Cooper v. California

Background

A man was convicted of selling heroin after police introduced a torn piece of brown paper found in his impounded car’s glove compartment. Officers had seized and held the car under a California law that requires vehicles used with narcotics to be kept as evidence until forfeiture is decided. The California appellate court relied on an earlier case (Preston) to call the search unconstitutional but said the error was harmless under state law; the State’s high court declined review, and the case reached the United States Supreme Court.

Reasoning

The central question was whether a warrantless search of a car validly seized and held as evidence under the state forfeiture law was unreasonable under the Fourth Amendment. The Court distinguished Preston, noting that in this case the seizure and custody were directly tied to the narcotics arrest and statutory forfeiture process. Given that the vehicle had to be kept as evidence for months, the Court found the officers’ search reasonably related to that custody and therefore not a federal constitutional violation. The Court also rejected the claim that the accused’s right to confront the informer deprived him of a fair trial.

Real world impact

The ruling means officers may examine vehicles legally impounded under similar state forfeiture statutes and use what they find in prosecutions without automatically triggering Fourth Amendment exclusion. States remain free to require greater protections than the federal Constitution provides, and state courts may still apply their own harmless-error rules to state-law mistakes.

Dissents or concurrances

Justice Douglas, joined by three Justices, warned this decision conflicts with Preston and weakens privacy protections for cars held by police, arguing warrants should generally be required unless a search is incident to arrest.