Source: https://supreme.justia.com/cases/federal/us/533/27/
Timestamp: 2019-04-23 13:59:44+00:00

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Suspicious that marijuana was being grown in petitioner Kyllo's home in a triplex, agents used a thermal-imaging device to scan the triplex to determine if the amount of heat emanating from it was consistent with the high-intensity lamps typically used for indoor marijuana growth. The scan showed that Kyllo's garage roof and a side wall were relatively hot compared to the rest of his home and substantially warmer than the neighboring units. Based in part on the thermal imaging, a Federal Magistrate Judge issued a warrant to search Kyllo's home, where the agents found marijuana growing. Mter Kyllo was indicted on a federal drug charge, he unsuccessfully moved to suppress the evidence seized from his home and then entered a conditional guilty plea. The Ninth Circuit ultimately affirmed, upholding the thermal imaging on the ground that Kyllo had shown no subjective expectation of privacy because he had made no attempt to conceal the heat escaping from his home. Even if he had, ruled the court, there was no objectively reasonable expectation of privacy because the thermal imager did not expose any intimate details of Kyllo's life, only amorphous hot spots on his home's exterior.
expectation of privacy in the searched object, and society is willing to recognize that expectation as reasonable, see, e. g., California v. Ciraolo, supra, at 211. Pp. 31-33.
(b) While it may be difficult to refine the Katz test in some instances, in the case of the search of a home's interior-the prototypical and hence most commonly litigated area of protected privacy-there is a ready criterion, with roots deep in the common law, of the minimal expectation of privacy that exists, and that is acknowledged to be reasonable. To withdraw protection of this minimum expectation would be to permit police technology to erode the privacy guaranteed by the Fourth Amendment. Thus, obtaining by sense-enhancing technology any information regarding the home's interior that could not otherwise have been obtained without physical "intrusion into a constitutionally protected area," Silverman v. United States, 365 U. S. 505, 512, constitutes a search-at least where (as here) the technology in question is not in general public use. This assures preservation of that degree of privacy against government that existed when the Fourth Amendment was adopted. Pp. 33-35.
(c) Based on this criterion, the information obtained by the thermal imager in this case was the product of a search. The Court rejects the Government's argument that the thermal imaging must be upheld because it detected only heat radiating from the home's external surface. Such a mechanical interpretation of the Fourth Amendment was rejected in Katz, where the eavesdropping device in question picked up only sound waves that reached the exterior of the phone booth to which it was attached. Reversing that approach would leave the homeowner at the mercy of advancing technology-including imaging technology that could discern all human activity in the home. Also rejected is the Government's contention that the thermal imaging was constitutional because it did not detect "intimate details." Such an approach would be wrong in principle because, in the sanctity of the home, all details are intimate details. See, e. g., United States v. Karo, 468 U. S. 705; Dow Chemical, supra, at 238, distinguished. It would also be impractical in application, failing to provide a workable accommodation between law enforcement needs and Fourth Amendment interests. See Oliver v. United States, 466 U. S. 170, 181. Pp. 35-40.
(d) Since the imaging in this case was an unlawful search, it will remain for the District Court to determine whether, without the evidence it provided, the search warrant was supported by probable cause-and if not, whether there is any other basis for supporting admission of that evidence. P. 40.
SCALIA, J., delivered the opinion of the Court, in which SOUTER, THOMAS, GINSBURG, and BREYER, JJ., joined. STEVENS, J., filed a dissenting opinion, in which REHNQUIST, C. J., and O'CONNOR and KENNEDY, JJ., joined, post, p. 41.
Kenneth Lerner, by appointment of the Court, 531 U. S. 955, argued the cause and filed briefs for petitioner.
*Briefs of amici curiae urging reversal were filed for the Liberty Project by Julie M. Carpenter; and for the National Association of Criminal Defense Lawyers et al. by James J. Tomkovicz, Lisa B. Kemler, and Steven R. Shapiro.
is cool, white is hot, shades of gray connote relative differences; in that respect, it operates somewhat like a video camera showing heat images. The scan of Kyllo's home took only a few minutes and was performed from the passenger seat of Agent Elliott's vehicle across the street from the front of the house and also from the street in back of the house. The scan showed that the roof over the garage and a side wall of petitioner's home were relatively hot compared to the rest of the home and substantially warmer than neighboring homes in the triplex. Agent Elliott concluded that petitioner was using halide lights to grow marijuana in his house, which indeed he was. Based on tips from informants, utility bills, and the thermal imaging, a Federal Magistrate Judge issued a warrant authorizing a search of petitioner's home, and the agents found an indoor growing operation involving more than 100 plants. Petitioner was indicted on one count of manufacturing marijuana, in violation of 21 U. s. C. § 841(a)(1). He unsuccessfully moved to suppress the evidence seized from his home and then entered a conditional guilty plea.
opinion was withdrawn and the panel (after a change in composition) affirmed, 190 F.3d 1041 (1999), with Judge Noonan dissenting. The court held that petitioner had shown no subjective expectation of privacy because he had made no attempt to conceal the heat escaping from his home, id., at 1046, and even if he had, there was no objectively reasonable expectation of privacy because the imager "did not expose any intimate details of Kyllo's life," only "amorphous 'hot spots' on the roof and exterior wall," id., at 1047. We granted certiorari. 530 U. S. 1305 (2000).
eye cannot by the laws of England be guilty of a trespass.'" Boyd v. United States, 116 U. S. 616, 628 (1886) (quoting Entick v. Carrington, 19 How. St. Tr. 1029, 95 Eng. Rep. 807 (K. B. 1765)). We have since decoupled violation of a person's Fourth Amendment rights from trespassory violation of his property, see Rakas v. III inois, 439 U. S. 128, 143 (1978), but the lawfulness of warrantless visual surveillance of a home has still been preserved. As we observed in California v. Ciraolo, 476 U. S. 207, 213 (1986), "[t]he Fourth Amendment protection of the home has never been extended to require law enforcement officers to shield their eyes when passing by a home on public thoroughfares."
1 When the Fourth Amendment was adopted, as now, to "search" meant "[tJo look over or through for the purpose of finding something; to explore; to examine by inspection; as, to search the house for a book; to search the wood for a thief." N. Webster, An American Dictionary of the English Language 66 (1828) (reprint 6th ed. 1989).
Fourth Amendment nonetheless protected Katz from the warrantless eavesdropping because he "justifiably relied" upon the privacy of the telephone booth. Id., at 353. As Justice Harlan's oft-quoted concurrence described it, a Fourth Amendment search occurs when the government violates a subjective expectation of privacy that society recognizes as reasonable. See id., at 361. We have subsequently applied this principle to hold that a Fourth Amendment search does not occur-even when the explicitly protected location of a house is concerned-unless "the individual manifested a subjective expectation of privacy in the object of the challenged search," and "society [is] willing to recognize that expectation as reasonable." Ciraolo, supra, at 211. We have applied this test in holding that it is not a search for the police to use a pen register at the phone company to determine what numbers were dialed in a private home, Smith v. Maryland, 442 U. S. 735, 743744 (1979), and we have applied the test on two different occasions in holding that aerial surveillance of private homes and surrounding areas does not constitute a search, Ciraolo, supra; Florida v. Riley, 488 U. S. 445 (1989).
entirely unaffected by the advance of technology. For example, as the cases discussed above make clear, the technology enabling human flight has exposed to public view (and hence, we have said, to official observation) uncovered portions of the house and its curtilage that once were private. See Ciraolo, supra, at 215. The question we confront today is what limits there are upon this power of technology to shrink the realm of guaranteed privacy.
2 The dissent's repeated assertion that the thermal imaging did not obtain information regarding the interior of the home, post, at 43, 44 (opinion of STEVENS, J.), is simply inaccurate. A thermal imager reveals the relative heat of various rooms in the home. The dissent may not find that information particularly private or important, see post, at 43-44, 45, 4950, but there is no basis for saying it is not information regarding the interior of the home. The dissent's comparison of the thermal imaging to various circumstances in which outside observers might be able to perceive, without technology, the heat of the home-for example, by observing snowmelt on the roof, post, at 43-is quite irrelevant. The fact that equivalent information could sometimes be obtained by other means does not make lawful the use of means that violate the Fourth Amendment. The police might, for example, learn how many people are in a particular house by setting up year-round surveillance; but that does not make breaking and entering to find out the same information lawful. In any event, on the night of January 16, 1992, no outside observer could have discerned the relative heat of Kyllo's home without thermal imaging.
3 The ability to "see" through walls and other opaque barriers is a clear, and scientifically feasible, goal of law enforcement research and development. The National Law Enforcement and Corrections Technology Center, a program within the United States Department of Justice, features on its Internet Website projects that include a "RadarBased Through-the-Wall Surveillance System," "Handheld Ultrasound Through the Wall Surveillance," and a "Radar Flashlight" that "will enable law enforcement officers to detect individuals through interior building walls." www.nlectc.org/techproj/ (visited May 3, 2001). Some devices may emit low levels of radiation that travel "through-the-wall," but others, such as more sophisticated thermal-imaging devices, are entirely passive, or "off-the-wall" as the dissent puts it.
4 The dissent asserts, post, at 44-45, n. 3, that we have misunderstood its point, which is not that inference insulates a search, but that inference alone is not a search. If we misunderstood the point, it was only in a good-faith effort to render the point germane to the case at hand. The issue in this case is not the police's allegedly unlawful inferencing, but their allegedly unlawful thermal-imaging measurement of the emanations from a house. We say such measurement is a search; the dissent says it is not, because an inference is not a search. We took that to mean that, since the technologically enhanced emanations had to be the basis of inferences before anything inside the house could be known, the use of the emanations could not be a search. But the dissent certainly knows better than we what it intends. And if it means only that an inference is not a search, we certainly agree. That has no bearing, however, upon whether hi-tech measurement of emanations from a house is a search.
5The Government cites our statement in California v. Ciraolo, 476 U. S. 207 (1986), noting apparent agreement with the State of California that aerial surveillance of a house's curtilage could become "'invasive'" if "'modern technology'" revealed "'those intimate associations, objects or activities otherwise imperceptible to police or fellow citizens.'" Id., at 215, n. 3 (quoting Brief for State of California 14-15). We think the Court's focus in this secondhand dictum was not upon intimacy but upon otherwise-imperceptibility, which is precisely the principle we vindicate today.
home activities are "intimate" and which are not. And even when (if ever) that jurisprudence were fully developed, no police officer would be able to know in advance whether his through-the-wall surveillance picks up "intimate" detailsand thus would be unable to know in advance whether it is constitutional.
We have said that the Fourth Amendment draws "a firm line at the entrance to the house," Payton, 445 U. S., at 590. That line, we think, must be not only firm but also brightwhich requires clear specification of those methods of surveillance that require a warrant. While it is certainly possible to conclude from the videotape of the thermal imaging that occurred in this case that no "significant" compromise of the homeowner's privacy has occurred, we must take the long view, from the original meaning of the Fourth Amendment forward.
however, is not with us but with this Court's precedent. See Ciraolo, supra, at 215 ("In an age where private and commercial flight in the public airways is routine, it is unreasonable for respondent to expect that his marijuana plants were constitutionally protected from being observed with the naked eye from an altitude of 1,000 feet"). Given that we can quite confidently say that thermal imaging is not "routine," we decline in this case to reexamine that factor.
JUSTICE STEVENS, with whom THE CHIEF JUSTICE, JusTICE O'CONNOR, and JUSTICE KENNEDY join, dissenting.
There is, in my judgment, a distinction of constitutional magnitude between "through-the-wall surveillance" that gives the observer or listener direct access to information in a private area, on the one hand, and the thought processes used to draw inferences from information in the public domain, on the other hand. The Court has crafted a rule that purports to deal with direct observations of the inside of the home, but the case before us merely involves indirect deductions from "off-the-wall" surveillance, that is, observations of the exterior of the home. Those observations were made with a fairly primitive thermal imager that gathered data exposed on the outside of petitioner's home but did not invade any constitutionally protected interest in privacy.l Moreover, I believe that the supposedly "bright-line" rule the Court has created in response to its concerns about future technological developments is unnecessary, unwise, and inconsistent with the Fourth Amendment.
our Fourth Amendment jurisprudence. One of those core principles, of course, is that "searches and seizures inside a home without a warrant are presumptively unreasonable." Payton v. New York, 445 U. S. 573, 586 (1980) (emphasis added). But it is equally well settled that searches and seizures of property in plain view are presumptively reasonable. See id., at 586-587.2 Whether that property is residential or commercial, the basic principle is the same: "'What a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection.'" California v. Ciraolo, 476 U. S. 207, 213 (1986) (quoting Katz v. United States, 389 U. S. 347, 351 (1967)); see Florida v. Riley, 488 U. S. 445, 449-450 (1989); California v. Greenwood, 486 U. S. 35, 40-41 (1988); Dow Chemical Co. v. United States, 476 U. S. 227, 235-236 (1986); Air Pollution Variance Bd. of Colo. v. Western Alfalfa Corp., 416 U. S. 861, 865 (1974). That is the principle implicated here.
2 Thus, for example, we have found consistent with the Fourth Amendment, even absent a warrant, the search and seizure of garbage left for collection outside the curtilage of a home, California v. Greenwood, 486 U. S. 35 (1988); the aerial surveillance of a fenced-in backyard from an altitude of 1,000 feet, California v. Ciraolo, 476 U. S. 207 (1986); the aerial observation of a partially exposed interior of a residential greenhouse from 400 feet above, Florida v. Riley, 488 U. S. 445 (1989); the aerial photography of an industrial complex from several thousand feet above, Dow Chemical Co. v. United States, 476 U. S. 227 (1986); and the observation of smoke emanating from chimney stacks, Air Pollution Variance Bd. of Colo. v. Western Alfalfa Corp., 416 U. S. 861 (1974).
from the exterior surfaces of petitioner's home; all that those measurements showed were relative differences in emission levels, vaguely indicating that some areas of the roof and outside walls were warmer than others. As still images from the infrared scans show, see Appendix, infra, no details regarding the interior of petitioner's home were revealed. Unlike an x-ray scan, or other possible "throughthe-wall" techniques, the detection of infrared radiation emanating from the home did not accomplish "an unauthorized physical penetration into the premises," Silverman v. United States, 365 U. S. 505, 509 (1961), nor did it "obtain information that it could not have obtained by observation from outside the curtilage of the house," United States v. Karo, 468 U. S. 705, 715 (1984).
in a laboratory or opium den, enter the public domain if and when they leave a building. A subjective expectation that they would remain private is not only implausible but also surely not "one that society is prepared to recognize as 'reasonable.'" Katz, 389 U. S., at 361 (Harlan, J., concurring).
Notwithstanding the implications of today's decision, there is a strong public interest in avoiding constitutional litigation over the monitoring of emissions from homes, and over the inferences drawn from such monitoring. Just as "the police cannot reasonably be expected to avert their eyes from evidence of criminal activity that could have been observed by any member of the public," Greenwood, 486 U. S., at 41, so too public officials should not have to avert their senses or their equipment from detecting emissions in the public domain such as excessive heat, traces of smoke, suspicious odors, odorless gases, airborne particulates, or radioactive emissions, any of which could identify hazards to the community. In my judgment, monitoring such emissions with "sense-enhancing technology," ante, at 34, and drawing useful conclusions from such monitoring, is an entirely reasonable public service.
(1984), to refute a point we do not make underscores the fact that the Court has no real answer (either in logic or in law) to the point we do make. Of course, Karo itself does not provide any support for the Court's view that inferences can amount to unconstitutional searches. The illegality in that case was "the monitoring of a beeper in a private residence" to obtain information that "could not have [been] obtained by observation from outside," id., at 714-715, rather than any thought processes that flowed from such monitoring.
justified, that certain facts will not come to the attention of the authorities"). The interest in concealing the heat escaping from one's house pales in significance to "the chief evil against which the wording of the Fourth Amendment is directed," the "physical entry of the home," United States v. United States Dist. Court for Eastern Dist. of Mich., 407 U. S. 297, 313 (1972), and it is hard to believe that it is an interest the Framers sought to protect in our Constitution.
4 This view comports with that of all the Courts of Appeals that have resolved the issue. See 190 F.3d 1041 (CA9 1999); United States v. Robinson, 62 F.3d 1325 (CAll 1995) (upholding warrantless use of thermal imager); United States v. Myers, 46 F.3d 668 (CA7 1995) (same); United States v. Ishmael, 48 F.3d 850 (CA5 1995) (same); United States v. Pinson, 24 F.3d 1056 (CA8 1994) (same). But see United States v. Cusumano, 67 F.3d 1497 (CAW 1995) (warrantless use of thermal imager violated Fourth Amendment), vacated and decided on other grounds, 83 F.3d 1247 (CAW 1996) (en bane).
Court's new rule is at once too broad and too narrow, and is not justified by the Court's explanation for its adoption. As I have suggested, I would not erect a constitutional impediment to the use of sense-enhancing technology unless it provides its user with the functional equivalent of actual presence in the area being searched.
Despite the Court's attempt to draw a line that is "not only firm but also bright," ante, at 40, the contours of its new rule are uncertain because its protection apparently dissipates as soon as the relevant technology is "in general public use," ante, at 34. Yet how much use is general public use is not even hinted at by the Court's opinion, which makes the somewhat doubtful assumption that the thermal imager used in this case does not satisfy that criterion.5 In any event, putting aside its lack of clarity, this criterion is somewhat perverse because it seems likely that the threat to privacy will grow, rather than recede, as the use of intrusive equipment becomes more readily available.
5 The record describes a device that numbers close to a thousand manufactured units; that has a predecessor numbering in the neighborhood of 4,000 to 5,000 units; that competes with a similar product numbering from 5,000 to 6,000 units; and that is "readily available to the public" for commercial, personal, or law enforcement purposes, and is just an 800number away from being rented from "half a dozen national companies" by anyone who wants one. App. 18. Since, by virtue of the Court's new rule, the issue is one of first impression, perhaps it should order an evidentiary hearing to determine whether these facts suffice to establish "general public use."
activity is not a search either. Nevertheless, the use of such a device would be unconstitutional under the Court's rule, as would the use of other new devices that might detect the odor of deadly bacteria or chemicals for making a new type of high explosive, even if the devices (like the dog sniffs) are "so limited both in the manner in which" they obtain information and "in the content of the information" they reveal. Ibid. If nothing more than that sort of information could be obtained by using the devices in a public place to monitor emissions from a house, then their use would be no more objectionable than the use of the thermal imager in this case.
The application of the Court's new rule to "any information regarding the interior of the home," ante, at 34, is also unnecessarily broad. If it takes sensitive equipment to detect an odor that identifies criminal conduct and nothing else, the fact that the odor emanates from the interior of a home should not provide it with constitutional protection. See supra, at 47 and this page. The criterion, moreover, is too sweeping in that information "regarding" the interior of a home apparently is not just information obtained through its walls, but also information concerning the outside of the building that could lead to (however many) inferences "regarding" what might be inside. Under that expansive view, I suppose, an officer using an infrared camera to observe a man silently entering the side door of a house at night carrying a pizza might conclude that its interior is now occupied by someone who likes pizza, and by doing so the officer would be guilty of conducting an unconstitutional "search" of the home.
did provide its user with the functional equivalent of access to a private place-such as, for example, the telephone booth involved in Katz, or an office building-then the rule should apply to such an area as well as to a home. See Katz, 389 U. S., at 351 ("[T]he Fourth Amendment protects people, not places").
The final requirement of the Court's new rule, that the information "could not otherwise have been obtained without physical intrusion into a constitutionally protected area," ante, at 34 (internal quotation marks omitted), also extends too far as the Court applies it. As noted, the Court effectively treats the mental process of analyzing data obtained from external sources as the equivalent of a physical intrusion into the home. See supra, at 44. As I have explained, however, the process of drawing inferences from data in the public domain should not be characterized as a search.
tive volume of sound leaving the booth, which presumably was discernible in the public domain.6 Surely, there is a significant difference between the general and well-settled expectation that strangers will not have direct access to the contents of private communications, on the one hand, and the rather theoretical expectation that an occasional homeowner would even care if anybody noticed the relative amounts of heat emanating from the walls of his house, on the other. It is pure hyperbole for the Court to suggest that refusing to extend the holding of Katz to this case would leave the homeowner at the mercy of "technology that could discern all human activity in the home." Ante, at 35-36.
6 The use of the latter device would be constitutional given Smith v.
Maryland, 442 U. S. 735, 741 (1979), which upheld the use of pen registers to record numbers dialed on a phone because, unlike "the listening device employed in Katz ... pen registers do not acquire the contents of communications."
outside of his house. Defendant's Exh. 107, p. 4. But even if the device could reliably show extraordinary differences in the amounts of heat leaving his home, drawing the inference that there was something suspicious occurring inside the residence-a conclusion that officers far less gifted than Sherlock Holmes would readily draw-does not qualify as "through-the-wall surveillance," much less a Fourth Amendment violation.
APPENDIX TO OPINION OF STEVENS, J. (Images and text reproduced from defendant's exhibit 107) Top left: Infrared image of a video frame from the videotape submitted as evidence in this case. The thermogram indicates the suspect house as it appeared with the Gain and contrast in its default setting. Only the outline of the house is visible. The camera used was the Thermovision 210. Top Right: Infrared image of a subsequent videoframe taken from the videotape. The gain and contrast settings have been increased in order to make the walls and roof of the structure appear hotter than what it actually is.
Bottom Right: The same image, but with the gain and contrast increased. This change in camera settings cause any object to appear hotter than what it actually is. The arrow indicates the overloading of an area immediately around a hot object in this case the electrical transformer and the streetlight. This overloading of the image is an inherent design flaw in the camera itself.

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