opinion: FLORIDA v. HARRIS
  No. 11-817.
  Argued October 31, 2012
  Decided February 19, 2013
  Kagan, J., delivered the opinion for a unanimous Court.
  Gregory G. Garre argued the cause for petitioner. With him on the briefs were Pamela Jo Bondi, Attorney General of Florida, Carolyn M. Snurkowski, Associate Deputy Attorney General, Robert J. Krauss, Chief-Assistant Attorney General, and Susan M. Shanahan, Assistant Attorney General.
  Joseph R. Palmore argued the cause for the United States as amicus curiae in support of petitioner. With him on the brief were Solicitor General Verrilli, Assistant Attorney General Breuer, and Deputy Solicitor General Dreeben.
  Glen P. Gifford argued the cause and filed a brief for respondent.
  Briefs of amici curiae urging reversal were filed for the Commonwealth of Virginia et al. by Kenneth T Cuccinelli II, Attorney General of Virginia, E. Duncan Getchell, Jr., Solicitor General, Charles E. James, Jr., Chief Deputy Attorney General, Wesley G. Russell, Jr., Deputy Attorney General, and Michael H. Brady, Assistant Attorney General, and by officials for their respective jurisdictions as follows: Luther Strange, Attorney General of Alabama, Tom Horne, Attorney General of Arizona, John W. Suthers, Attorney General of Colorado, Joseph R. Biden III, Attorney General of Delaware, Leonardo M. Rapadas, Attorney General of Guam, Lawrence G. Wasden, Attorney General of Idaho, Lisa Madigan, Attorney General of Illinois, Gregory F. Zoeller, Attorney General of Indiana, Derek Schmidt, Attorney General of Kansas, and John Campbell, Chief Deputy Attorney General, William J. Schneider, Attorney General of Maine, Bill Schuette, Attorney General of Michigan, Chris Koster, Attorney General of Missouri, Jon Bruning, Attorney General of Nebraska, Jeffrey S. Chiesa, Attorney General of New Jersey, Gary K. King, Attorney General of New Mexico, Wayne Stenehjem, Attorney General of North Dakota, E. Scott Pruitt, Attorney General of Oklahoma, John R. Kroger, Attorney General of Oregon, Linda L. Kelly, Attorney General of Pennsylvania, Guillermo Somoza-Colombani, Attorney General of Puerto Rico, and Luis R. Román Negrón, Solicitor General, Greg Abbott, Attorney General of Texas, Mark L. Shurtleff, Attorney General of Utah, William H. Sorrell, Attorney General of Vermont, Robert M. McKenna, Attorney General of Washington, J. B. Van Hollen, Attorney General of Wisconsin, and Gregory A. Phillips, Attorney General of Wyoming; and for the National Police Canine Association et al. by Arthur T. Daus III.
  Briefs of amici curiae urging affirmance were filed for the Electronic Privacy Information Center by Marc Rotenberg; for the Institute for Justice by William H. Mellor, Scott G. Bullock, Darpana M. Sheth, and Robert P. Frommer, for the National Association of Criminal Defense Lawyers et al. by Danielle Spinelli, Annie L. Owens, Jonathan D. Hacker, Mason C. Clutter, Steven R. Shapiro, Ezekiel R. Edwards, Michael Uffer-man, Sonya Rudenstine, Randall C. Marshall, and Maria Kayanan; for The Rutherford Institute by Anand Agneshwar, Lisa S. Blatt, Carl Nadler, John W. Whitehead, Rita M. Dunaway, and Charles I. Lugosi; and for Fourth Amendment Scholars by Leslie A. Shoebotham.
  Justice Kagan
  delivered the opinion of the Court.
  In this ease, we consider how a court should determine if the “alert” of a drug-detection dog during a traffic stop provides probable cause to search a vehicle. The Florida Supreme Court held that the State must in every case present an exhaustive set of records, including a log of the dog’s performance in the field, to establish the dog’s reliability. See 71 So. 3d 756, 775 (2011). We think that demand inconsistent with the “flexible, common-sense standard” of probable cause. Illinois v. Gates, 462 U. S. 213, 239 (1983).
  HH
  William Wheetley is a K-9 Officer in the Liberty County, Florida Sheriff’s Office. On June 24, 2006, he was on a routine patrol with Aldo, a German shepherd trained to detect certain narcotics (methamphetamine, marijuana, cocaine, heroin, and ecstasy). Wheetley pulled over respondent Clayton Harris’s truck because it had an expired license plate. On approaching the driver’s-side door, Wheetley saw that Harris was “visibly nervous,” unable to sit still, shaking, and breathing rapidly. App. 62. Wheetley also noticed an open can of beer in the truck’s cup holder. Ibid. Wheetley asked Harris for consent to search the truck, but Harris refused. At that point, Wheetley retrieved Aldo from the patrol car and walked him around Harris’s truck for a “free air sniff.” Id., at 63. Aldo alerted at the driver’s-side door handle—signaling, through a distinctive set of behaviors, that he smelled drugs there.
  Wheetley concluded, based principally on Aldo’s alert, that he had probable cause to search the truck. His search did not turn up any of the drugs Aldo was trained to detect. But it did reveal 200 loose pseudoephedrine pills, 8,000 matches, a bottle of hydrochloric acid, two containers of antifreeze, and a coffee filter full of iodine crystals—all ingredients for making methamphetamine. Wheetley accordingly arrested Harris, who admitted after proper Miranda warnings that he routinely “cooked” methamphetamine at his house and could not go “more than a few days without using” it. Id., at 68. The State charged Harris with possessing pseudoephedrine for use in manufacturing methamphetamine.
  While out on bail, Harris had another run-in with Wheet-ley and Aldo. This time, Wheetley pulled Harris over for a broken brake light. Aldo again sniffed the truck’s exterior, and again alerted at the driver’s-side door handle. Wheet-ley once more searched the truck, but on this occasion discovered nothing of interest.
  Harris moved to suppress the evidence found in his truck on the ground that Aldo’s alert had not given Wheetley probable cause for a search. At the hearing on that motion, Wheetley testified about both his and Aldo’s training in drug detection. See id., at 52-82. In 2004, Wheetley (and a different dog) completed a 160-hour course in narcotics detection offered by the Dothan, Alabama Police Department, while Aldo (and a different handler) completed a similar, 120-hour course given by the Apopka, Florida Police Department. That same year, Aldo received a one-year certification from Drug Beat, a private company that specializes in testing and certifying K-9 dogs. Wheetley and Aldo teamed up in 2005 and went through another, 40-hour refresher course in Dothan together. They also did four hours of training exercises each week to maintain their skills. Wheetley would hide drugs in certain vehicles or buildings while leaving others “blank” to determine whether Aldo alerted at the right places. Id., at 57. According to Wheet-ley, Aldo’s performance in those exercises was “really good.” Id., at 60. The State introduced “Monthly Canine Detection Training Logs” consistent with that testimony: They showed that Aldo always found hidden drugs and that he performed “satisfactorily” (the higher of two possible assessments) on each day of training. Id., at 109-116.
  On cross-examination, Harris’s attorney chose not to contest the quality of Aldo’s or Wheetley’s training. She focused instead on Aldo’s certification and his performance in the field, particularly the two stops of Harris’s truck. Wheetley conceded that the certification (which, he noted, Florida law did not require) had expired the year before he pulled Harris over. See id., at 70-71. Wheetley also acknowledged that he did not keep complete records of Aldo’s performance in traffic stops or other field work; instead, he maintained records only of alerts resulting in arrests. See id., at 71-72, 74. But Wheetley defended Aldo’s two alerts to Harris’s seemingly narcotics-free truck: According to Wheetley, Harris probably transferred the odor of methamphetamine to the door handle, and Aldo responded to that “residual odor.” Id., at 80.
  The trial court concluded that Wheetley had probable cause to search Harris’s truck and so denied the motion to suppress. Harris then entered a no-contest plea while reserving the right to appeal the trial court’s ruling. An intermediate state court summarily affirmed. 989 So. 2d 1214, 1215 (Fla. App. 2008) (per curiam,).
  The Florida Supreme Court reversed, holding that Wheet-ley lacked probable cause to search Harris’s vehicle under the Fourth Amendment. “[W]hen a dog alerts,” the court wrote, “the fact that the dog has been trained and certified is simply not enough to establish probable cause.” 71 So. 3d, at 767. To demonstrate a dog’s reliability, the State needed to produce a wider array of evidence:
  “[T]he State must present . . . the dog’s training and certification records, an explanation of the meaning of the particular training and certification, field perform-nance records (including any unverified alerts), and evi-denee concerning the experience and training of the officer handling the dog, as well as any other objective evidence known to the officer about the dog’s reliability.” Id., at 775.
  The court particularly stressed the need for “evidence of the dog’s performance history,” including records showing “how often the dog has alerted in the field without illegal contraband having been found.” Id., at 769. That data, the court stated, could help to expose such problems as a handler’s tendency (conscious or not) to “cue [a] dog to alert” and “a dog’s inability to distinguish between residual odors and actual drugs.” Id., at 769, 774. Accordingly, an officer like Wheetley who did not keep full records of his dog’s field performance could never have the requisite cause to think “that the dog is a reliable indicator of drugs.” Id., at 773.
  Chief Justice Canady dissented, maintaining that the majority’s “elaborate and inflexible evidentiary requirements” went beyond the demands of probable cause. Id., at 775. He would have affirmed the trial court’s ruling on the strength of Aldo’s training history and Harris’s “fail[ure] to present any evidence challenging” it. Id., at 776.
  We granted certiorari, 566 U. S. 904 (2012), and now reverse.
  II
  A police officer has probable cause to conduct a search when “the facts available to [him] would ‘warrant a [person] of reasonable caution in the belief’ ” that contraband or evidence of a crime is present. Texas v. Brown, 460 U. S. 730, 742 (1983) (plurality opinion) (quoting Carroll v. United States, 267 U. S. 132, 162 (1925)); see Safford Unified School Dist. #1 v. Redding, 557 U. S. 364, 370-371 (2009). The test for probable cause is not reducible to “precise definition or quantification.” Maryland v. Pringle, 540 U. S. 366, 371 (2003). “Finely tuned standards such as proof beyond a reasonable doubt or by a preponderance of the evidence . . . have no place in the [probable-cause] decision.” Gates, 462 U. S., at 235. All we have required is the kind of “fair probability” on which “reasonable and prudent [people,] not legal technicians, act.” Id., at 238, 231 (internal quotation marks omitted).
  In evaluating whether the State has met this practical and common-sensical standard, we have consistently looked to the totality of the circumstances. See, e. g., Pringle, 540 U. S., at 371; Gates, 462 U. S., at 232; Brinegar v. United States, 338 U. S. 160, 176 (1949). We have rejected rigid rules, bright-line tests, and mechanistic inquiries in favor of a more flexible, all-things-considered approach. In Gates, for example, we abandoned our old test for assessing the reliability of informants’ tips because it had devolved into a “complex superstructure of evidentiary and analytical rules,” any one of which, if not complied with, would derail a finding of probable cause. 462 U. S., at 235. We lamented the development of a list of “inflexible, independent requirements applicable in every case.” Id., at 230, n. 6. Probable cause, we emphasized, is “a fluid concept—turning on the assessment of probabilities in particular factual contexts—not readily, or even usefully, reduced to a neat set of legal rules.” Id., at 232.
  The Florida Supreme Court flouted this established approach to determining probable cause. To assess the reliability of a drug-detection dog, the court created a strict evidentiary checklist, whose every item the State must tick off. Most prominently, an alert cannot establish probable cause under the Florida court’s decision unless the State introduces comprehensive documentation of the dog’s prior “hits” and “misses” in the field. (One wonders how the court would apply its test to a rookie dog.) No matter how much other proof the State offers of the dog’s reliability, the absent field performance records will preclude a finding of probable cause. That is the antithesis of a totality-of-the-circumstances analysis. It is, indeed, the very thing we criticized in Gates when we overhauled our method for assessing the trustworthiness of an informant’s tip. A gap as to any one matter, we explained, should not sink the State’s case; rather, that “deficiency ... may be compensated for, in determining the overall reliability of a tip, by a strong showing as to . . . other indicia of reliability.” Id., at 233. So too here, a finding of a drug-detection dog’s reliability cannot depend on the State’s satisfaction of multiple, independent evidentiary requirements. No more for dogs than for human informants is such an inflexible checklist the way to prove reliability, and thus establish probable cause.
  Making matters worse, the decision below treats records of a dog’s field performance as the gold standard in evidence, when in most cases they have relatively limited import. Errors may abound in such records. If a dog on patrol fails to alert to a car containing drugs, the mistake usually will go undetected because the officer will not initiate a search. Field data thus may not capture a dog’s false negatives. Conversely (and more relevant here), if the dog alerts to a car in which the officer finds no narcotics, the dog may not have made a mistake at all. The dog may have detected substances that were too well hidden or present in quantities too small for the officer to locate. Or the dog may have smelled the residual odor of drugs previously in the vehicle or on the driver’s person. Field data thus may markedly overstate a dog’s real false positives. By contrast, those inaccuracies—in either direction—do not taint records of a dog’s performance in standard training and certification settings. There, the designers of an assessment know where drugs are hidden and where they are not—and so where a dog should alert and where he should not. The better measure of a dog’s reliability thus comes away from the field, in controlled testing environments.
  For that reason, evidence of a dog’s satisfactory performance in a certification or training program can itself provide sufficient reason to trust his alert. If a bona fide organization has certified a dog after testing his reliability in a controlled setting, a court can presume (subject to any conflicting evidence offered) that the dog’s alert provides probable cause to search. The same is true, even in the absence of formal certification, if the dog has recently and successfully completed a training program that evaluated his proficiency in locating drugs. After all, law enforcement units have their own strong incentive to use effective training and certification programs, because only accurate drug-detection dogs enable officers to locate contraband without incurring unnecessary risks or wasting limited time and resources.
  A defendant, however, must have an opportunity to challenge such evidence of a dog’s reliability, whether by cross-examining the testifying officer or by introducing his own fact or expert witnesses. The defendant, for example, may contest the adequacy of a certification or training program, perhaps asserting that its standards are too lax or its methods faulty. So too, the defendant may examine how the dog (or handler) performed in the assessments made in those settings. Indeed, evidence of the dog’s (or handler’s) history in the field, although susceptible to the kind of misinterpretation we have discussed, may sometimes be relevant, as the Solicitor General acknowledged at oral argument. See Tr. of Oral Arg. 23-24 (“[T]he defendant can ask the handler, if the handler is on the stand, about field performance, and then the court can give that answer whatever weight is appropriate”). And even assuming a dog is generally reliable, circumstances surrounding a particular alert may undermine the case for probable cause—if, say, the officer cued the dog (consciously or not), or if the team was working under unfamiliar conditions.
  In short, a probable-cause hearing focusing on a dog’s alert should proceed much like any other. The court should allow the parties to make their best case, consistent with the usual rules of criminal procedure. And the court should then evaluate the proffered evidence to decide what all the circumstances demonstrate. If the State has produced proof from controlled settings that a dog performs reliably in detecting drugs, and the defendant has not contested that showing, then the court should find probable cause. If, in contrast, the defendant has challenged the State’s case (by disputing the reliability of the dog overall or of a particular alert), then the court should weigh the competing evidence. In all events, the court should not prescribe, as the Florida Supreme Court did, an inflexible set of evidentiary requirements. The question—similar to every inquiry into probable cause—is whether all the facts surrounding a dog’s alert, viewed through the lens of common sense, would make a reasonably prudent person think that a search would reveal contraband or evidence of a crime. A sniff is up to snuff when it meets that test.
  Ill
  And here, Aldo’s did. The record in this case amply supported the trial court’s determination that Aldo’s alert gave Wheetley probable cause to search Harris’s truck.
  The State, as earlier described, introduced substantial evidence of Aldo’s training and his proficiency in finding drugs. See supra, at 241-242. The State showed that two years before alerting to Harris’s truck, Aldo had successfully completed a 120-hour program in narcotics detection, and separately obtained a certification from an independent company. And although the certification expired after a year, the Sheriff’s Office required continuing training for Aldo and Wheet-ley. The two satisfied the requirements of another, 40-hour training program one year prior to the search at issue. And Wheetley worked with Aldo for four hours each week on exercises designed to keep their skills sharp. Wheetley testified, and written records confirmed, that in those settings Aldo always performed at the highest level.
  Harris, as also noted above, declined to challenge in the trial court any aspect of Aldo’s training. See supra, at 242. To be sure, Harris’s briefs in this Court raise questions about that training’s adequacy—for example, whether the programs simulated sufficiently diverse environments and whether they used enough blind testing (in which the handler does not know the location of drugs and so cannot cue the dog). See Brief for Respondent 57-58. Similarly, Harris here queries just how well Aldo performed in controlled testing. See id., at 58. But Harris never voiced those doubts in the trial court, and cannot do so for the first time here. See, e. g., Rugendorf v. United States, 376 U. S. 528, 534 (1964). As the case came to the trial court, Aldo had successfully completed two recent drug-detection courses and maintained his proficiency through weekly training exercises. Viewed alone, that training record—with or without the prior certification—sufficed to establish Aldo’s reliability. See supra, at 246-248.
  And Harris’s cross-examination of Wheetley, which focused on Aldo’s field performance, failed to rebut the State’s case. Harris principally contended in the trial court that because Wheetley did not find any of the substances Aldo was trained to detect, Aldo’s two alerts must have been falseé See Brief for Respondent 1; App. 77-80. But we have already described the hazards of inferring too much from the failure of a dog’s alert to lead to drugs, see supra, at 245-246; and here we doubt that Harris’s logic does justice to Aldo’s skills. Harris cooked and used methamphetamine on a regular basis; so as Wheetley later surmised, Aldo likely responded to odors that Harris had transferred to the driver’s-side door handle of his truck. See supra, at 242. A well-trained drug-detection dog should alert to such odors; his response to them might appear a mistake, but in fact is not. See n. 2, supra. And still more fundamentally, we do not evaluate probable cause in hindsight, based on what a search does or does not turn up. See United States v. Di Re, 332 U. S. 581, 595 (1948). For the reasons already stated, Wheetley had good cause to view Aldo as a reliable detector of drugs. And no special circumstance here gave Wheetley reason to discount Aldo’s usual dependability or distrust his response to Harris’s truck.
  Because training records established Aldo’s reliability in detecting drugs and Harris failed to undermine that showing, we agree with the trial court that Wheetley had probable cause to search Harris’s truck. We accordingly reverse the judgment of the Florida Supreme Court.
  It is so ordered.
  By the time of oral argument in this case, even Harris declined to defend the idea that the Fourth Amendment compels the State to produce each item of evidence the Florida Supreme Court enumerated. See Tr. of Oral Arg. 29-30 (“I don’t believe the Constitution requires [that list]”). Harris instead argued that the court’s decision, although “looking] rather didactic,” in fact did not impose any such requirement. Id., at 29; see id., at 31 (“[I]t’s not a specific recipe that can’t be deviated from”). But in reading the decision below as establishing a mandatory checklist, we do no more than take the court at its (oft-repeated) word. See, e. g., 71 So. 3d 756, 758, 759, 771, 775 (Fla. 2011) (holding that the State “must” present the itemized evidence).
  See U. S. Dept. of Army, Military Working Dog Program 30 (Pamphlet 190-12,1993) (“The odor of a substance may be present in enough concentration to cause the dog to respond even after the substance has been removed. Therefore, when a detector dog responds and no drug or explosive is found, do not assume the dog has made an error”); S. Bryson, Police Dog Tactics 257 (2d ed. 2000) (“Four skiers toke up in the parking lot before going up the mountain. Five minutes later a narcotic detector dog alerts to the car. There is no dope inside. However, the dog has performed correctly”). The Florida Supreme Court treated a dog’s response to residual odor as an error, referring to the “inability to distinguish between [such] odors and actual drugs” as a “facto[r] that call[s] into question Aldo’s reliability.” 71 So. 3d, at 773-774; see supra, at 243. But that statement reflects a misunderstanding. A detection dog recognizes an odor, not a drug, and should alert whenever the scent is present, even if the substance is gone (just as a police officer’s much inferior nose detects the odor of marijuana for some time after a joint has been smoked). In the usual case, the mere chance that the substance might no longer be at the location does not matter; a well-trained dog’s alert establishes a fan-probability—all that is required for probable cause—that either drugs or evidence of a drug crime (like the precursor chemicals in Harris’s truck) will be found.
  See K. Furton, J. Greb, & H. Holness, Florida Int’l Univ., The Scientific Working Group on Dog and Orthogonal Detector Guidelines 1, 61-62, 66 (2010) (recommending as a “best practice” that a dog’s reliability should be assessed based on “the results of certification and proficiency assessments,” because in those “procedure^] you should know whether you have a false positive,” unlike in “most operational situations”).
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