McCray v. Illinois

Background

A man arrested in Chicago was charged after police found heroin on him. He moved to suppress the drugs, arguing the officers searched him without a warrant. At the preliminary hearing the arresting officers said a confidential informant had told them the man had narcotics nearby. The defense sought the informant’s name, but the State objected and the judge sustained the objections. The motion to suppress was denied and the conviction was later affirmed by Illinois courts.

Reasoning

The Court considered whether Illinois’ rule allowing judges to protect an informant’s identity at a probable-cause hearing violated the Constitution. The majority held it did not because the officers testified in open court, under oath, and were cross-examined about what the informant said and why they trusted him. The judge was able to decide whether the officers’ testimony gave enough reason to arrest. The Court refused to require disclosure in every such hearing and distinguished these preliminary proceedings from a full criminal trial where different rules may apply.

Real world impact

States may continue to let judges keep informants’ names secret in early hearings if officers give detailed, testable testimony. That preserves a channel for people who inform on crimes and makes it easier for police to rely on confidential tips. At the same time, defendants will have less access to the informant’s identity when challenging arrests at the preliminary stage, although trial-stage demands for disclosure remain a separate issue.

Dissents or concurrances

Justice Douglas (joined by three Justices) dissented, warning the decision undermines the Fourth Amendment by allowing warrantless arrests based on untested informant claims and arguing disclosure is often necessary to test probable cause.