no statutory basis requiring suppression as a remedy for the internal regulatory breach.
- The Court rejected due process and equal protection arguments premised on the agency’s failure to follow its own internal procedures.

## Legal Principles

- Courts must enforce agency regulations when the regulation is mandated by the Constitution or federal statute; absent such grounding, a regulatory violation does not automatically trigger judicial exclusion of evidence.
- Consensual electronic monitoring (recording/transmitting a conversation with the consent of one participant) does not, by itself, violate the Fourth Amendment.
- The exclusionary rule is generally aimed at deterring constitutional violations and is not extended to every breach of internal agency rules where no constitutional or statutory right has been infringed.
- Unequal application of internal agency approval procedures, without more, does not establish a due process or equal protection violation requiring suppression.

## Conclusion

The Court held that evidence obtained through consensual monitoring is admissible even if agents failed to comply with internal IRS approval requirements, because the violated procedures were not constitutionally or statutorily required and no independent constitutional right was infringed.


United States v. Caceres, 440 U.S. 741 (1979)