Heien v. North Carolina
Headline: Ruling lets police stop drivers based on a reasonable misunderstanding of a traffic law, upholding a brake-light stop and allowing evidence found during that stop to be used.
Holding: Because the officer’s misunderstanding of the brake-light statute was objectively reasonable, a reasonable mistake of law can support the suspicion needed for a lawful traffic stop.
- Allows police to stop drivers based on reasonable legal misunderstandings about traffic laws.
- Requires courts to ask whether an officer's legal mistake was objectively reasonable.
- Limits drivers’ challenges to stops when officers’ legal views were reasonable and not clearly wrong.
Summary
Background
A state highway patrol sergeant stopped a car after seeing only the left brake light illuminate. Two men were in the vehicle: the driver and a passenger who was later charged with attempted cocaine trafficking after officers found drugs during a consent search. A state appeals court said the traffic law required only one working stop lamp, so the stop was unlawful; the state supreme court disagreed, finding the law ambiguous and the officer’s reading reasonable. The case reached the U.S. Supreme Court on that legal question.
Reasoning
The core question was whether a police officer’s reasonable mistake about what a law requires can supply the “reasonable suspicion” needed to stop someone. The Court answered yes. It explained that the Fourth Amendment’s reasonableness standard allows objectively reasonable mistakes of fact or law. The Court found the brake-light statute ambiguous and concluded the officer’s interpretation was objectively reasonable, so the stop was lawful. The opinion stressed limits: the mistake must be objectively reasonable, not based on the officer’s subjective misunderstanding, and mistakes about the Fourth Amendment itself cannot justify a seizure. A separate concurrence emphasized that the ambiguity must be genuine and the test is stricter than the one used for qualified immunity.
Real world impact
This decision lets police rely on reasonable legal readings of unclear traffic rules when stopping vehicles. Drivers may face more stops where statutes are ambiguous, but courts must decide whether an officer’s legal view was objectively reasonable. The Court said such cases should be rare because the law must pose a genuinely difficult interpretive question.
Dissents or concurrances
Justice Sotomayor dissented, arguing the reasonableness inquiry should apply the actual law to the facts and not an officer’s legal view; she warned the ruling expands police power and may delay clear legal guidance.
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