Even Ignorant Cops Have to Follow the Law

The U.S. Supreme Court starts its term today, as the justices consider whether to admit evidence obtained at a traffic stop based on an erroneous but reasonable interpretation of the law.

Count the brake lights.

Photographer: Logan Mock-Bunting/Getty Images

You don’t need to go to law school to know that ignorance of the law is no excuse -- for you. But what about the cops? This morally significant question opens the U.S. Supreme Court term today, as the justices consider whether to admit evidence obtained after a traffic stop that was based on an erroneous but reasonable interpretation of the law.

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