 The majority held that a police officer's reasonable mistake of law can indeed provide the individualized suspicion required by the Fourth Amendment to justify a traffic stop based upon that understanding.In her concurring opinion, Kagan wrote that the full text of North Carolina's law "poses a quite difficult question of interpretation, and Sergeant Darisse’s judgment, although overturned, had much to recommend it".In her dissent, Sotomayor argued that the reasonableness of a search or seizure should instead be determined by evaluating "an officer's understanding of the facts against the actual state of the law."