On April 29, 2009, Sergeant Matt Darisse arrested Nicholas Heien in North Carolina after a traffic stop that Darisse initiated based on his misinterpretation of relevant state statutes. When Heien tried to exclude evidence that resulted from the traffic stop during his subsequent trial, the trial court denied his request. The North Carolina Court of Appeals reversed the trial court’s decision, holding that an officer cannot justify a traffic stop when a mistake of law serves as the primary justification for the stop. In December 2012, the North Carolina Supreme Court overturned the appellate court’s ruling. The Supreme Court of the United States will now consider whether a police officer’s mistake of law can serve as the requisite reasonable suspicion needed for a constitutional traffic stop. Heien argues that allowing police officers to base traffic stops on misinterpretations of the law would violate the Fourth Amendment rights of those stopped. North Carolina, however asserts that just as police officers can execute constitutional traffic stops by relying on reasonable mistakes of fact, a police officer can justify a stop if it is based on a reasonable but mistaken interpretation of a statute. The Court’s ruling implicates the Fourth Amendment practices of law enforcement, the right to privacy of individuals, and the right of individuals to be free from restraint.