Submit a detailed case brief for Utah v. Strieff. SUPREME COURT OF THE UNITED STATESJun 20, 2016 136 S. Ct. 2056 (2016) 136 S. Ct. 2056 195 L. Ed. 2d 400 Justice THOMAS delivered the opinion of the Court.

To enforce the Fourth Amendment's prohibition against "unreasonable searches and seizures," this Court has at times required courts to exclude evidence. But the Court has also held in some cases, the link between the unconstitutional conduct and the discovery of the evidence is too attenuated to justify suppression. The question in this case is whether this attenuation doctrine applies when an officer makes an unconstitutional investigatory stop; learns during that stop that the suspect is subject to a valid arrest warrant; and proceeds to arrest the suspect and seize incriminating evidence during a search incident to that arrest. This case began with an anonymous tip. In December 2006, someone called the South Salt Lake City police's drug-tip line to report "narcotics activity" at a particular residence Narcotics detective Douglas Fackrell investigated the tip. Over the course of about a week, Officer Fackrell conducted intermittent surveillance of the home. He observed visitors who left a few minutes after arriving at the house. These visits were sufficiently frequent to raise his suspicion that the occupants were dealing drugs. One of those visitors was respondent Edward Strieff. Officer Fackrell observed Strieff exit the house and walk toward a nearby convenience store. In the store's parking lot, Officer Fackrell detained Strieff, identified himself, and asked Strieff what he was doing at the residence. As part of the stop, Officer Fackrell requested Strieff's identification, and Strieff produced his Utah identification card. Officer Fackrell relayed Strieff's information to a police dispatcher, who reported that Strieff had an outstanding arrest warrant for a traffic violation. Officer Fackrell then arrested Strieff pursuant to that warrant. When Officer Fackrell searched Strieff incident to the arrest, he discovered a baggie of methamphetamine and drug paraphernalia. The State charged Strieff with unlawful possession of methamphetamine and drug paraphernalia. Strieff moved to suppress the evidence, arguing that the evidence was inadmissible because it was derived from an unlawful investigatory stop. At the suppression hearing, the prosecutor conceded that Officer Fackrell lacked reasonable suspicion for the stop but argued that the evidence should not be suppressed because the existence of a valid arrest warrant attenuated the connection between the unlawful stop and the discovery of the contraband. The trial court agreed with the State and admitted the evidence. The court found that the short time between the illegal stop and the search weighed in favor of suppressing the evidence, but that two countervailing considerations made it admissible. First, the court considered the presence of a valid arrest warrant to be an " 'extraordinary intervening circumstance.' " Second, the court stressed the absence of flagrant misconduct by Officer Fackrell, who was conducting a legitimate investigation of a suspected drug house. Strieff conditionally pleaded guilty to reduced charges of attempted possession of a controlled substance and possession of drug paraphernalia, but reserved his right to appeal the trial court's denial of the suppression motion. The Utah Court of Appeals affirmed The Utah Supreme Court reversed. . It held that the evidence was inadmissible because only "a voluntary act of a defendant's free will (as in a confession or consent to search)" sufficiently breaks the connection between an illegal search and the discovery of evidence. Because Officer Fackrell's discovery of a valid arrest warrant did not fit this description, the court ordered the evidence suppressed. We granted certiorari. We now reverse. The Fourth Amendment protects "[t]he right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures." In the 20th century, the exclusionary rulethe rule that often requires trial courts to exclude unlawfully seized evidence in a criminal trialbecame the principal judicial remedy to deter Fourth Amendment violations. We have recognized several exceptions to the rule. Three of these exceptions involve the causal relationship between the unconstitutional act and the discovery of evidence. First, the independent source doctrine allows trial courts to admit evidence obtained in an unlawful search if officers independently acquired it from a separate, independent source. Second, the inevitable discovery doctrine allows for the admission of evidence that would have been discovered even without the unconstitutional source Third, and at issue here, is the attenuation doctrine: Evidence is admissible when the connection between unconstitutional police conduct and the evidence is remote or has been interrupted by some intervening circumstance, so that "the interest protected by the constitutional guarantee that has been violated would not be served by suppression of the evidence obtained. It remains for us to address whether the discovery of a valid arrest warrant was a sufficient intervening event to break the causal chain between the unlawful stop and the discovery of drug-related evidence on Strieff's person. First, we look to the "temporal proximity" between the unconstitutional conduct and the discovery of evidence to determine how closely the discovery of evidence followed the unconstitutional search Second, we consider "the presence of intervening circumstances." Third, and "particularly" significant, we examine "the purpose and flagrancy of the official misconduct." In evaluating these factors, we assume without deciding (because the State conceded the point) that Officer Fackrell lacked reasonable suspicion to initially stop Strieff. And, because we ultimately conclude that the warrant breaks the causal chain, we also have no need to decide whether the warrant's existence alone would make the initial stop constitutional even if Officer Fackrell was unaware of its existence. In this case, the warrant was valid, it predated Officer Fackrell's investigation, and it was entirely unconnected with the stop. And once Officer Fackrell discovered the warrant, he had an obligation to arrest Strieff. "A warrant is a judicial mandate to an officer to conduct a search or make an arrest, and the officer has a sworn duty to carry out its provisions." Officer Fackrell's arrest of Strieff thus was a ministerial act that was independently compelled by the pre-existing warrant. And once Officer Fackrell was authorized to arrest Strieff, it was undisputedly lawful to search Strieff as an incident of his arrest to protect Officer Fackrell's safety. Officer Fackrell was at most negligent. In stopping Strieff, Officer Fackrell made two good-faith mistakes. First, he had not observed what time Strieff entered the suspected drug house, so he did not know how long Strieff had been there. Officer Fackrell thus lacked a sufficient basis to conclude that Strieff was a short-term visitor who may have been consummating a drug transaction. Second, because he lacked confirmation that Strieff was a short-term visitor, Officer Fackrell should have asked Strieff whether he would speak with him, instead of demanding that Strieff do so. Officer Fackrell's stated purpose was to "find out what was going on [in] the house." Nothing prevented him from approaching Strieff simply to ask. ("[A] seizure does not occur simply because a police officer approaches an individual and asks a few questions"). But these errors in judgment hardly rise to a purposeful or flagrant violation of Strieff's Fourth Amendment rights. While Officer Fackrell's decision to initiate the stop was mistaken, his conduct thereafter was lawful. The officer's decision to run the warrant check was a "negligibly burdensome precautio[n]" for officer safety. And Officer Fackrell's actual search of Strieff was a lawful search incident to arrest. Applying these factors, we hold that the evidence discovered on Strieff's person was admissible because the unlawful stop was sufficiently attenuated by the pre-existing arrest warrant. Although the illegal stop was close in time to Strieff's arrest, that consideration is outweighed by two factors supporting the State. The outstanding arrest warrant for Strieff's arrest is a critical intervening circumstance that is wholly independent of the illegal stop. The discovery of that warrant broke the causal chain between the unconstitutional stop and the discovery of evidence by compelling Officer Fackrell to arrest Strieff. And, it is especially significant that there is no evidence that Officer Fackrell's illegal stop reflected flagrantly unlawful police misconduct. Further we find the defendant's arguments without merit. First, Strieff argues that the attenuation doctrine should not apply because the officer's stop was purposeful and flagrant. He asserts that Officer Fackrell stopped him solely to fish for evidence of suspected wrongdoing. But Officer Fackrell sought information from Strieff to find out what was happening inside a house whose occupants were legitimately suspected of dealing drugs. This was not a suspicionless fishing expedition "in the hope that something would turn up." Strieff argues, moreover, that Officer Fackrell's conduct was flagrant because he detained Strieff without the necessary reasonable suspicion to justify a detention. But that conflates the standard for an illegal stop with the standard for flagrancy. Neither the officer's alleged purpose nor the flagrancy of the violation rise to a level of misconduct to warrant suppression. Second, Strieff argues that, because of the prevalence of outstanding arrest warrants in many jurisdictions, police will engage in dragnet searches if the exclusionary rule is not applied. We think that this outcome is unlikely. Such wanton conduct would expose police to civil liability. We hold that the evidence Officer Fackrell seized as part of his search incident to arrest is admissible because his discovery of the arrest warrant attenuated the connection between the unlawful stop and the evidence seized from Strieff incident to arrest. The judgment of the Utah Supreme Court, accordingly, is reversed. It is so ordered.

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