MR. Chief Justice Burger
delivered the opinion of the Court.
We granted certiorari in this case to decide whether a search warrant is required before federal agents may open a locked footlocker which they have lawfully seized at the time of the arrest of its owners, when there is probable cause to believe the footlocker contains contraband.
(1)
On May 8, 1973, Amtrak railroad officials in San Diego observed respondents Gregory Machado and Bridget Leary load a brown footlocker onto a train bound for Boston. Their suspicions were aroused when they noticed that the trunk was unusually heavy for its size, and that it was leaking talcum powder, a substance often used to mask the odor of marihuana or hashish. Because Machado matched a profile used to spot drug traffickers, the railroad officials reported these circumstances to federal agents in San Diego, who in turn relayed the information, together with detailed descriptions of Machado and the footlocker, to their counterparts in Boston.
When the train arrived in Boston two days later, federal narcotics agents were on hand. Though the officers had not obtained an arrest or search warrant, they had with them a police dog trained to detect marihuana. The agents identified Machado and Leary and kept them under surveillance as they claimed their suitcases and the footlocker, which had been transported by baggage cart from the train to the departure area. Machado and Leary lifted the footlocker from the baggage cart, placed it on the floor and sat down on it.
The agents then released the dog near the footlocker. Without alerting respondents, the dog signaled the presence of a controlled substance inside. Respondent Chadwick then joined Machado and Leary, and they engaged an attendant to move the footlocker outside to Chadwick’s waiting automobile. Machado, Chadwick, and the attendant together lifted the 200-pound footlocker into the trunk of the car, while Leary waited in'the front seat. At that point, while the trunk of the car was still open and before the car engine had been started, the officers arrested all three. A search disclosed no weapons, but the keys to the footlocker were apparently taken from Machado.
Respondents were taken to the Federal Building in Boston; the agents followed with Chadwick’s car and the footlocker. As the Government concedes, from the moment of respondents’ arrests at about 9 p. m., the footlocker remained under the exclusive control of law enforcement officers at all times. The footlocker and luggage were placed in the Federal Building, where, as one of the agents later testified, “there was no risk that whatever was contained in the footlocker trunk would be removed by the defendants or their associates.” App. 44. The agents had no reason to believe that the footlocker contained explosives or other inherently dangerous items, or that it contained evidence which would lose its value unless the footlocker were opened at once. Facilities were readily available in which the footlocker could have been stored securely; it is not contended that there was any exigency calling for an immediate search.
At the Federal Building an hour and a half after the arrests, the agents opened the footlocker and luggage. They did not obtain respondents’ consent; they did not secure a search warrant. The footlocker was locked with a padlock and a regular trunk lock. It is unclear whether it was opened with the keys taken from respondent Machado, or by other means. Large amounts of marihuana were found in the footlocker.
Respondents were indicted for possession of marihuana with intent to distribute it, in violation of 21 U. S. C. § 841 (a) (1), and for conspiracy, in violation of 21 U. S. C. § 846. Before trial, they moved to suppress the marihuana obtained from the footlocker. In the District Court, the Government sought to justify its failure to secure a search warrant under the “automobile exception” of Chambers v. Maroney, 399 U. S. 42 (1970), and as a search incident to the arrests. Holding that “ [warrantless searches are per se unreasonable, subject to a few carefully delineated and limited exceptions,” the District Court rejected both justifications. 393 F. Supp. 763, 771 (Mass. 1975). The court saw the relationship between the footlocker and Chadwick’s automobile as merely coincidental, and held that the double-locked, 200-pound footlocker was not part of “the area from within which [respondents] might gain possession of a weapon or destructible evidence.” Chimel v. California, 395 U. S. 752, 763 (1969).
A divided Court of Appeals for the First Circuit affirmed the suppression of the seized marihuana. The court held that the footlocker had been properly taken into federal custody after respondents’ lawful arrest; it also agreed that the agents had probable cause to believe that the footlocker contained a controlled substance when they opened it. But probable cause alone was held not enough to sustain the warrantless search. On the premise that warrantless searches are per se unreasonable unless they fall within some established exception to the warrant requirement, the Court of Appeals agreed with the District Court that the footlocker search was not justified either under the “automobile exception” or as a search incident to a lawful arrest.
The Court of Appeals then responded to an argument, suggested by the Government for the first time on appeal, that movable personalty lawfully seized in a public place should be subject to search without a warrant if there exists probable cause to believe it contains evidence of a crime. Conceding that such personalty shares some characteristics of mobility which support warrantless automobile searches, the court nevertheless concluded that a rule permitting a search of personalty on probable cause alone had not yet “received sufficient recognition by the Supreme Court outside the automobile area, or generally, for us to recognize it as a valid exception to the fourth amendment warrant requirement.” 532 F. 2d 773, 781 (1976). We granted certiorari, 429 U. S. 814 (1976). We affirm.
(2)
In this Court the Government again contends that the Fourth Amendment Warrant Clause protects only interests traditionally identified with the home. Recalling the colonial writs of assistance, which were often executed in searches of private dwellings, the Government claims that the Warrant Clause was adopted primarily, if not exclusively, in response to unjustified intrusions into private homes on the authority of general warrants. The Government argues there is no evidence that the Framers of the Fourth Amendment intended to disturb the established practice of permitting warrantless searches outside the home, or to modify the initial clause of the Fourth Amendment by making warrantless searches supported by probable cause per se unreasonable.
Drawing on its reading of history, the Government argues that only homes, offices, and private communications implicate interests which lie at the core of the Fourth Amendment. Accordingly, it is only in these contexts that the determination whether a search or seizure is reasonable should turn on whether a warrant has been obtained. In all other situations, the Government contends, less significant privacy values are at stake, and the reasonableness of a government intrusion should depend solely on whether there is probable cause to believe evidence of criminal conduct is present. Where personal effects are lawfully seized outside the home on probable cause, the Government would thus regard searches without a warranty not “unreasonable.”
We do not agree that the Warrant Clause protects only dwellings and other specifically designated locales. As we have noted before, the Fourth Amendment “protects people, not places,” Katz v. United States, 389 U. S. 347, 351 (1967); more particularly, it protects people from unreasonable government intrusions into their legitimate expectations of privacy. In this case, the Warrant Clause makes a significant contribution to that protection. The question, then, is whether a warrantless search in these circumstances was unreasonable.
(3)
It cannot be doubted that the Fourth Amendment’s commands grew in large measure out of the colonists’ experience with the writs of assistance and their memories of the general warrants formerly in use in England. These writs, which were issued on executive rather than judicial authority, granted sweeping power to customs officials and other agents of the King to search at large for smuggled goods. Though the authority to search granted by the writs was not limited to the home, searches conducted pursuant to them often were carried out in private residences. See generally Stanford v. Texas, 379 U. S. 476, 481-485 (1965); Marcus v. Search Warrant, 367 U. S. 717, 724-729 (1961); Frank v. Maryland, 359 U. S. 360 (1959).
Although the searches and seizures which deeply concerned the colonists, and which were foremost in the minds of the Framers, were those involving invasions of the home, it would be a mistake to conclude, as the Government contends, that the Warrant Clause was therefore intended to guard only against intrusions into the home. First, the Warrant Clause does not in terms distinguish between searches conducted in private homes and other searches. There is also a strong historical connection between the Warrant Clause and the initial clause of the Fourth Amendment, which draws no distinctions among “persons, houses, papers, and effects” in safeguarding against unreasonable searches and seizures. See United States v. Rabinowits, 339 U. S. 56, 68 (1950) (Frankfurter, J., dissenting).
Moreover, if there is little evidence that the Framers intended the Warrant Clause to operate outside the home, there is no evidence at all that they intended to exclude from protection of the Clause all searches occurring outside the home. The absence of a contemporary outcry against war-rantless searches in public places was because, aside from searches incident to arrest, such warrantless searches were not a large issue in colonial America. Thus, silence in the historical record tells us little about the Framers' attitude toward application of the Warrant Clause to the search of respondents’ footlocker. What we do know is that the Framers were men who focused on the wrongs of that day but who intended the Fourth Amendment to safeguard fundamental values which would far outlast the specific abuses which gave it birth.
Moreover, in this area we do not write on a clean slate. Our fundamental inquiry in considering Fourth Amendment issues is whether or not a search or seizure is reasonable under all the circumstances. Cooper v. California, 386 U. S. 58 (1967). The judicial warrant has a significant role to play in that it provides the detached scrutiny of a neutral magistrate, which is a more reliable safeguard against improper searches than the hurried judgment of a law enforcement officer “engaged in the often competitive enterprise of ferreting out crime.” Johnson v. United States, 333 U. S. 10, 14 (1948). Once a lawful search has begun, it is also far more likely that it will not exceed proper bounds when it is done pursuant to a judicial authorization “particularly describing the place to be searched and the persons or things to be seized.” Further, a warrant assures 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. Camara v. Municipal Court, 387 U. S. 523, 532 (1967).
Just as the Fourth Amendment “protects people, not places,” the protections a judicial warrant offers against erroneous governmental intrusions are effective whether applied in or out of the home. Accordingly, we have held warrantless searches unreasonable, and therefore unconstitutional, in a variety of settings. A century ago, Mr. Justice Field, speaking for the Court, included within the reach of the Warrant Clause printed matter traveling through the mails within the United States:
“Letters and sealed packages of this kind in the mail are as fully guarded from examination and inspection, except as to their outward form and weight, as if they were retained by the parties forwarding them in their own domiciles. The constitutional guaranty of the right of the people to be secure in their papers against unreasonable searches and seizures extends to their papers, thus closed against inspection, wherever they may be. Whilst in the mail, they can only be opened and examined under like warrant, issued upon similar oath or affirmation, particularly describing the thing to be seized, as is required when papers are subjected to search in one’s own household.” Ex parte Jackson, 96 U. S. 727, 733 (1878).
We reaffirmed Jackson in United States v. Van Leeuwen, 397 U. S. 249 (1970), where a search warrant was obtained to open two packages which, on mailing, the sender had declared contained only coins. Judicial warrants have been required for other searches conducted outside the home. E. g., Katz v. United States, 389 U. S. 347 (1967) (electronic interception of conversation in public telephone booth); Coolidge v. New Hampshire, 403 U. S. 443 (1971) (automobile on private premises); Preston v. United States, 376 U. S. 364 (1964) (automobile in custody); United States v. Jeffers, 342 U. S. 48 (1961) (hotel room); G. M. Leasing Corp, v. United States, 429 U. S. 338 (1977) (office); Mancusi v. DeForte, 392 U. S. 364 (1968) (office). These cases illustrate the applicability of the Warrant Clause beyond the narrow limits suggested by the Government. They also reflect the settled constitutional principle, discussed earlier, that a fundamental purpose of the Fourth Amendment is to safeguard individuals from unreasonable government invasions of legitimate privacy interests, and not simply those interests found inside the four walls of the home. Wolf v. Colorado, 338 U. S. 25, 27 (1949).
In this case, important Fourth Amendment privacy interests were at stake. By placing personal effects inside a double-locked footlocker, respondents manifested an expectation that the contents would remain free from public examination. No less than one who locks the doors of his home against intruders, one who safeguards his personal possessions in this manner is due the protection of the Fourth Amendment Warrant Clause. There being no exigency, it was unreasonable for the Government to conduct this search without the safeguards a judicial warrant provides.
(4)
The Government does not contend that the footlocker’s brief contact with Chadwick’s car makes this an automobile search, but it is argued that the rationale of our automobile search cases demonstrates the reasonableness of permitting warrantless searches of luggage; the Government views such luggage as analogous to motor vehicles for Fourth Amendment purposes. It is true that, like the footlocker in issue here, automobiles are “effects” under the Fourth Amendment, and searches and seizures of automobiles are therefore subject to the constitutional standard of reasonableness. But this Court has recognized significant differences between motor vehicles and other property which permit warrantless searches of automobiles in circumstances in which warrantless searches would not be reasonable in other contexts. Carroll v. United States, 267 U. S. 132 (1925); Preston v. United States, supra, at 366-367; Chambers v. Maroney, 399 U. S. 42 (1970). See also South Dakota v. Opperman, 428 U. S. 364, 367 (1976).
Our treatment of automobiles has been based in part on their inherent mobility, which often makes obtaining a judicial warrant impracticable. Nevertheless, we have also sustained “warrantless searches of vehicles ... in cases in which the possibilities of the vehicle’s being removed or evidence in it destroyed were remote, if not nonexistent.” . Cady v. Dombrowski, 413 U. S. 433, 441-442 (1973); accord, South Dakota v. Opperman, supra, at 367; see Texas v. White, 423 U. S. 67 (1975); Chambers v. Maroney, supra; Cooper v. California, 386 U. S. 58 (1967).
The answer lies in the diminished expectation of privacy which surrounds the automobile:
“One has a lesser expectation of privacy in a motor vehicle because its function is transportation and it seldom serves as one’s residence or as the repository of personal effects. ... It travels public thoroughfares where both its occupants and its contents are in plain view.” Cardwell v. Lewis, 417 U. S. 583, 590 (1974) (plurality opinion).
Other factors reduce automobile privacy. “All States require vehicles to be registered and operators to be licensed. States and localities have enacted extensive and detailed codes regulating the condition and manner in which motor vehicles may be operated on public streets and highways.” Cady v. Dombrowski, supra, at 441. Automobiles periodically undergo official inspection, and they are often taken into police custody in the interests of public safety. South Dakota v. Opperman, supra, at 368.
The factors which diminish the privacy aspects of an automobile do not apply to respondents’ footlocker. Luggage contents are not open to public view, except as a condition to a border entry or common carrier travel; nor is luggage subject to regular inspections and official • scrutiny on a continuing basis. Unlike an automobile, whose primary function is transportation, luggage is intended as a repository of personal effects. In sum, a person’s expectations of privacy in personal luggage are substantially greater than in an automobile.
Nor does the footlocker’s mobility justify dispensing with the added protections of the Warrant Clause. Once the federal agents had seized it at the railroad station and had safely transferred it to the Boston Federal Building under their exclusive control, there was not the slightest danger that the footlocker or its contents could have been removed before a valid search warrant could be obtained. The initial seizure and detention of the footlocker, the validity of which respondents do not contest, were sufficient to guard against any risk that evidence might be lost. With the footlocker safely immobilized, it was unreasonable to undertake the additional and greater intrusion of a search without a warrant.
Finally, the Government urges that the Constitution permits the warrantless search- of any property in the possession of a person arrested in public, so long as there is probable cause to believe that the property contains contraband or evidence of crime. Although recognizing that the footlocker was not within respondents’ immediate control, the Government insists that the search was reasonable because the footlocker was seized contemporaneously with respondents' arrests and was searched as soon thereafter as was practicable. The reasons justifying search in a custodial arrest are quite different. When a custodial arrest is made, there is always some danger that the person arrested may seek to use a weapon, or that evidence may be concealed or destroyed. To safeguard himself and others, and to prevent the loss of evidence, it has been held reasonable for the arresting officer to conduct a prompt, warrantless “search of the arrestee’s person and the area ‘within his immediate control’ — construing that phrase to mean the area from within which he might gain possession of a weapon or destructible evidence.” Chimel v. California, 395 U. S., at 763. See also Terry v. Ohio, 392 U. S. 1 (1968).
Such searches may be conducted without a warrant, and they may also be made whether or not there is probable cause to believe that the person arrested may have a weapon or is about to destroy evidence. The potential dangers lurking in all custodial arrests make warrantless searches of items within the “immediate control” area reasonable without requiring the arresting officer to calculate the probability that weapons or destructible evidence may be involved. United States v. Robinson, 414 U. S. 218 (1973); Terry v. Ohio, supra. However, warrantless searches of luggage or other property seized at the time of an arrest cannot be justified as incident to that arrest either if the “search is remote in time or place from the arrest,” Preston v. United States, 376 U. S., at 367, or no exigency exists. Once law enforcement officers have reduced luggage or other personal property not immediately associated with the person of the arrestee to their exclusive control, and there is no longer any danger that the arrestee might gain access to the property to seize a weapon or destroy evidence, a search of that property is no longer an incident of the arrest.
Here the search was conducted more than an hour after federal agents had gained exclusive control of the footlocker and long after respondents were securely in custody; the search therefore cannot be viewed as incidental to the arrest or as justified by any other exigency. Even though on this record the issuance of a warrant by a judicial officer was reasonably predictable, a line must be drawn. In our view, when no exigency is shown to support the need for an immediate search, the Warrant Clause places the line at the point where the property to be searched comes under the exclusive dominion of police authority. Respondents were therefore entitled to the protection of the Warrant Clause with the evaluation of a neutral magistrate, before their privacy-interests in the contents of the footlocker were invaded.
Accordingly, the judgment is
Affirmed.
Marihuana was also found in the suitcases. The Court of Appeals found no adequate justification for the warrantless suitcase search, and suppressed this evidence. Incriminating statements made by respondent Chadwick during the arrest procedure were also suppressed, on the theory that there had not been probable cause to arrest him and that his statements were therefore tainted as the product of an illegal arrest. However, the petition for certiorari draws into question only the footlocker search; consequently, we need not pass on the legality of Chadwick’s arrest or the search of the suitcases.
The Fourth Amendment provides:
“The right of the people to be secure in their persons, houses, papersj and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.”
In this Court the Government has limited the question presented to “[w]hether a search warrant is required before federal agents may open a locked footlocker that is properly in their possession and that they have probable cause to believe contains contraband.” Accordingly, this case presents no issue of the application of the exclusionary rule.
The Government’s historical analysis is further undercut by its own arguments. The Government acknowledges that the core values the Fourth Amendment protects are privacy interests. In its view, those privacy interests which should receive the “maximum protection from governmental search or seizure” provided by the Warrant Clause include private oral and electronic communication, “[i]n addition to the home and other structures such as an office or hotel room . . . .” Brief for United States 30. It is not readily apparent how the Government’s contention that the Warrant Clause applies to high privacy areas, both within and without the home, can be reconciled with its earlier contention that judicial warrants are appropriate only for searches conducted within private dwellings.
In circumstances involving noncriminal inventory searches, where probable cause to search is irrelevant, we have recognized "that search warrants are not required, linked as the warrant requirement textually is to the probable-cause concept.” South Dakota v. Opperman, 428 U. S. 364, 370 n. 5 (1976). This is so because the salutary functions of a warrant simply have no application in that context; the constitutional reasonableness of inventory searches must be determined on other bases.
This has been settled law in this Court for over 90 years. At least since Boyd v. United States, 116 U. S. 616 (1886), we have known that “[i]t is not the breaking of his doors, and the rummaging of his drawers, that constitutes the essence of the offence; but it is the invasion of his indefeasible right of personal security, personal liberty and private property . . . .” Id., at 630.
This is not to say that the Fourth Amendment translates precisely into a constitutional privacy right. See Katz v. United States, 389 U. S. 347, 350-351 (1967).
This may often not be the case when automobiles are seized, Absolutely secure storage facilities may not be available, see South Dakota v. Opperman, 428 U. S. 364 (1976); Cady v. Dombrowski, 413 U. S. 433 (1973), and the size and inherent mobility of a vehicle malee it susceptible to theft or intrusion by vandals.
Respondents’ principal privacy interest in the footlocker was, of course, not in the container itself, which was exposed to public view, but in its contents. A search of the interior was therefore a far greater intrusion into Fourth Amendment values than the impoundment of the footlocker. Though surely a substantial infringement of’respondents’ use and possession, the seizure did not diminish respondents’ legitimate expectation that the footlocker’s contents would remain private.
It was the greatly reduced expectation of privacy in the automobile, coupled with the transportation function of the vehicle, which made the Court in Chambers unwilling to decide whether an immediate search of an automobile, or its seizure and indefinite immobilization, constituted a greater interference with the rights of the owner. This is clearly not the case with locked luggage.
Of course, there may be other justifications for a warrantless search of luggage taken from a suspect at the time of his arrest; for example, if officers have reason to believe that luggage contains some immediately dangerous instrumentality, such as explosives, it would be foolhardy to transport it to the station house without opening the luggage and dis>arming the weapon. See, e. g., United States v. Johnson, 467 F. 2d 630, 639 (CA2 1972).
TMike searches of the person, United States v. Robinson, 414 U. S. 218 (1973); United States v. Edwards, 415 U. S. 800 (1974), searches of possessions within an arrestee’s immediate control cannot be justified by any reduced expectations of privacy caused by the arrest. Respondents’ privacy interest in the contents of the footlocker was not eliminated simply because they were under arrest.