Ilinois v. Gates
Last updated
Last updated
(1983)
Supreme Court of the United States
Illinois v. Gates
JUSTICE REHNQUIST delivered the opinion of the Court.
Respondents Lance and Susan Gates were indicted for violation of state drug laws after police officers, executing a search warrant, discovered marijuana and other contraband in their automobile and home. Prior to trial the Gateses moved to suppress evidence seized during this search. The Illinois Supreme Court affirmed the decisions of lower state courts, granting the motion. It held that the affidavit submitted in support of the State’s application for a warrant to search the Gateses’ property was inadequate under this Court’s decisions in Aguilar v. Texas, (1964) and Spinelli v. United States, (1969).
We granted certiorari to consider the application of the Fourth Amendment to a magistrate’s issuance of a search warrant on the basis of a partially corroborated anonymous informant’s tip. [...]
We ... conclude that the Illinois Supreme Court read the requirements of our Fourth Amendment decisions too restrictively.
[...]
We now decide whether respondents’ rights under the Fourth and Fourteenth Amendments were violated by the search of their car and house. A chronological statement of events usefully introduces the issues at stake. Bloomingdale, Ill., is a suburb of Chicago located in DuPage County. On May 3, 1978, the Bloomingdale Police Department received by mail an anonymous handwritten letter which read as follows:
This letter is to inform you that you have a couple in your town who strictly make their living on selling drugs. They are Sue and Lance Gates, they live on Greenway, off Bloomingdale Rd. in the condominiums. Most of their buys are done in Florida. Sue his wife drives their car to Florida, where she leaves it to be loaded up with drugs, then Lance flys down and drives it back. Sue flys back after she drops the car off in Florida. May 3 she is driving down there again and Lance will be flying down in a few days to drive it back. At the time Lance drives the car back he has the trunk loaded with over $100,000.00 in drugs. Presently they have over $100,000.00 worth of drugs in their basement.
They brag about the fact they never have to work, and make their entire living on pushers.
I guarantee if you watch them carefully you will make a big catch. They are friends with some big drugs dealers, who visit their house often.
The letter was referred by the Chief of Police of the Bloomingdale Police Department to Detective Mader, who decided to pursue the tip. Mader learned, from the office of the Illinois Secretary of State, that an Illinois driver’s license had been issued to one Lance Gates, residing at a stated address in Bloomingdale. He contacted a confidential informant, whose examination of certain financial records revealed a more recent address for the Gates, and he also learned from a police officer assigned to O’Hare Airport that “L. Gates” had made a reservation on Eastern Airlines flight 245 to West Palm Beach, Fla., scheduled to depart from Chicago on May 5 at 4:15 p.m.
Mader then made arrangements with an agent of the Drug Enforcement Administration for surveillance of the May 5 Eastern Airlines flight. The agent later reported to Mader that Gates had boarded the flight, and that federal agents in Florida had observed him arrive in West Palm Beach and take a taxi to the nearby Holiday Inn. They also reported that Gates went to a room registered to one Susan Gates and that, at 7:00 a.m. the next morning, Gates and an unidentified woman left the motel in a Mercury bearing Illinois license plates and drove northbound on an interstate frequently used by travelers to the Chicago area. In addition, the DEA agent informed Mader that the license plate number on the Mercury registered to a Hornet station wagon owned by Gates. The agent also advised Mader that the driving time between West Palm Beach and Bloomingdale was approximately 22 to 24 hours.
Mader signed an affidavit setting forth the foregoing facts, and submitted it to a judge of the Circuit Court of DuPage County, together with a copy of the anonymous letter. The judge of that court thereupon issued a search warrant for the Gateses’ residence and for their automobile. The judge, in deciding to issue the warrant, could have determined that the modus operandi of the Gates had been substantially corroborated. As the anonymous letter predicted, Lance Gates had flown from Chicago to West Palm Beach late in the afternoon of May 5th, had checked into a hotel room registered in the name of his wife, and, at 7:00 a.m. the following morning, had headed north, accompanied by an unidentified woman, out of West Palm Beach on an interstate highway used by travelers from South Florida to Chicago in an automobile bearing a license plate issued to him.
At 5:15 a.m. on March 7th, only 36 hours after he had flown out of Chicago, Lance Gates, and his wife, returned to their home in Bloomingdale, driving the car in which they had left West Palm Beach some 22 hours earlier. The Bloomingdale police were awaiting them, searched the trunk of the Mercury, and uncovered approximately 350 pounds of marijuana. A search of the Gateses’ home revealed marijuana, weapons, and other contraband. The Illinois Circuit Court ordered suppression of all these items, on the ground that the affidavit submitted to the Circuit Judge failed to support the necessary determination of probable cause to believe that the Gateses’ automobile and home contained the contraband in question. This decision was affirmed in turn by the Illinois Appellate Court and by a divided vote of the Supreme Court of Illinois.
The Illinois Supreme Court concluded—and we are inclined to agree—that, standing alone, the anonymous letter sent to the Bloomingdale Police Department would not provide the basis for a magistrate’s determination that there was probable cause to believe contraband would be found in the Gateses’ car and home. The letter provides virtually nothing from which one might conclude that its author is either honest or his information reliable; likewise, the letter gives absolutely no indication of the basis for the writer’s predictions regarding the Gateses’ criminal activities. Something more was required, then, before a magistrate could conclude that there was probable cause to believe that contraband would be found in the Gateses’ home and car.
The Illinois Supreme Court also properly recognized that Detective Mader’s affidavit might be capable of supplementing the anonymous letter with information sufficient to permit a determination of probable cause. In holding that the affidavit in fact did not contain sufficient additional information to sustain a determination of probable cause, the Illinois court applied a “two-pronged test,” derived from our decision in Spinelli v. United States[.] The Illinois Supreme Court, like some others, apparently understood Spinelli as requiring that the anonymous letter satisfy each of two independent requirements before it could be relied on. According to this view, the letter, as supplemented by Mader’s affidavit, first had to adequately reveal the “basis of knowledge” of the letter writer—the particular means by which he came by the information given in his report. Second, it had to provide facts sufficiently establishing either the “veracity” of the affiant’s informant, or, alternatively, the “reliability” of the informant’s report in this particular case.
The Illinois court, alluding to an elaborate set of legal rules that have developed among various lower courts to enforce the “two-pronged test,” found that the test had not been satisfied. First, the “veracity” prong was not satisfied because, “there was simply no basis [for] … conclud[ing] that the anonymous person [who wrote the letter to the Bloomingdale Police Department] was credible.” The court indicated that corroboration by police of details contained in the letter might never satisfy the “veracity” prong, and in any event, could not do so if, as in the present case, only “innocent” details are corroborated. In addition, the letter gave no indication of the basis of its writer’s knowledge of the Gateses’ activities. The Illinois court understood Spinelli as permitting the detail contained in a tip to be used to infer that the informant had a reliable basis for his statements, but it thought that the anonymous letter failed to provide sufficient detail to permit such an inference. Thus, it concluded that no showing of probable cause had been made.
We agree with the Illinois Supreme Court that an informant’s “veracity,” “reliability” and “basis of knowledge” are all highly relevant in determining the value of his report. We do not agree, however, that these elements should be understood as entirely separate and independent requirements to be rigidly exacted in every case, which the opinion of the Supreme Court of Illinois would imply. Rather, as detailed below, they should be understood simply as closely intertwined issues that may usefully illuminate the commonsense, practical question whether there is “probable cause” to believe that contraband or evidence is located in a particular place.
“The process does not deal with hard certainties, but with probabilities. Long before the law of probabilities was articulated as such, practical people formulated certain common-sense conclusions about human behavior; jurors as factfinders are permitted to do the same—and so are law enforcement officers. Finally, the evidence thus collected must be seen and weighed not in terms of library analysis by scholars, but as understood by those versed in the field of law enforcement.”
As these comments illustrate, probable cause 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. Informants’ tips doubtless come in many shapes and sizes from many different types of persons.
Moreover, the “two-pronged test” directs analysis into two largely independent channels—the informant’s “veracity” or “reliability” and his “basis of knowledge.” There are persuasive arguments against according these two elements such independent status. Instead, they are better understood as relevant considerations in the totality-of-the-circumstances analysis that traditionally has guided probable cause determinations: a deficiency in one may be compensated for, in determining the overall reliability of a tip, by a strong showing as to the other, or by some other indicia of reliability.
If, for example, a particular informant is known for the unusual reliability of his predictions of certain types of criminal activities in a locality, his failure, in a particular case, to thoroughly set forth the basis of his knowledge surely should not serve as an absolute bar to a finding of probable cause based on his tip. Likewise, if an unquestionably honest citizen comes forward with a report of criminal activity—which if fabricated would subject him to criminal liability—we have found rigorous scrutiny of the basis of his knowledge unnecessary. Conversely, even if we entertain some doubt as to an informant’s motives, his explicit and detailed description of alleged wrongdoing, along with a statement that the event was observed first-hand, entitles his tip to greater weight than might otherwise be the case. Unlike a totality-of-the-circumstances analysis, which permits a balanced assessment of the relative weights of all the various indicia of reliability (and unreliability) attending an informant’s tip, the “two-pronged test” has encouraged an excessively technical dissection of informants’ tips, with undue attention being focused on isolated issues that cannot sensibly be divorced from the other facts presented to the magistrate.
Finely-tuned standards such as proof beyond a reasonable doubt or by a preponderance of the evidence, useful in formal trials, have no place in the magistrate’s decision. While an effort to fix some general, numerically precise degree of certainty corresponding to “probable cause” may not be helpful, it is clear that “only the probability, and not a prima facie showing, of criminal activity is the standard of probable cause.”
We also have recognized that affidavits “are normally drafted by nonlawyers in the midst and haste of a criminal investigation. Technical requirements of elaborate specificity once exacted under common law pleading have no proper place in this area.” Likewise, search and arrest warrants long have been issued by persons who are neither lawyers nor judges, and who certainly do not remain abreast of each judicial refinement of the nature of “probable cause.” The rigorous inquiry into the Spinelli prongs and the complex superstructure of evidentiary and analytical rules that some have seen implicit in our Spinelli decision, cannot be reconciled with the fact that many warrants are—quite properly—issued on the basis of nontechnical, common-sense judgments of laymen applying a standard less demanding than those used in more formal legal proceedings.
Similarly, we have repeatedly said that after-the-fact scrutiny by courts of the sufficiency of an affidavit should not take the form of de novo review. A magistrate’s “determination of probable cause should be paid great deference by reviewing courts.”
If the affidavits submitted by police officers are subjected to the type of scrutiny some courts have deemed appropriate, police might well resort to warrantless searches, with the hope of relying on consent or some other exception to the warrant clause that might develop at the time of the search. In addition, the possession of a warrant by officers conducting an arrest or search greatly reduces the perception of unlawful or intrusive police conduct, by assuring “the individual whose property is searched or seized of the lawful authority of the executing officer, his need to search, and the limits of his power to search.”
Finally, the direction taken by decisions following Spinelli poorly serves “the most basic function of any government”: “to provide for the security of the individual and of his property.” The strictures that inevitably accompany the “two-pronged test” cannot avoid seriously impeding the task of law enforcement . If, as the Illinois Supreme Court apparently thought, that test must be rigorously applied in every case, anonymous tips would be of greatly diminished value in police work. Ordinary citizens, like ordinary witnesses, generally do not provide extensive recitations of the basis of their everyday observations. Likewise, as the Illinois Supreme Court observed in this case, the veracity of persons supplying anonymous tips is by hypothesis largely unknown, and unknowable. As a result, anonymous tips seldom could survive a rigorous application of either of the Spinelli prongs. Yet, such tips, particularly when supplemented by independent police investigation, frequently contribute to the solution of otherwise “perfect crimes.” While a conscientious assessment of the basis for crediting such tips is required by the Fourth Amendment, a standard that leaves virtually no place for anonymous citizen informants is not.
For all these reasons, we conclude that it is wiser to abandon the “two-pronged test” established by our decisions in Aguilar and Spinelli. In its place we reaffirm the totality-of-the-circumstances analysis that traditionally has informed probable cause determinations. The task of the issuing magistrate is simply to make a practical, common-sense decision whether, given all the circumstances set forth in the affidavit before him, including the “veracity” and “basis of knowledge” of persons supplying hearsay information, there is a fair probability that contraband or evidence of a crime will be found in a particular place. And the duty of a reviewing court is simply to ensure that the magistrate had a “substantial basis for … conclud[ing]” that probable cause existed. We are convinced that this flexible, easily applied standard will better achieve the accommodation of public and private interests that the Fourth Amendment requires than does the approach that has developed from Aguilar and Spinelli.
Our earlier cases illustrate the limits beyond which a magistrate may not venture in issuing a warrant. A sworn statement of an affiant that “he has cause to suspect and does believe that” liquor illegally brought into the United States is located on certain premises will not do. An affidavit must provide the magistrate with a substantial basis for determining the existence of probable cause, and [a] wholly conclusory statement fail[s] to meet this requirement. An officer’s statement that “affiants have received reliable information from a credible person and believe” that heroin is stored in a home, is likewise inadequate. [T]his is a mere conclusory statement that gives the magistrate virtually no basis at all for making a judgment regarding probable cause. Sufficient information must be presented to the magistrate to allow that official to determine probable cause; his action cannot be a mere ratification of the bare conclusions of others. In order to ensure that such an abdication of the magistrate’s duty does not occur, courts must continue to conscientiously review the sufficiency of affidavits on which warrants are issued. But when we move beyond the “bare bones” affidavits this area simply does not lend itself to a prescribed set of rules, like that which had developed from Spinelli. Instead, the flexible, common-sense standard better serves the purposes of the Fourth Amendment’s probable cause requirement.
Our decisions applying the totality-of-the-circumstances analysis outlined above have consistently recognized the value of corroboration of details of an informant’s tip by independent police work. Likewise, we recognized the probative value of corroborative efforts of police officials in Aguilar—the source of the “two-pronged test”—by observing that if the police had made some effort to corroborate the informant’s report at issue, “an entirely different case” would have been presented.
The showing of probable cause in the present case was fully compelling . Even standing alone, the facts obtained through the independent investigation of Mader and the DEA at least suggested that the Gateses were involved in drug trafficking. In addition to being a popular vacation site, Florida is well-known as a source of narcotics and other illegal drugs. Lance Gates’ flight to Palm Beach, his brief, overnight stay in a motel, and apparent immediate return north to Chicago in the family car, conveniently awaiting him in West Palm Beach, is as suggestive of a pre-arranged drug run, as it is of an ordinary vacation trip.
In addition, the judge could rely on the anonymous letter, which had been corroborated in major part by Mader’s efforts. The corroboration of the letter’s predictions that the Gateses’ car would be in Florida, that Lance Gates would fly to Florida in the next day or so, and that he would drive the car north toward Bloomingdale all indicated, albeit not with certainty, that the informant’s other assertions also were true. “Because an informant is right about some things, he is more probably right about other facts” including the claim regarding the Gateses’ illegal activity. This may well not be the type of “reliability” or “veracity” necessary to satisfy some views of the “veracity prong” of Spinelli, but we think it suffices for the practical, common-sense judgment called for in making a probable cause determination. It is enough, for purposes of assessing probable cause, that “corroboration through other sources of information reduced the chances of a reckless or prevaricating tale,” thus providing “a substantial basis for crediting the hearsay.”
Finally, the anonymous letter contained a range of details relating not just to easily obtained facts and conditions existing at the time of the tip, but to future actions of third parties ordinarily not easily predicted. The letter writer’s accurate information as to the travel plans of each of the Gateses was of a character likely obtained only from the Gateses themselves, or from someone familiar with their not entirely ordinary travel plans. If the informant had access to accurate information of this type a magistrate could properly conclude that it was not unlikely that he also had access to reliable information of the Gateses’ alleged illegal activities. Of course, the Gateses’ travel plans might have been learned from a talkative neighbor or travel agent; under the “two-pronged test” developed from Spinelli, the character of the details in the anonymous letter might well not permit a sufficiently clear inference regarding the letter writer’s “basis of knowledge.” But, as discussed previously, probable cause does not demand the certainty we associate with formal trials. It is enough that there was a fair probability that the writer of the anonymous letter had obtained his entire story either from the Gateses or someone they trusted. And corroboration of major portions of the letter’s predictions provides just this probability. It is apparent, therefore, that the judge issuing the warrant had a “substantial basis for … conclud[ing]” that probable cause to search the Gateses’ home and car existed. The judgment of the Supreme Court of Illinois therefore must be
Reversed.
Justice BRENNAN, with whom Justice MARSHALL joins, dissenting.
I write to dissent from the Court’s unjustified and ill-advised rejection of the two-prong test for evaluating the validity of a warrant based on hearsay announced in Aguilar v. Texas, 378 U.S. 108 (1964), and refined in Spinelli v. United States, 393 U.S. 410 (1969).
In recognition of the judiciary’s role as the only effective guardian of Fourth Amendment rights, this Court has developed over the last half century a set of coherent rules governing a magistrate’s consideration of a warrant application and the showings that are necessary to support a finding of probable cause. We start with the proposition that a neutral and detached magistrate, and not the police, should determine whether there is probable cause to support the issuance of a warrant.
In order to emphasize the magistrate’s role as an independent arbiter of probable cause and to insure that searches or seizures are not effected on less than probable cause, the Court has insisted that police officers provide magistrates with the underlying facts and circumstances that support the officers’ conclusions. The Court stated that “[u]nder the Fourth Amendment, an officer may not properly issue a warrant to search a private dwelling unless he can find probable cause therefor from facts or circumstances presented to him under oath or affirmation. Mere affirmance of belief or suspicion is not enough.”
[Our previous cases] advance an important [ ] substantive value: Findings of probable cause, and attendant intrusions, should not be authorized unless there is some assurance that the information on which they are based has been obtained in a reliable way by an honest or credible person. As applied to police officers, the rules focus on the way in which the information was acquired. As applied to informants, the rules focus both on the honesty or credibility of the informant and on the reliability of the way in which the information was acquired. Insofar as it is more complicated, an evaluation of affidavits based on hearsay involves a more difficult inquiry. This suggests a need to structure the inquiry in an effort to insure greater accuracy. The standards announced in Aguilar, as refined by Spinelli, fulfill that need. The standards inform the police of what information they have to provide and magistrates of what information they should demand. The standards also inform magistrates of the subsidiary findings they must make in order to arrive at an ultimate finding of probable cause. By requiring police to provide certain crucial information to magistrates and by structuring magistrates’ probable cause inquiries, Aguilar and Spinelli assure the magistrate’s role as an independent arbiter of probable cause, insure greater accuracy in probable cause determinations, and advance the substantive value identified above.
Until today the Court has never squarely addressed the application of the Aguilar and Spinelli standards to tips from anonymous informants. By definition nothing is known about an anonymous informant’s identity, honesty, or reliability. One commentator has suggested that anonymous informants should be treated as presumptively unreliable. In any event, there certainly is no basis for treating anonymous informants as presumptively reliable. Nor is there any basis for assuming that the information provided by an anonymous informant has been obtained in a reliable way. If we are unwilling to accept conclusory allegations from the police, who are presumptively reliable, or from informants who are known, at least to the police, there cannot possibly be any rational basis for accepting conclusory allegations from anonymous informants.
In rejecting the Aguilar-Spinelli standards, the Court suggests that a “totality-of-the-circumstances approach is far more consistent with our prior treatment of probable cause than is any rigid demand that specific ‘tests’ be satisfied by every informant’s tip.” In support of this proposition the Court relies on the “practical, nontechnical” nature of probable cause.
[O]ne can concede that probable cause is a “practical, nontechnical” concept without betraying the values that Aguilar and Spinelli reflect. As noted, Aguilar and Spinelli require the police to provide magistrates with certain crucial information. They also provide structure for magistrates’ probable cause inquiries. In so doing, Aguilar and Spinelli preserve the role of magistrates as independent arbiters of probable cause, insure greater accuracy in probable cause determinations, and advance the substantive value of precluding findings of probable cause, and attendant intrusions, based on anything less than information from an honest or credible person who has acquired his information in a reliable way. Neither the standards nor their effects are inconsistent with a “practical, nontechnical” conception of probable cause. Once a magistrate has determined that he has information before him that he can reasonably say has been obtained in a reliable way by a credible person, he has ample room to use his common sense and to apply a practical, nontechnical conception of probable cause.
At the heart of the Court’s decision to abandon Aguilar and Spinelli appears to be its belief that “the direction taken by decisions following Spinelli poorly serves ‘the most basic function of any government: to provide for the security of the individual and of his property.’” This conclusion rests on the judgment that Aguilar and Spinelli “seriously imped[e] the task of law enforcement,” and render anonymous tips valueless in police work. Surely, the Court overstates its case. But of particular concern to all Americans must be that the Court gives virtually no consideration to the value of insuring that findings of probable cause are based on information that a magistrate can reasonably say has been obtained in a reliable way by an honest or credible person.
Rights secured by the Fourth Amendment are particularly difficult to protect because their “advocates are usually criminals.” But the rules “we fashion [are] for the innocent and guilty alike.” By replacing Aguilar and Spinelli with a test that provides no assurance that magistrates, rather than the police, or informants, will make determinations of probable cause; imposes no structure on magistrates’ probable cause inquiries; and invites the possibility that intrusions may be justified on less than reliable information from an honest or credible person, today’s decision threatens to “obliterate one of the most fundamental distinctions between our form of government, where officers are under the law, and the police-state where they are the law.”
The Gates Court rejects the Aguilar- Spinelli test’s insistence on using two specific measures to compose a (somewhat) mathematical formula for probable cause. As the Court explains, the existence of probable cause will not be found by entering “veracity” and “basis of knowledge” into a formula which yields the total weight of evidence presented to a magistrate.
As the Court puts it:
This totality-of-the-circumstances approach is far more consistent with our prior treatment of probable cause than is any rigid demand that specific ‘tests’ be satisfied by every informant’s tip. Perhaps the central teaching of our decisions bearing on the probable cause standard is that it is a ‘practical, nontechnical conception.’
When police have probable cause to believe either (1) that evidence of crime will be found in a particular place or (2) that a certain person has committed a crime, important police action becomes lawful that would have remained unlawful absent probable cause. One important example involves vehicle stops; police may stop a car based on probable cause to believe that its driver has committed a traffic law violation.
It is widely believed that many officers use this power for reasons other than traffic enforcement—for example, stopping drivers who violate trivial traffic rules in the hope of discovering evidence of more serious lawbreaking. In addition, some critics of police allege that at least some officers use their traffic-stop authority in ways that constitute unlawful discrimination, such as on the basis of race. Based on these beliefs and allegations, motorists have sought review of vehicle stops, justified by probable cause, on the basis of police officers’ “real” or “true” reasons for conducting the stops. The Court has resisted engaging in such review.
This totality-of-the-circumstances approach is far more consistent with our prior treatment of probable cause than is any rigid demand that specific “tests” be satisfied by every informant’s tip. Perhaps the central teaching of our decisions bearing on the probable cause standard is that it is a “practical, nontechnical conception.” “In dealing with probable cause, … as the very name implies, we deal with probabilities. These are not technical; they are the factual and practical considerations of everyday life on which reasonable and prudent men, not legal technicians, act.” Our observation in United States v. Cortez, (1981) regarding “particularized suspicion,” is also applicable to the probable cause standard:
The Court’s complete failure to provide any persuasive reason for rejecting Aguilar and Spinelli doubtlessly reflects impatience with what it perceives to be “overly technical” rules governing searches and seizures under the Fourth Amendment. Words such as “practical,” “nontechnical,” and “commonsense,” as used in the Court’s opinion, are but code words for an overly permissive attitude towards police practices in derogation of the rights secured by the Fourth Amendment. Everyone shares the Court’s concern over the horrors of drug trafficking, but under our Constitution only measures consistent with the Fourth Amendment may be employed by government to cure this evil. We must be ever mindful of Justice Stewart’s admonition in Coolidge v. New Hampshire, (1971), that “[i]n times of unrest, whether caused by crime or racial conflict or fear of internal subversion, this basic law and the values that it represents may appear unrealistic or ‘extravagant’ to some. But the values were those of the authors of our fundamental constitutional concepts.” In the same vein, Glasser v. United States, (1942), warned that “[s]teps innocently taken may, one by one, lead to the irretrievable impairment of substantial liberties.”
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