Chief Justice Roberts wrote that the court’s decision “does not discourage officers from learning the law,” because only objectively reasonable mistakes were permitted.
“An officer can gain no Fourth Amendment advantage,” the chief justice wrote, “through a sloppy study of the laws he is duty-bound to enforce.”
Justice Elena Kagan joined the majority opinion but added a concurrence, which was joined by Justice Ruth Bader Ginsburg. She emphasized that the state law in question “poses a quite difficult question of interpretation, and Sergeant Darisse’s judgment, although overturned, had much to recommend it.”
Justice Sonia Sotomayor dissented. She said the court’s ruling “means further eroding the Fourth Amendment’s protection of civil liberties in a context where that protection has already been worn down.”
The majority’s approach will also, she said, contribute to distrust between citizens and the police. If police officers are given leeway to interpret the law, she wrote, “one wonders how a citizen seeking to be law-abiding and to structure his or her behavior to avoid these invasive, frightening and humiliating encounters could do so.”
Chief Justice Roberts conceded that the court’s decision at first blush ran afoul of the maxim that “ignorance of the law is no excuse.”
On reflection, he said, the maxim holds the government and its citizens to the same standard where it counts.
“Just as an individual generally cannot escape criminal liability based on a mistaken understanding of the law,” Chief Justice Roberts wrote, “so too the government cannot impose criminal liability based on a mistaken understanding of the law.”...