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14 TCRP LRD 58 gave the officer reasonable suspicion to stop the car, the trial court denied Heienâs motion to suppress the evidence. After the trial courtâs ruling, Heien pleaded guilty but reserved the right to appeal the trial courtâs ruling on the suppression motion. The North Carolina Court of Appeals reversed the trial courtâs ruling, holding that under the North Carolina statute âdriving with only one working brake light was not actually a violation of North Carolina law.â135 Thus, â[t]he justification for the stop was . . . âobjectively unreasonable,â and the stop violated the Fourth Amendment.â136 The Supreme Court of North Carolina reversed the appeals court and remanded the case, because âSergeant Darisse could have reasonably, even if mistakenly, read the vehicle code to re- quire that both brake lights be in good working order.â137 âAn officer may make a mistake, including a mistake of law, yet still act reasonably under the circumstances. ... [W]hen an officer acts reasonably under the circumstances, he is not violating the Fourth Amendment.â138 In an opinion by Chief Justice Roberts, the Supreme Court affirmed the judgment of the Supreme Court of North Carolina. The Court held that, because âthe officerâs mistake about the brake-light law was reasonable, . . . the stop . . . was lawful under the Fourth Amendment.â139 An officerâs âreasonable sus- picion can rest on a mistaken understanding of the scope of a legal prohibition.â140 Justice Roberts wrote that, just as âsearches and seizures based on mistakes of fact can be reasonable,â so can searches and seizures based on mistakes of law be reason- able.141 Justice Roberts relied on precedents âdating back two centuries [that] support treating legal and factual errors alike in this context.â142 The Court held in Heien that âthe mistake of law relate[d] to the antecedent question of whether it was reasonable for an officer to suspect that the defendantâs conduct was illegal. If so, there was no violation of the Fourth Amendment in the first place.â143 â[B]ecause the mistake of law was reasonable, there was reasonable suspicion justifying the stop.â144 Although the Court in Heien âclearly expanded the leeway offered to police officers under the Fourth Amendment,â cases, of course, differ on what is meant by the term objectively reasonable.145 Finally, in light of the Courtâs decisions in Heien and in Taylor, supra, whether an officerâs mistake of fact or law is a constitutional violation that is redressable by § 1983 depends on 135 Heien, 574 U.S. at 58, 135 S. Ct. at 535, 190 L. Ed.2d at 481. 136 Id., 574 U.S. at 59, 135 S. Ct. at 535, 190 L. Ed.2d at 481 (citation omitted). 137 Id. 138 Id. (citation omitted). 139 Id. 574 U.S. at 57, 135 S. Ct. at 534, 190 L. Ed.2d at 480. 140 Id., 574 U.S. at 60, 135 S. Ct. at 536, 190 L. Ed.2d at 482. 141 Id., 574 U.S. at 61, 135 S. Ct. at 536, 190 L. Ed.2d at 482. 142 Id., 574 U.S. at 62, 135 S. Ct. at 536-537, 190 L. Ed.2d at 483. 143 Id., 574 U.S. at 66, 135 S. Ct. at 539, 190 L. Ed.2d at 485. 144 Id., 574 U.S. at 68, 135 S. Ct. at 540, 190 L. Ed.2d at 487. 145 Henning, supra note 127, at 326. IV. WHETHER A POLICE OFFICERâS MISTAKE OF FACT OR LAW IS A VIOLATION OF THE FOURTH AMENDMENT The Supreme Court has answered the question of whether a police officerâs search or seizure of a person based on the offi- cerâs reasonable mistake of fact or law is a violation of the Fourth Amendment. As one legal scholar concludes, the âCourt has recognized that police mistakes are inevitable and, to varying degrees, tolerated.â127 As noted in Section III, supra, a federal district court held in 2014 that â[q]ualified immunity shields an official even if her conduct resulted from âa mistake of law, a mistake of fact, or a mistake based on mixed questions of law and fact.ââ128 When an officer makes a mistake of fact, the Supreme Court has held that it is necessary to assess âthe reasonableness of the officerâs conduct in light of the information available to the of- ficerâ at the time of the search or seizure.129 Thus, âthe Fourth Amendment is not violated when information becomes avail- able after the fact that shows that the officer was mistaken about the facts.â130 âThe reasonableness of the officerâs conduct, viewed from an objective standard, permits the allowance of mistakes.â131 However, in several cases, the Court has held that a police officer complied with the Fourth Amendmentâs rea- sonableness requirement even when the officer wrongly under- stood what the facts were.132 As for a mistake of law, in 2014, in Heien v. North Carolina,133 the Supreme Court held that a police officer may make an âob- jectively reasonable mistake of substantive lawâ without violating the Fourth Amendment.134 In Heien, a traffic officer (Sergeant Darisse) had observed a motoristâs vehicle with an inoperative brake light. When the officer stopped the car, he became suspi- cious because of the driverâs and the passengerâs conduct and their inconsistent answers to his questions. The passenger in the car and its owner gave the officer, who was by then accompanied by another officer, permission to search the car. After the search uncovered a bag of cocaine, the officers arrested both men. The defendant Heien, who was charged with attempted traf- ficking of cocaine, moved to suppress the evidence on the basis that the arrest and search violated the Fourth Amendment. When Sergeant Darisse first observed the vehicle with an in- operative brake light, he erroneously concluded that the driver was violating North Carolina law. Because the faulty brake light 127 Karen McDonald Henning, âReasonableâ Police Mistakes: Fourth Amendment Claims and the âGood Faithâ Exception after Heien, 90 St. Johnâs L. Rev. 271, 272 (2016) [hereinafter Henning]. 128 Brietkopf, 41 F. Supp.3d at 243-244 (citations omitted) (emphasis supplied). 129 Henning, supra note 127, at 276 (footnote omitted). 130 Id. (footnote omitted). 131 Id. at 277. 132 Id. 133 574 U.S. 54, 135 S. Ct. 530, 190 L. Ed.2d 475 (2014). 134 Henning, supra note 127, at 272 (footnote deleted) (emphasis supplied).