"Ignorance of the law is no excuse.”If there is one law-related idea that even lay people are aware of, I would guess this is it.And that is why I was so surprised at the U.S. Supreme Court’s decision in Heien v. North Carolina four years ago. 135 S.Ct. 530 (2014).The case concerned an officer in a patrol car who noticed a vehicle with a broken right rear brake light. Believing this to be a violation of …