Mr. Justice Stewart
delivered the opinion of the Court.
On the afternoon of October 28, 1974, undercover police officer Barry Headricks of the Metropolitan Area Narcotics Squad knocked on the door of an apartment in Tucson, Ariz., occupied by the petitioner, Rufus Mincey. Earlier in the day, Officer Headricks had allegedly arranged to purchase a quantity of heroin from Mincey and had left, ostensibly to obtain money. On his return he was accompanied by nine other plainclothes policemen and a deputy county attorney. The door was opened by John Hodgman, one of three acquaintances of Mincey who were in the living room of the apartment. Officer Headricks slipped inside and moved quickly into the bedroom. Hodgman attempted to slam the door in order to keep the other officers from entering, but was pushed back against the wall. As the police entered the apartment, a rapid volley of shots was heard from the bedroom. Officer Headricks emerged and collapsed on the floor. When other officers entered the bedroom they found Mincey lying on the floor, wounded and semiconscious. Officer Headricks died a few hours later in the hospital.
The petitioner was indicted for murder, assault,1 and three [388]*388counts of narcotics offenses. He was tried at a single trial and convicted on all the charges. At his trial and on appeal, he contended that evidence used against him had been unlawfully-seized from his apartment without a warrant and that statements used to impeach his credibility were inadmissible because they had not been made voluntarily. The Arizona Supreme Court reversed the murder and assault convictions on state-law grounds,2 but affirmed the narcotics convictions. 115 Ariz. 472, 566 P. 2d 273. It held that the warrantless search of a homicide scene is permissible under the Fourth and Fourteenth Amendments and that Mincey’s statements were voluntary. We granted certiorari to consider these substantial constitutional questions. 434 U. S. 902.
I
The first question presented is whether the search of Mincey’s apartment was constitutionally permissible. After the shooting, the narcotics agents, thinking that other persons in the apartment plight have been injured, looked about quickly for other victims. They found a young woman wounded in the bedroom closet and Mincey apparently unconscious in the bedroom, as well as Mincey’s three acquaintances (one of whom had been wounded in the head) in the living room. Emergency assistance was requested, and some medical aid was administered to Officer Headricks. But the agents refrained from further investigation, pursuant to a Tucson Police Department directive that police officers should not investigate incidents in which they are involved. They neither searched further nor seized any evidence; they merely guarded the suspects and the premises.
Within 10 minutes, however, homicide detectives who had [389]*389heard a radio report of the shooting arrived and took charge of the investigation. They supervised the removal of Officer Headricks and the suspects, trying to make sure that the scene was disturbed as little as possible, and then proceeded to gather evidence. Their search lasted four days,3 during which period the entire apartment was searched, photographed, and diagrammed. The officers opened drawers, closets, and cupboards, and inspected their contents; they emptied clothing pockets; they dug bullet fragments out of the walls and floors; they pulled up sections of the carpet and removed them for examination. Every item in the apartment was closely examined and inventoried, and 200 to 300 objects were seized. In short, Mincey’s apartment was subjected to an exhaustive and intrusive search. No warrant was ever obtained.
The petitioner’s pretrial motion to suppress the fruits of this search was denied after a hearing. Much of the evidence introduced against him at trial (including photographs and diagrams, bullets and shell casings, guns, narcotics, and narcotics paraphernalia) was the product of the four-day search of his apartment. On appeal, the Arizona Supreme Court reaffirmed previous decisions in which it had held that the warrantless search of the scene of a homicide is constitutionally permissible.4 It stated its ruling as follows:
“We hold a reasonable, warrantless search of the scene of a homicide — or of a serious personal injury with likelihood of death where there is reason to suspect foul play— [390]*390does not violate the Fourth Amendment to the United States Constitution where the law enforcement officers were legally on the premises in the first instance. . . . For the search to be reasonable, the purpose must be limited to determining the circumstances of death and the scope must not exceed that purpose. The search must also begin within a reasonable period following the time when the officials first learn of the murder1 (or potential murder).” 115 Ariz., at 482, 566 P. 2d, at 283.
Since the investigating homicide detectives , knew that Officer Headricks was seriously injured, began the search promptly upon their arrival at the apartment, and searched only for evidence either establishing the circumstances of death or “relevant to motive and intent or knowledge (narcotics, e. g.),” id., at 483, 566 P. 2d, at 284, the court found that the warrant-less search of the petitioner’s apartment had not violated the Fourth and Fourteenth Amendments.
We cannot agree. The Fourth Amendment proscribes all unreasonable searches and seizures, and it is a cardinal principle that “searches conducted outside the judicial process, without prior approval by judge or magistrate, are per se unreasonable under the Fourth Amendment — subject only to a few specifically established and well-delineated exceptions.” Katz v. United States, 389 U. S. 347, 357 (footnotes omitted) ; see also South Dakota v. Opperman, 428 U. S. 364, 381 (Powell, J., concurring); Coolidge v. New Hampshire, 403 U. S. 443, 481; Vale v. Louisiana, 399 U. S. 30, 34; Terry v. Ohio, 392 U. S. 1, 20; Trupiano v. United States, 334 U. S. 699, 705. The Arizona Supreme Court did not hold that the search of the petitioner’s apartment fell within any of the exceptions to the warrant requirement previously recognized by this Court, but gather that the search of a homicide scene should be recognized as an additional exception.
Several reasons are advanced by the State to meet its “bur[391]*391den ... to show the existence of such an exceptional situation” as to justify creating a new exception to the warrant requirement. See Vale v. Louisiana, supra, at 34; United States v. Jeffers, 342 U. S. 48. 51. None of these reasons, however, persuades us of the validity of the generic exception delineated by the Arizona Supreme Court.
The first contention is that the search of the petitioner’s apartment did not invade any constitutionally protected right of privacy. See Katz v. United States, supra. This argument appears to have two prongs. On the one hand, the State urges that by shooting Officer Headricks, Mincey forfeited any reasonable expectation of privacy in his apartment.
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Mr. Justice Stewart
delivered the opinion of the Court.
On the afternoon of October 28, 1974, undercover police officer Barry Headricks of the Metropolitan Area Narcotics Squad knocked on the door of an apartment in Tucson, Ariz., occupied by the petitioner, Rufus Mincey. Earlier in the day, Officer Headricks had allegedly arranged to purchase a quantity of heroin from Mincey and had left, ostensibly to obtain money. On his return he was accompanied by nine other plainclothes policemen and a deputy county attorney. The door was opened by John Hodgman, one of three acquaintances of Mincey who were in the living room of the apartment. Officer Headricks slipped inside and moved quickly into the bedroom. Hodgman attempted to slam the door in order to keep the other officers from entering, but was pushed back against the wall. As the police entered the apartment, a rapid volley of shots was heard from the bedroom. Officer Headricks emerged and collapsed on the floor. When other officers entered the bedroom they found Mincey lying on the floor, wounded and semiconscious. Officer Headricks died a few hours later in the hospital.
The petitioner was indicted for murder, assault,1 and three [388]*388counts of narcotics offenses. He was tried at a single trial and convicted on all the charges. At his trial and on appeal, he contended that evidence used against him had been unlawfully-seized from his apartment without a warrant and that statements used to impeach his credibility were inadmissible because they had not been made voluntarily. The Arizona Supreme Court reversed the murder and assault convictions on state-law grounds,2 but affirmed the narcotics convictions. 115 Ariz. 472, 566 P. 2d 273. It held that the warrantless search of a homicide scene is permissible under the Fourth and Fourteenth Amendments and that Mincey’s statements were voluntary. We granted certiorari to consider these substantial constitutional questions. 434 U. S. 902.
I
The first question presented is whether the search of Mincey’s apartment was constitutionally permissible. After the shooting, the narcotics agents, thinking that other persons in the apartment plight have been injured, looked about quickly for other victims. They found a young woman wounded in the bedroom closet and Mincey apparently unconscious in the bedroom, as well as Mincey’s three acquaintances (one of whom had been wounded in the head) in the living room. Emergency assistance was requested, and some medical aid was administered to Officer Headricks. But the agents refrained from further investigation, pursuant to a Tucson Police Department directive that police officers should not investigate incidents in which they are involved. They neither searched further nor seized any evidence; they merely guarded the suspects and the premises.
Within 10 minutes, however, homicide detectives who had [389]*389heard a radio report of the shooting arrived and took charge of the investigation. They supervised the removal of Officer Headricks and the suspects, trying to make sure that the scene was disturbed as little as possible, and then proceeded to gather evidence. Their search lasted four days,3 during which period the entire apartment was searched, photographed, and diagrammed. The officers opened drawers, closets, and cupboards, and inspected their contents; they emptied clothing pockets; they dug bullet fragments out of the walls and floors; they pulled up sections of the carpet and removed them for examination. Every item in the apartment was closely examined and inventoried, and 200 to 300 objects were seized. In short, Mincey’s apartment was subjected to an exhaustive and intrusive search. No warrant was ever obtained.
The petitioner’s pretrial motion to suppress the fruits of this search was denied after a hearing. Much of the evidence introduced against him at trial (including photographs and diagrams, bullets and shell casings, guns, narcotics, and narcotics paraphernalia) was the product of the four-day search of his apartment. On appeal, the Arizona Supreme Court reaffirmed previous decisions in which it had held that the warrantless search of the scene of a homicide is constitutionally permissible.4 It stated its ruling as follows:
“We hold a reasonable, warrantless search of the scene of a homicide — or of a serious personal injury with likelihood of death where there is reason to suspect foul play— [390]*390does not violate the Fourth Amendment to the United States Constitution where the law enforcement officers were legally on the premises in the first instance. . . . For the search to be reasonable, the purpose must be limited to determining the circumstances of death and the scope must not exceed that purpose. The search must also begin within a reasonable period following the time when the officials first learn of the murder1 (or potential murder).” 115 Ariz., at 482, 566 P. 2d, at 283.
Since the investigating homicide detectives , knew that Officer Headricks was seriously injured, began the search promptly upon their arrival at the apartment, and searched only for evidence either establishing the circumstances of death or “relevant to motive and intent or knowledge (narcotics, e. g.),” id., at 483, 566 P. 2d, at 284, the court found that the warrant-less search of the petitioner’s apartment had not violated the Fourth and Fourteenth Amendments.
We cannot agree. The Fourth Amendment proscribes all unreasonable searches and seizures, and it is a cardinal principle that “searches conducted outside the judicial process, without prior approval by judge or magistrate, are per se unreasonable under the Fourth Amendment — subject only to a few specifically established and well-delineated exceptions.” Katz v. United States, 389 U. S. 347, 357 (footnotes omitted) ; see also South Dakota v. Opperman, 428 U. S. 364, 381 (Powell, J., concurring); Coolidge v. New Hampshire, 403 U. S. 443, 481; Vale v. Louisiana, 399 U. S. 30, 34; Terry v. Ohio, 392 U. S. 1, 20; Trupiano v. United States, 334 U. S. 699, 705. The Arizona Supreme Court did not hold that the search of the petitioner’s apartment fell within any of the exceptions to the warrant requirement previously recognized by this Court, but gather that the search of a homicide scene should be recognized as an additional exception.
Several reasons are advanced by the State to meet its “bur[391]*391den ... to show the existence of such an exceptional situation” as to justify creating a new exception to the warrant requirement. See Vale v. Louisiana, supra, at 34; United States v. Jeffers, 342 U. S. 48. 51. None of these reasons, however, persuades us of the validity of the generic exception delineated by the Arizona Supreme Court.
The first contention is that the search of the petitioner’s apartment did not invade any constitutionally protected right of privacy. See Katz v. United States, supra. This argument appears to have two prongs. On the one hand, the State urges that by shooting Officer Headricks, Mincey forfeited any reasonable expectation of privacy in his apartment. We have recently rejected a similar waiver argument in Michigan v. Tyler, 436 U. S. 499, 505-506; it suffices here to say that this reasoning would impermissibly convict the suspect even before the evidence against him was gathered.5 On the other hand, the State contends that the police entry to arrest Mincey was so great an invasion of his privacy that the additional intrusion caused by the search was constitutionally irrelevant. But this claim is hardly tenable in light of the extensive nature of this search. It is one thing to say that one who is legally taken into police custody has a lessened right of privacy in his person. See United States v. Edwards, 415 U. S. 800, 808-809; United States v. Robinson, 414 U. S. 218. It is quite another to argue that he also has a lessened right of privacy in his entire house. Indeed this very argument was rejected when it was advanced to support the warrantless search of a dwelling where a search occurred as “incident” to the arrest of its occupant. Chimel v. California, 395 U. S. 752, 766 n. 12. [392]*392Thus, this search cannot be justified on the ground that no constitutionally protected right of privacy was invaded.
The State’s second argument in support of its categorical exception to the warrant requirement is that a possible homicide presents an emergency situation demanding immediate action. We do not question the right of the police to respond to emergency situations. Numerous state 6 and federal7 cases have recognized that the Fourth Amendment does not bar police officers from making warrantless entries and searches when they reasonably believe that a person within is in need of immediate aid. Similarly, when the police come upon the scene of a homicide they may make a prompt warrantless search of the area to see if there are other victims or if a killer is still on the premises. Cf. Michigan v. Tyler, supra, at 509-510. "The need to protect or preserve life or avoid serious injury is justification for what would be otherwise illegal absent an exigency or emergency.” Wayne v. [393]*393United States, 115 U. S. App. D. C. 234, 241, 318 F. 2d 205, 212 (opinion of Burger, J.). And the police may seize any evidence that is in plain view during the course of their legitimate emergency activities. Michigan v. Tyler, supra, at 509-510; Coolidge v. New Hampshire, 403 U. S., at 465-466.
But a warrantless search must be “strictly circumscribed by the exigencies which justify its initiation,” Terry v. Ohio, 392 U. S., at 25-26, and it simply cannot be contended that this search was justified by any emergency threatening life or limb. All the persons in Mincey’s apartment had been located before the investigating homicide officers arrived there and began their search. And a four-day search that included opening dresser drawers and ripping up carpets can hardly be rationalized in terms of the legitimate concerns that justify an emergency search.
Third, the State points to the vital public interest in the prompt investigation of the extremely serious crime of murder. No one can doubt the importance of this goal. But the public interest in the investigation of other serious crimes is comparable. If the warrantless search of a homicide scene is reasonable, why not the warrantless search of the scene of a rape, a robbery, or a burglary? “No consideration relevant to the Fourth Amendment suggests any point of rational limitation” of such a doctrine. Chimel v. California, supra, at 766.
Moreover, the mere fact that law enforcement may be made more efficient can never by itself justify disregard of the Fourth Amendment. Cf. Coolidge v. New Hampshire, supra, at 481. The investigation of crime would always be simplified if warrants were unnecessary. But the Fourth Amendment reflects the view of those who wrote the Bill of Rights that the privacy of a person’s home and property may not be totally sacrificed in the name of maximum simplicity in enforcement of the criminal law. See United States v. Chadwick, 433 U. S. 1, 6-11. For this reason, warrants are [394]*394generally required to search a person’s home or his person unless “the exigencies of the situation” make the needs of law enforcement so compelling that the warrantless search is objectively reasonable under the Fourth Amendment. McDonald v. United States, 335 U. S. 451, 456; Johnson v. United States, 333 U. S. 10, 14—15. See, e. g., Chimel v. California, supra (search of arrested suspect and area within his control for weapons or evidence); Warden v. Hayden, 387 U. S. 294, 298-300 (“hot pursuit” of fleeing suspect); Schmerber v. California, 384 U. S. 757, 770-771 (imminent destruction of evidence) ; see also supra, at 392-393.
Except for the fact that the offense under investigation was a homicide, there were no exigent circumstances in this case, as, indeed, the Arizona Supreme Court recognized. 115 Ariz., at 482, 566 P. 2d, at 283. There was no indication that evidence would be lost, destroyed, or removed during the time required to obtain a search warrant. Indeed, the police guard at the apartment minimized that possibility. And there is no suggestion that a search warrant could not easily and conveniently have been obtained. We decline to hold that the seriousness of the offense under investigation itself creates exigent circumstances of the kind that under the Fourth Amendment justify a warrantless search.
Finally, the State argues that the “murder scene exception” is constitutionally permissible because it is narrowly confined by the guidelines set forth in the decision of the Arizona Supreme Court, see supra, at 389-390.8 In light of the extensive search that took place in this case it may be questioned what protection the guidelines afford a person in whose home a homicide or assault occurs. Indeed, these so-called guidelines [395]*395are hardly so rigidly confining as the State seems to assert. They confer unbridled discretion upon the individual officer to interpret such terms as “reasonable . . . search,” “serious personal injury with likelihood of death where there is reason to suspect foul play,” and “reasonable period.” It is precisely this kind of judgmental assessment of the reasonableness and scope of a proposed search that the Fourth Amendment requires be made by a neutral and objective magistrate, not a police officer. See, e. g., United States v. United States District Court, 407 U. S. 297, 316; Coolidge v. New Hampshire, supra, at 449-453; Mancusi v. DeForte, 392 U. S. 364, 371; Wong Sun v. United States, 371 U. S. 471, 481-482.
It may well be that the circumstances described by the Arizona Supreme Court would usually be constitutionally sufficient to warrant a search of substantial scope. But the Fourth Amendment requires that this judgment in each case be made in the first instance by a neutral magistrate.
“The point of the Fourth Amendment, which often is not grasped by zealous officers, is not that it denies law enforcement the support of the usual inferences which reasonable men draw from evidence. Its protection consists in requiring that those inferences be drawn by a neutral and detached magistrate instead of being judged by the officer engaged in the often competitive enterprise of ferreting out crime.” Johnson v. United States, supra, at 13-14.
In sum, we hold that the “murder scene exception” created by the Arizona Supreme Court is inconsistent with the Fourth and Fourteenth Amendments — that the warrantless search of Mincey’s apartment was not constitutionally permissible simply because a homicide had recently occurred there.9
[396]*396II
Since there will presumably be a new trial in this case,10 it is appropriate to consider also the petitioner's contention that statements he made from a hospital bed were involuntary, and therefore could not constitutionally be used against him at his trial.
Mincey was brought to the hospital after the shooting and taken immediately to the emergency room where he was examined and treated. He had sustained a wound in his hip, resulting in damage to the sciatic nerve and partial paralysis of his right leg. Tubes were inserted into his throat to help him breathe, and through his nose into his stomach to keep him from vomiting; a catheter was inserted into his bladder. He received various drugs, and a device was attached to his arm so that he could be fed intravenously. He was then taken to the intensive care unit.
At about eight o'clock that evening, Detective Hust of the Tucson Police Department came to the intensive care unit to interrogate him. Mincey was unable to talk because of the tube in his mouth, and so he responded to Detective Hust's questions by writing answers on pieces of paper provided by the hospital.11 Hust told Mincey he was under arrest for the murder of a police officer, gave him the warnings required by Miranda v. Arizona, 384 U. S. 436, and began to ask questions about the events that had taken place in Mincey's apartment a few hours earlier. Although Mincey asked repeatedly that the interrogation stop until he could get a lawyer, Hust continued to question him until almost midnight.
[397]*397After a pretrial hearing, see Jackson v. Denno, 378 U. S. 368, the trial court found that Mincey had responded to' this interrogation voluntarily.12 When Mincey took the witness stand at his trial his statements in response to Detective Hust’s questions were used in an effort to impeach his testimony in several respects.13 On appeal, the Arizona Supreme Court indicated its belief that because Detective Hust had failed to honor Mincey’s request for a lawyer, the statements would have been inadmissible as part of the prosecution’s case in chief. Miranda v. Arizona, supra. But, relying on Harris v. New York, 401 U. S. 222, and Oregon v. Hass, 420 U. S. 714, it held that since the trial court’s finding of voluntariness was not “clear[ly] and manifestly]” erroneous the statements were properly used for purposes of impeachment. 115 Ariz., at 480, 566 P. 2d, at 281.
Statements made by a defendant in circumstances violating the strictures of Miranda v. Arizona, supra, are admissible for [398]*398impeachment if their “trustworthiness . . . satisfies legal standards.” Harris v. New York, supra, at 224; Oregon v. Hass, supra, at 722. But any criminal trial use against a defendant of his involuntary statement is a denial of due process of law “even though there is ample evidence aside from the confession to support the conviction.” Jackson v. Denno, supra, at 376; Haynes v. Washington, 373 U. S. 503, 518; Lynumn v. Illinois, 372 U. S. 528, 537; Stroble v. California, 343 U. S. 181, 190; see Chapman v. California, 386 U. S. 18, 23 and n. 8. If, therefore, Mincey’s statements to Detective Hust were not “ ‘the product of a rational intellect and a free will,’ ” Townsend v. Sain, 372 U. S. 293, 307, quoting Blackburn v. Alabama, 361 U. S. 199, 208, his conviction cannot stand. In making this critical determination, we are not bound by the Arizona Supreme Court’s holding that the statements were voluntary. Instead, this Court is under a duty to make an independent evaluation of the record. Davis v. North Carolina, 384 U. S. 737, 741-742; Haynes v. Washington, supra, at 515-516.
It is hard to imagine a situation less conducive to the exercise of “a rational intellect and a free will” than Mincey’s. He had been seriously wounded just a few hours earlier, and had arrived at the hospital “depressed almost to the point of coma,” according to his attending physician. Although he had received some treatment, his condition at the time of Hust’s interrogation was still sufficiently serious that he was in the intensive care unit.14 He complained to Hust that the pain in his leg was “unbearable.” He was evidently confused and unable to think clearly about either the events of that afternoon or the circumstances of his interrogation, since some [399]*399of his written answers were on their face not entirely coherent.15 Finally, while Mincey was being questioned he was lying on his back on a hospital bed, encumbered by tubes, needles, and breathing apparatus. He was, in short, “at the complete mercy” of Detective Hust, unable to escape or resist the thrust of Hust’s interrogation. Cf. Beecher v. Alabama, 389 U. S. 35, 38.
In this debilitated and helpless condition, Mincey clearly expressed his wish not to be interrogated. As soon as Hust’s questions turned to the details of the afternoon’s events, Mincey wrote: “This is all I can say without a lawyer.” Hust nonetheless continued to question him, and a nurse who was present suggested it would be best if Mincey answered. Min-cey gave unresponsive or uninformative answers to several more questions, and then said again that he did not want to talk without a lawyer. Hust ignored that request and another made immediately thereafter.16 Indeed, throughout the in[400]*400terrogation Mincey vainly asked Hust to desist. Moreover, he complained several times that he was confused or unable to think clearly, or that he could answer more accurately [401]*401the next day.17 But despite Mincey’s entreaties to be let alone, Hust ceased the interrogation only during intervals when Mincey lost consciousness or received medical treatment, and after each such interruption returned relentlessly to his task. The statements at issue were thus the result of virtually continuous questioning of a seriously and painfully wounded man on the edge of consciousness.
There were not present in this case some of the gross abuses that have led the Court- in other cases to find confessions involuntary, such as beatings, see Brown v. Mississippi, 297 U. S. 278, or “truth serums,” see Townsend v. Sain, 372 U. S. 293. But “the blood of the accused is not the only hallmark of an unconstitutional inquisition.” Blackburn v. Alabama, 361 U. S., at 206. Determination of whether a statement is involuntary “requires more than a mere color-matching of cases.” Reck v. Pate, 367 U. S. 433, 442. It requires careful evaluation of all the circumstances of the interrogation.18
It is apparent from the record in this case that Mincey’s statements were not “the product of his free and rational choice.” Greénwald v. Wisconsin, 390 U. S. 519, 521. To the contrary, the undisputed evidence makes clear that Mincey wanted not to answer Detective Hust. But Mincey was weakened by pain and shock, isolated from family, friends, and legal counsel, and barely conscious, and his will was simply [402]*402overborne. Due process of law requires that statements obtained as these were cannot be used in any way against a defendant at his trial.
Ill
For the foregoing reasons, the judgment of the Arizona Supreme Court is reversed, and the case is remanded for further proceedings not inconsistent with this opinion.
It is so ordered.