Traffic stops for legal mistakes
Nicholas Brady Heien v. North Carolina
In brief
The Court let Heien’s stop stand because the officer’s mistake about traffic law was objectively reasonable.
- Where it stands
- Decided
Decided 8-1 · December 15, 2014 · Opinion by Justice Kagan
- What it’s about
- The Supreme Court agreed with North Carolina’s highest court that the stop of Nicholas Heien’s car was lawful: an officer’s objectively reasonable mistake about traffic law can provide the specific, reasonable basis (reasonable suspicion) needed for a traffic stop under the Fourth Amendment.
- Who it affects
- The ruling left Heien’s stop lawful because the officer’s mistake about traffic law was objectively reasonable.
Summary: written with AI from the case record.
What it's about
The Fourth Amendment requires police to have a specific, reasonable basis for stopping a vehicle.
Question presented
Does a police officer's mistake of law provide the individualized reasonable suspicion that the Fourth Amendment requires to justify a traffic stop?
What the Court decided
Holding
Because Darisse’s mistake of law was reasonable, there was reasonable suspicion justifying the stop under the Fourth Amendment. 367 N. C. 163, 749 S. E. 2d 278, affirmed.
- Result
- Affirmed
The Court's reasoning
The Court said an officer’s mistake about traffic law can provide a specific, reasonable basis for a stop only if the mistake is objectively reasonable. It applied that rule because Officer Darisse’s mistake met that standard.
The vote
From the opinions
“I would hold that determining whether a search or seizure is reasonable requires evaluating an officer’s understanding of the facts against the actual state of the law.”
What's next
The Supreme Court has finished its review, and North Carolina’s highest court’s judgment remains in place.
Documents
Opinions
Docket activity
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AI analysis generated: Impact Analysis
AI analysis generated: Opinion Summary
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AI analysis generated: Case Briefing
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AI analysis generated: Decision Record
Case data updated: summary, question_presented, generation_metadata
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Opinion added: Heien
More questions
- What did Justice Kagan emphasize?
- She said the officer’s personal understanding did not control; the mistake had to be objectively reasonable.
Sources
Primary materials plus reporting. Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.