On Lee v. United States

Background

On Lee ran a laundry in Hoboken and was tried for selling a pound of opium and conspiracy. A former employee, Chin Poy, visited and secretly wore a microphone. An agent outside tuned a receiver and listened to two conversations in the laundry and later on the sidewalk. Chin Poy was not called at trial; the agent testified about what he heard and the jury convicted On Lee.

Reasoning

The Court focused on whether using those overheard conversations violated the Fourth Amendment or the federal communications law, or whether courts should exclude such evidence to punish police misconduct. The majority held there was no unlawful search because Chin Poy entered with the defendant’s consent and no physical trespass by agents occurred. The Court treated the situation like ordinary eavesdropping and said the radio receiver was no different than listening from outside an open window. It also found no violation of the communications statute because the defendant did not use any communications system. Finally, the Court refused to create a broad exclusionary rule simply to penalize informers’ bad conduct.

Real world impact

The ruling allows prosecutors to use admissions captured by wired informants and agents listening nearby. It leaves challenges about an informant’s character and the way evidence was gathered to cross-examination and jury judgment. The decision does not overturn earlier wiretapping precedents and does not create a new rule excluding such evidence.

Dissents or concurrances

Several Justices dissented, warning that secret surveillance erodes privacy, encourages police misconduct, and urged stronger protections against electronic eavesdropping.