Legal principles can be complicated, but in most courts, until eight months ago, there was a pretty simple one: Ignorance of the law is no excuse. Then came Heien v. North Carolina, decided by the U.S. Supreme Court in December. Now the principle is: Ignorance of the law is no excuse — unless you’re the cop enforcing the law, in which case it is, or at least can be, depending upon whether your ignorance is reasonable or not, to be determined upon later review.
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