CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT.
Stewart, J., delivered the opinion of the Court, in which Burger, C. J., and White, Blackmun, Powell, and Rehnquist, JJ., joined. Blackmun, J., filed a concurring opinion, post, p. 249. Powell, J., filed a concurring opinion in which Burger, C. J., and Rehnquist, J., joined, post, p. 250. Douglas, J., post, p. 275, Brennan, J., post, p. 276, and Marshall, J., post, p. 277, filed dissenting opinions.
MR. JUSTICE STEWART delivered the opinion of the Court.
It is well settled under the Fourth and Fourteenth Amendments that a search conducted without a warrant issued upon probable cause is " per se unreasonable . . . subject only to a few specifically established and well-delineated exceptions." Katz v. United States, 389 U.S. 347, 357; Coolidge v. New Hampshire, 403 U.S. 443, 454-455; Chambers v. Maroney, 399 U.S. 42, 51. It is equally well settled that one of the specifically established exceptions to the requirements of both a warrant and probable cause is a search that is conducted pursuant to consent. Davis v. United States, 328 U.S. 582, 593-594; Zap v. United States, 328 U.S. 624, 630. The constitutional question in the present case concerns the definition of "consent" in this Fourth and Fourteenth Amendment context.
The respondent was brought to trial in a California court upon a charge of possessing a check with intent to defraud.*fn1 He moved to suppress the introduction of certain material as evidence against him on the ground that the material had been acquired through an unconstitutional search and seizure. In response to the motion, the trial judge conducted an evidentiary hearing
where it was established that the material in question had been acquired by the State under the following circumstances:
While on routine patrol in Sunnyvale, California, at approximately 2:40 in the morning, Police Officer James Rand stopped an automobile when he observed that one headlight and its license plate light were burned out. Six men were in the vehicle. Joe Alcala and the respondent, Robert Bustamonte, were in the front seat with Joe Gonzales, the driver. Three older men were seated in the rear. When, in response to the policeman's question, Gonzales could not produce a driver's license, Officer Rand asked if any of the other five had any evidence of identification. Only Alcala produced a license, and he explained that the car was his brother's. After the six occupants had stepped out of the car at the officer's request and after two additional policemen had arrived, Officer Rand asked Alcala if he could search the car. Alcala replied, "Sure, go ahead." Prior to the search no one was threatened with arrest and, according to Officer Rand's uncontradicted testimony, it "was all very congenial at this time." Gonzales testified that Alcala actually helped in the search of the car, by opening the trunk and glove compartment. In Gonzales' words: "The police officer asked Joe [Alcala], he goes, 'Does the trunk open?' And Joe said, 'Yes.' He went to the car and got the keys and opened up the trunk." Wadded up under the left rear seat, the police officers found three checks that had previously been stolen from a car wash.
The trial judge denied the motion to suppress, and the checks in question were admitted in evidence at Bustamonte's trial. On the basis of this and other evidence he was convicted, and the California Court of Appeal for the First Appellate District affirmed the conviction.
Cal. App. 2d 648, 76 Cal. Rptr. 17. In agreeing that the search and seizure were constitutionally valid, the appellate court applied the standard earlier formulated by the Supreme Court of California in an opinion by then Justice Traynor: "Whether in a particular case an apparent consent was in fact voluntarily given or was in submission to an express or implied assertion of authority, is a question of fact to be determined in the light of all the circumstances." People v. Michael, 45 Cal. 2d 751, 753, 290 P. 2d 852, 854. The appellate court found that "in the instant case the prosecution met the necessary burden of showing consent . . . since there were clearly circumstances from which the trial court could ascertain that consent had been freely given without coercion or submission to authority. Not only officer Rand, but Gonzales, the driver of the automobile, testified that Alcala's assent to the search of his brother's automobile was freely, even casually given. At the time of the request to search the automobile the atmosphere, according to Rand, was 'congenial' and there had been no discussion of any crime. As noted, Gonzales said Alcala even attempted to aid in the search." 270 Cal. App. 2d, at 652, 76 Cal. Rptr., at 20. The California Supreme Court denied review.*fn2
Thereafter, the respondent sought a writ of habeas corpus in a federal district court. It was denied.*fn3 On appeal, the Court of Appeals for the Ninth Circuit, relying on its prior decisions in Cipres v. United States, 343 F.2d 95, and Schoepflin v. United States, 391 F.2d 390, set aside the District Court's order. 448 F.2d 699. The appellate court reasoned that a consent was a waiver of a person's Fourth and Fourteenth Amendment rights, and that the State was under an obligation to demonstrate,
not only that the consent had been uncoerced, but that it had been given with an understanding that it could be freely and effectively withheld. Consent could not be found, the court held, solely from the absence of coercion and a verbal expression of assent. Since the District Court had not determined that Alcala had known that his consent could have been withheld and that he could have refused to have his vehicle searched, the Court of Appeals vacated the order denying the writ and remanded the case for further proceedings. We granted certiorari to determine whether the Fourth and Fourteenth Amendments require the showing thought necessary by the Court of Appeals. 405 U.S. 953.
It is important to make it clear at the outset what is not involved in this case. The respondent concedes that a search conducted pursuant to a valid consent is constitutionally permissible. In Katz v. United States, 389 U.S., at 358, and more recently in Vale v. Louisiana, 399 U.S. 30, 35, we recognized that a search authorized by consent is wholly valid. See also Davis v. United States, 328 U.S., at 593-594; Zap v. United States, 328 U.S., at 630.*fn4 And similarly the State concedes that "when a prosecutor seeks to rely upon consent to justify the lawfulness of a search, he has the burden of proving that the consent was, in fact, freely and voluntarily given." Bumper v. North Carolina, 391 U.S. 543, 548. See also Johnson v. United States, 333 U.S. 10; Amos v. United States, 255 U.S. 313.
The precise question in this case, then, is what must the prosecution prove to demonstrate that a consent was "voluntarily" given. And upon that question there is a square conflict of views between the state and federal courts that have reviewed the search involved in the case before us. The Court of Appeals for the Ninth Circuit concluded that it is an essential part of the State's initial burden to prove that a person knows he has a right to refuse consent. The California courts have followed the rule that voluntariness is a question of fact to be determined from the totality of all the circumstances, and that the state of a defendant's knowledge is only one factor to be taken into account in assessing the voluntariness of a consent. See, e. g., People v. Tremayne, 20 Cal. App. 3d 1006, 98 Cal. Rptr. 193; People v. Roberts, 246 Cal. App. 2d 715, 55 Cal. Rptr. 62.
The most extensive judicial exposition of the meaning of "voluntariness" has been developed in those cases in which the Court has had to determine the "voluntariness" of a defendant's confession for purposes of the Fourteenth Amendment. Almost 40 years ago, in Brown v. Mississippi, 297 U.S. 278, the Court held that a criminal conviction based upon a confession obtained by brutality and violence was constitutionally invalid under the Due Process Clause of the Fourteenth Amendment. In some 30 different cases decided during the era that intervened between Brown and Escobedo v. Illinois, 378 U.S. 478, the Court was faced with the necessity of determining whether in fact the confessions in issue had been "voluntarily" given.*fn5 It is to that body
of case law to which we turn for initial guidance on the meaning of "voluntariness" in the present context.*fn6
Those cases yield no talismanic definition of "voluntariness," mechanically applicable to the host of situations where the question has arisen. "The notion of 'voluntariness,'" Mr. Justice Frankfurter once wrote, "is itself an amphibian." Culombe v. Connecticut, 367 U.S. 568, 604-605. It cannot be taken literally to mean a "knowing" choice. "Except where a person is unconscious or drugged or otherwise lacks capacity for conscious choice, all incriminating statements -- even those made under brutal treatment -- are 'voluntary' in the sense of representing a choice of alternatives. On the other hand, if 'voluntariness' incorporates notions of 'but-for' cause, the question should be whether the statement would have been made even absent inquiry or other official action. Under such a test, virtually no statement would be voluntary because very few people give incriminating statements in the absence of official action of some kind."*fn7 It is thus evident that neither linguistics nor epistemology will provide a ready definition of the meaning of "voluntariness."
Rather, "voluntariness" has reflected an accommodation of the complex of values implicated in police questioning
of a suspect. At one end of the spectrum is the acknowledged need for police questioning as a tool for the effective enforcement of criminal laws. See Culombe v. Connecticut, supra, at 578-580. Without such investigation, those who were innocent might be falsely accused, those who were guilty might wholly escape prosecution, and many crimes would go unsolved. In short, the security of all would be diminished. Haynes v. Washington, 373 U.S. 503, 515. At the other end of the spectrum is the set of values reflecting society's deeply felt belief that the criminal law cannot be used as an instrument of unfairness, and that the possibility of unfair and even brutal police tactics poses a real and serious threat to civilized notions of justice. "In cases involving involuntary confessions, this Court enforces the strongly felt attitude of our society that important human values are sacrificed where an agency of the government, in the course of securing a conviction, wrings a confession out of an accused against his will." Blackburn v. Alabama, 361 U.S. 199, 206-207. See also Culombe v. Connecticut, supra, at 581-584; Chambers v. Florida, 309 U.S. 227, 235-238.
This Court's decisions reflect a frank recognition that the Constitution requires the sacrifice of neither security nor liberty. The Due Process Clause does not mandate that the police forgo all questioning, or that they be given carte blanche to extract what they can from a suspect. "The ultimate test remains that which has been the only clearly established test in Anglo-American courts for two hundred years: the test of voluntariness. Is the confession the product of an essentially free and unconstrained choice by its maker? If it is, if he has willed to confess, it may be used against him. If it is not, if his will has been overborne and his capacity for self-determination critically impaired, the use of his
confession offends due process." Culombe v. Connecticut, supra, at 602.
In determining whether a defendant's will was over-borne in a particular case, the Court has assessed the totality of all the surrounding circumstances -- both the characteristics of the accused and the details of the interrogation. Some of the factors taken into account have included the youth of the accused, e. g., Haley v. Ohio, 332 U.S. 596; his lack of education, e. g., Payne v. Arkansas, 356 U.S. 560; or his low intelligence, e. g., Fikes v. Alabama, 352 U.S. 191; the lack of any advice to the accused of his constitutional rights, e. g., Davis v. North Carolina, 384 U.S. 737; the length of detention, e. g., Chambers v. Florida, supra ; the repeated and prolonged nature of the questioning, e. g., Ashcraft v. Tennessee, 322 U.S. 143; and the use of physical punishment such as the deprivation of food or sleep, e. g., Reck v. Pate, 367 U.S. 433.*fn8 In all of these cases, the Court determined the factual circumstances surrounding the confession, assessed the psychological impact on the accused, and evaluated the legal significance of how the accused reacted. Culombe v. Connecticut, supra, at 603.
The significant fact about all of these decisions is that none of them turned on the presence or absence of a single controlling criterion; each reflected a careful scrutiny of all the surrounding circumstances. See Miranda v. Arizona, 384 U.S. 436, 508 (Harlan, J., dissenting); id., at 534-535 (WHITE, J., dissenting). In none of them did the Court rule that the Due Process Clause required the prosecution to prove as part of its
initial burden that the defendant knew he had a right to refuse to answer the questions that were put. While the state of the accused's mind, and the failure of the police to advise the accused of his rights, were certainly factors to be evaluated in assessing the "voluntariness" of an accused's responses, they were not in and of themselves determinative. See, e. g., Davis v. North Carolina, supra; Haynes v. Washington, supra, at 510-511; Culombe v. Connecticut, supra, at 610; Turner v. Pennsylvania, 338 U.S. 62, 64.
Similar considerations lead us to agree with the courts of California that the question whether a consent to a search was in fact "voluntary" or was the product of duress or coercion, express or implied, is a question of fact to be determined from the totality of all the circumstances. While knowledge of the right to refuse consent is one factor to be taken into account, the government need not establish such knowledge as the sine qua non of an effective consent. As with police questioning, two competing concerns must be accommodated in determining the meaning of a "voluntary" consent -- the legitimate need for such searches and the equally important requirement of assuring the absence of coercion.
In situations where the police have some evidence of illicit activity, but lack probable cause to arrest or search, a search authorized by a valid consent may be the only means of obtaining important and reliable evidence.*fn9 In the present case for example, while the police had reason to stop the car for traffic violations, the State does not contend that there was probable cause to search the vehicle or that the search was incident to a valid arrest
of any of the occupants.*fn10 Yet, the search yielded tangible evidence that served as a basis for a prosecution, and provided some assurance that others, wholly innocent of the crime, were not mistakenly brought to trial. And in those cases where there is probable cause to arrest or search, but where the police lack a warrant, a consent search may still be valuable. If the search is conducted and proves fruitless, that in itself may convince the police that an arrest with its possible stigma and embarrassment is unnecessary, or that a far more extensive search pursuant to a warrant is not justified. In short, a search pursuant to consent may result in considerably less inconvenience for the subject of the search, and, properly conducted, is a constitutionally permissible and wholly legitimate aspect of effective police activity.
But the Fourth and Fourteenth Amendments require that a consent not be coerced, by explicit or implicit means, by implied threat or covert force. For, no matter how subtly the coercion was applied, the resulting "consent" would be no more than a pretext for the unjustified police intrusion against which the Fourth Amendment is directed. In the words of the classic admonition in Boyd v. United States, 116 U.S. 616, 635:
"It may be that it is the obnoxious thing in its mildest and least repulsive form; but illegitimate and unconstitutional practices get their first footing in that way, namely, by silent approaches and slight deviations from legal modes of procedure. This can only be obviated by adhering to the rule that constitutional provisions for the security of person and property should be liberally construed. A close
and literal construction deprives them of half their efficacy, and leads to gradual depreciation of the right, as if it consisted more in sound than in substance. It is the duty of courts to be watchful for the constitutional rights of the citizen, and against any stealthy encroachments thereon."
The problem of reconciling the recognized legitimacy of consent searches with the requirement that they be free from any aspect of official coercion cannot be resolved by any infallible touchstone. To approve such searches without the most careful scrutiny would sanction the possibility of official coercion; to place artificial restrictions upon such searches would jeopardize their basic validity. Just as was true with confessions, the requirement of a "voluntary" consent reflects a fair accommodation of the constitutional requirements involved. In examining all the surrounding circumstances to determine if in fact the consent to search was coerced, account must be taken of subtly coercive police questions, as well as the possibly vulnerable subjective state of the person who consents. Those searches that are the product of police coercion can thus be filtered out without undermining the continuing validity of consent searches. In sum, there is no reason for us to depart in the area of consent searches, from the traditional definition of "voluntariness."
The approach of the Court of Appeals for the Ninth Circuit finds no support in any of our decisions that have attempted to define the meaning of "voluntariness." Its ruling, that the State must affirmatively prove that the subject of the search knew that he had a right to refuse consent, would, in practice, create serious doubt whether consent searches could continue to be conducted. There might be rare cases where it could be proved from the record that a person in fact affirmatively knew of his
right to refuse -- such as a case where he announced to the police that if he didn't sign the consent form, "you [police] are going to get a search warrant;"*fn11 or a case where by prior experience and training a person had clearly and convincingly demonstrated such knowledge.*fn12 But more commonly where there was no evidence of any coercion, explicit or implicit, the prosecution would nevertheless be unable to demonstrate that the subject of the search in fact had known of his right to refuse consent.
The very object of the inquiry -- the nature of a person's subjective understanding -- underlines the difficulty of the prosecution's burden under the rule applied by the Court of Appeals in this case. Any defendant who was the subject of a search authorized solely by his consent could effectively frustrate the introduction into evidence of the fruits of that search by simply failing to testify that he in fact knew he could refuse to consent. And the near impossibility of meeting this prosecutorial burden suggests why this Court has never accepted any such litmus-paper test of voluntariness. It is instructive to recall the fears of then Justice Traynor of the California Supreme Court:
"It is not unreasonable for officers to seek interviews with suspects or witnesses or to call upon them at their homes for such purposes. Such inquiries, although courteously made and not accompanied with any assertion of a right to enter or search or secure answers, would permit the criminal to defeat his prosecution by voluntarily revealing all of the evidence against him and then contending that he acted only in response to an implied assertion of
unlawful authority." People v. Michael, 45 Cal. 2d, at 754, 290 P. 2d, at 854.
One alternative that would go far toward proving that the subject of a search did know he had a right to refuse consent would be to advise him of that right before eliciting his consent. That, however, is a suggestion that has been almost universally repudiated by both federal*fn13 and state courts,*fn14 and, we think, rightly so. For it would be thoroughly impractical to impose on the normal consent search the detailed requirements of an effective warning. Consent searches are part of the standard investigatory techniques of law enforcement
agencies. They normally occur on the highway, or in a person's home or office, and under informal and unstructured conditions. The circumstances that prompt the initial request to search may develop quickly or be a logical extension of investigative police questioning. The police may seek to investigate further suspicious circumstances or to follow up leads developed in questioning persons at the scene of a crime. These situations are a far cry from the structured atmosphere of a trial where, assisted by counsel if he chooses, a defendant is informed of his trial rights. Cf. Boykin v. Alabama, 395 U.S. 238, 243. And, while surely a closer question, these situations are still immeasurably far removed from "custodial interrogation" where, in Miranda v. Arizona, supra, we found that the Constitution required certain now familiar warnings as a prerequisite to police interrogation. Indeed, in language applicable to the typical consent search, we refused to extend the need for warnings:
"Our decision is not intended to hamper the traditional function of police officers in investigating crime. . . . When an individual is in custody on probable cause, the police may, of course, seek out evidence in the field to be used at trial against him. Such investigation may include inquiry of persons not under restraint. General on-the-scene questioning as to facts surrounding a crime or other general questioning of citizens in the fact-finding process is not affected by our holding. It is an act of responsible citizenship for individuals to give whatever information they may have to aid in law enforcement." 384 U.S., at 477-478.
Consequently, we cannot accept the position of the Court of Appeals in this case that proof of knowledge of the right to refuse consent is a necessary prerequisite
to demonstrating a "voluntary" consent. Rather, it is only by analyzing all the circumstances of an individual consent that it can be ascertained whether in fact it was voluntary or coerced. It is this careful sifting of the unique facts and circumstances of each case that is evidenced in our prior decisions involving consent searches.
For example, in Davis v. United States, 328 U.S. 582, federal agents enforcing wartime gasoline-rationing regulations, arrested a filling station operator and asked to see his rationing coupons. He eventually unlocked a room where the agents discovered the coupons that formed the basis for his conviction. The District Court found that the petitioner had consented to the search -- that although he had at first refused to turn the coupons over, he had soon been persuaded to do so and that force or threat of force had not been employed to persuade him. Concluding that it could not be said that this finding was erroneous, this Court, in an opinion by MR. JUSTICE DOUGLAS that looked to all the circumstances surrounding the consent, affirmed the judgment of conviction: "The public character of the property, the fact that the demand was made during business hours at the place of business where the coupons were required to be kept, the existence of the right to inspect, the nature of the request, the fact that the initial refusal to turn the coupons over was soon followed by acquiescence in the demand -- these circumstances all support the conclusion of the District Court." Id., at 593-594. See also Zap v. United States, 328 U.S. 624.
Conversely, if under all the circumstances it has appeared that the consent was not given voluntarily -- that it was coerced by threats or force, or granted only in submission to a claim of lawful authority -- then we have found the consent invalid and the search unreasonable. See, e. g., Bumper v. North Carolina, 391 U.S., at 548-549; Johnson v. United States, 333 U.S. 10; Amos v.
It is said, however, that a "consent" is a "waiver" of a person's rights under the Fourth and Fourteenth Amendments. The argument is that by allowing the police to conduct a search, a person "waives" whatever right he had to prevent the police from searching. It is argued that under the doctrine of Johnson v. Zerbst, 304 U.S. 458, 464, to establish such a "waiver" the State must demonstrate "an intentional relinquishment or abandonment of a known right or privilege."
But these standards were enunciated in Johnson in the context of the safeguards of a fair criminal trial. Our cases do not reflect an uncritical demand for a knowing and intelligent waiver in every situation where a person has failed to invoke a constitutional protection. As Mr. Justice Black once observed for the Court: "'Waiver' is a vague term used for a great variety of purposes, good and bad, in the law." Green v. United States, 355 U.S. 184, 191. With respect to procedural due process, for example, the Court has acknowledged that waiver is possible, while explicitly leaving open the question whether a "knowing and intelligent" waiver need be shown.*fn16 See D. H. Overmyer Co. v. Frick Co.,
The requirement of a "knowing" and "intelligent" waiver was articulated in a case involving the validity of a defendant's decision to forgo a right constitutionally guaranteed to protect a fair trial and the reliability of the truth-determining process. Johnson v. Zerbst, supra, dealt with the denial of counsel in a federal criminal trial. There the Court held that under the Sixth Amendment a criminal defendant is entitled to the assistance of counsel, and that if he lacks sufficient funds to retain counsel, it is the Government's obligation to furnish him with a lawyer. As Mr. Justice Black wrote for the Court: "The Sixth Amendment stands as a constant admonition that if the constitutional safeguards it provides be lost, justice will not 'still be done.' It embodies a realistic recognition of the obvious truth that the average defendant does not have the professional legal skill to protect himself when brought before a tribunal with power to take his life or liberty, wherein the prosecution is presented by experienced and learned counsel. That which is simple, orderly and necessary to the lawyer, to the untrained layman may appear intricate, complex and mysterious." 304 U.S., at 462-463 (footnote omitted). To preserve the fairness of the trial process the Court established an appropriately heavy burden on the Government before waiver could be found -- "an intentional
relinquishment or abandonment of a known right or privilege." Id., at 464.
Almost without exception, the requirement of a knowing and intelligent waiver has been applied only to those rights which the Constitution guarantees to a criminal defendant in order to preserve a fair trial.*fn18 Hence, and hardly surprisingly in view of the facts of Johnson itself, the standard of a knowing and intelligent waiver has most often been applied to test the validity of a waiver of counsel, either at trial,*fn19 or upon a guilty plea.*fn20 And the Court has also applied the Johnson criteria to assess the effectiveness of a waiver of other trial rights such as the right to confrontation,*fn21 to a jury trial,*fn22 and to a speedy trial,*fn23 and the right to be free from
twice being placed in jeopardy.*fn24 Guilty pleas have been carefully scrutinized to determine whether the accused knew and understood all the rights to which he would be entitled at trial, and that he had intentionally chosen to forgo them.*fn25 And the Court has evaluated the knowing and intelligent nature of the waiver of trial rights in trial-type situations, such as the waiver of the privilege against compulsory self-incrimination before an administrative agency*fn26 or a congressional committee,*fn27 or the waiver of counsel in a juvenile proceeding.*fn28
The guarantees afforded a criminal defendant at trial also protect him at certain stages before the actual trial, and any alleged waiver must meet the strict standard of an intentional relinquishment of a "known" right. But the "trial" guarantees that have been applied to the
"pretrial" stage of the criminal process are similarly designed to protect the fairness of the trial itself.
Hence, in United States v. Wade, 388 U.S. 218, and Gilbert v. California, 388 U.S. 263, the Court held "that a post-indictment pretrial lineup at which the accused is exhibited to identifying witnesses is a critical stage of the criminal prosecution; that police conduct of such a lineup without notice to and in the absence of his counsel denies the accused his Sixth [and Fourteenth] Amendment right to counsel . . . ." Id., at 272. Accordingly, the Court indicated that the standard of a knowing and intelligent waiver must be applied to test the waiver of counsel at such a lineup. See United States v. Wade, supra, at 237. The Court stressed the necessary interrelationship between the presence of counsel at a post-indictment lineup before trial and the protection of the trial process itself:
"Insofar as the accused's conviction may rest on a courtroom identification in fact the fruit of a suspect pretrial identification which the accused is helpless to subject to effective scrutiny at trial, the accused is deprived of that right of cross-examination which is an essential safeguard to his right to confront the witnesses against him. Pointer v. Texas, 380 U.S. 400. And even though cross-examination is a precious safeguard to a fair trial, it cannot be viewed as an absolute assurance of accuracy and reliability. Thus in the present context, where so many variables and pitfalls exist, the first line of defense must be the prevention of unfairness and the lessening of the hazards of eyewitness identification at the lineup itself. The trial which might determine the accused's fate may well not be that in the courtroom but that at the pretrial confrontation, with the State aligned against the accused, the
witness the sole jury, and the accused unprotected against the overreaching, intentional or unintentional, and with little or no effective appeal from the judgment there rendered by the witness -- 'that's the man.'" Id., at 235-236.
And in Miranda v. Arizona, 384 U.S. 436, the Court found that custodial interrogation by the police was inherently coercive, and consequently held that detailed warnings were required to protect the privilege against compulsory self-incrimination. The Court made it clear that the basis for decision was the need to protect the fairness of the trial itself:
"That counsel is present when statements are taken from an individual during interrogation obviously enhances the integrity of the fact-finding processes in court. The presence of an attorney, and the warnings delivered to the individual, enable the defendant under otherwise compelling circumstances to tell his story without fear, effectively, and in a way that eliminates the evils in the interrogation process. Without the protections flowing from adequate warnings and the rights of counsel, 'all the careful safeguards erected around the giving of testimony, whether by an accused or any other witness, would become empty formalities in a procedure where the most compelling possible evidence of guilt, a confession, would have already been obtained at the unsupervised pleasure of the police.'" Id., at 466.
The standards of Johnson were, therefore, found to be a necessary prerequisite to a finding of a valid waiver. See 384 U.S., at 475-479. Cf. Escobedo v. Illinois, 378 U.S., at 490 n. 14.*fn29
There is a vast difference between those rights that protect a fair criminal trial and the rights guaranteed under the Fourth Amendment. Nothing, either in the purposes behind requiring a "knowing" and "intelligent" waiver of trial rights, or in the practical application of such a requirement suggests that it ought to be extended to the constitutional guarantee against unreasonable searches and seizures.
A strict standard of waiver has been applied to those rights guaranteed to a criminal defendant to insure that he will be accorded the greatest possible opportunity to utilize every facet of the constitutional model of a fair criminal trial. Any trial conducted in derogation of that model leaves open the possibility that the trial reached an unfair result precisely because all the protections specified in the Constitution were not provided. A prime example is the right to counsel. For without that right, a wholly innocent accused faces the real and substantial danger that simply because of his lack of legal expertise he may be convicted. As Mr. Justice Harlan once wrote: "The sound reason why [the right to counsel] is so freely extended for a criminal trial is the severe injustice risked by confronting an untrained defendant with a range of technical points of law, evidence, and tactics familiar to the prosecutor but not to
himself." Miranda v. Arizona, supra, at 514 (dissenting opinion). The Constitution requires that every effort be made to see to it that a defendant in a criminal case has not unknowingly relinquished the basic protections that the Framers thought indispensable to a fair trial.*fn30
The protections of the Fourth Amendment are of a wholly different order, and have nothing whatever to do with promoting the fair ascertainment of truth at a criminal trial. Rather, as Mr. Justice Frankfurter's opinion for the Court put it in Wolf v. Colorado, 338 U.S. 25, 27, the Fourth Amendment protects the "security of one's privacy against arbitrary intrusion by the police . . . ." In declining to apply the exclusionary rule of Mapp v. Ohio, 367 U.S. 643, to convictions that had become final before rendition of that decision, the Court emphasized that "there is no likelihood of unreliability or coercion present in a search-and-seizure case," Linkletter v. Walker, 381 U.S. 618, 638. In Linkletter, the Court indicated that those cases that had been given retroactive effect went to "the fairness of the trial -- the very integrity of the fact-finding process. Here . . . the fairness of the trial is not under attack." Id., at 639. The Fourth Amendment "is not an adjunct to the ascertainment of truth." The guarantees of the Fourth Amendment stand "as a protection of quite different constitutional values -- values reflecting the concern of our society for the right of each individual to be let alone. To recognize this is no more than to accord those values undiluted respect." Tehan v. United States ex rel. Shott, 382 U.S. 406, 416.
Nor can it even be said that a search, as opposed to an eventual trial, is somehow "unfair" if a person consents to a search. ...