Opinion of ■ the Court by
Me. Justice Rehnquist,
announced by Me. Justice Blackmun.
Respondent Chester J. Dombrowski, was convicted in a Wisconsin state court of first-degree murder of Herbert McKinney and sentenced to life imprisonment. The conviction was upheld on appeal, State v. Dombrowski, 44 Wis. 2d 486, 171 N. W. 2d 349 (1969), the Wisconsin Supreme Court rejecting respondent's contention that certain evidence admitted at the trial had been unconstitutionally seized. Respondent then filed a petition for a writ of habeas corpus in federal district court, asserting the same constitutional claim. The District Court denied the petition but the United States Court of Appeals for the Seventh Circuit reversed, holding that one of the searches was unconstitutional under Preston v. United States, 376 U. S. 364 (1964), and the other unconstitu[435] tional for unrelated reasons. 471 F. 2d 280 (1972). We granted certiorari, 409 U. S. 1059 (1972).
I
On September 9, 1969, respondent was a member of the Chicago, Illinois, police force and either owned or possessed a 1960 Dodge automobile. That day he drove from Chicago to West Bend, Wisconsin, the county seat of Washington County, located some hundred-odd miles northwest of Chicago. He was identified as having been in two taverns in the small town of Kewaskum, Wisconsin, seven miles north of West Bend, during' the late evening of September 9 and the early morning of September 10. At some time before noon on the 10th, respondent’s automobile became disabled, and he had it towed to a farm owned by his brother in Fond du Lac County, which adjoins Washington County on the north. He then drove back to Chicago early that afternoon with his brother in the latter’s car.
Just before midnight of the same day, respondent rented a maroon 1967 Ford Thunderbird at O’Hare Field outside of Chicago, and apparently drove back to Wisconsin early the next morning. A tenant on his brother’s farm saw a car answering the description of the rented car pull alongside the disabled 1960 Dodge at approximately 4 a. m. At approximately 9:30 a. m. on September 11, respondent purchased two towels, one light brown and the other blue, from a department store in Kewaskum.
From 7 to 10:15 p. m. of the 11th, respondent was in a steak house or tavern in West Bend. He ate dinner and also drank, apparently quite heavily. He left the tavern and drove the 1967 Thunderbird in a direction away from West Bend toward his brother’s farm. On the way, respondent had an accident, with the Thunderbird breaking through a guard rail and crashing into a [436] bridge abutment. A passing motorist drove him into Kewaskum, and, after being let off in Kewaskum, respondent telephoned the police. Two police officers picked him up at a tavern and drove to the scene of the accident. On the way, the officers noticed that respondent appeared to be drunk; he offered three conflicting versions of how the accident occurred.
At the scene, the police observed the 1967 Thunderbird and took various measurements relevant to the accident. Respondent was, in the opinion of the officers, drunk. He had informed them that he was a Chicago police officer. The Wisconsin policemen believed that Chicago police officers were required by regulation to carry their service revolvers at all times. After calling a towtruck to remove the disabled Thunderbird, and not finding the revolver on respondent’s person, one of the officers looked into the front seat and glove compartment of that car for respondent’s service revolver. No revolver was found. The wrecker arrived and the Thunderbird was towed to a privately owned garage in Kewaskum, approximately seven miles from the West Bend police station. It was left outside by the wrecker, and no police guard was posted. At 11:33 p. m. on the 11th respondent was taken directly to the West Bend police station from the accident scene, and, after being interviewed by an assistant district attorney, to whom respondent again stated he was a Chicago policeman, respondent was formally arrested for drunken driving. Respondent was 'fin a drunken condition” and “incoherent at times.” Because of his injuries sustained in the accident, the same two officers took respondent to a local hospital. He lapsed into an unexplained coma, and a doctor, fearing the possibility of complications, had respondent hospitalized overnight for observation. One of the policemen remained at the hospital as a guard, and the other, Officer Weiss, drove at some time after [437]*4372 a. m. on the 12th to the garage to which the 1967 Thunderbird had been towed after the accident.
The purpose of going to the Thunderbird, as developed on the motion to suppress, was to look for respondent’s service revolver. Weiss testified that respondent did not have a revolver when he was arrested, and that the West Bend authorities were under the impression that Chicago police officers were required to carry their service revolvers at all times. He stated that the effort to find the revolver was “standard procedure in our department.”
Weiss opened the door of the Thunderbird and found, on the floor of the car, a book of Chicago police regulations and, between the two front seats, a flashlight which appeared to have “a few spots of blood on it.” He then opened the trunk of the car, which had been locked, and saw various items covered with what was later determined to be type 0 blood. These included a pair of police uniform trousers, a pair of gray trousers, a nightstick with the name “Dombrowski” stamped on it, a raincoat, a portion of a car floor mat, and a towel. The blood on the car mat was moist. The officer removed these items to the police station.
When, later that day, respondent was confronted with the condition of the items discovered in the trunk, he requested the presence of counsel before making any statement. After conferring with respondent, a lawyer told the police that respondent “authorized me to state he believed there was a body lying near the family picnic area at the north end of his brother’s farm.”
Fond du Lac County police went to the farm and found, in a dump, the body of a male, later identified as the decedent McKinney, clad only in a sportshirt. The deceased’s head was bloody; a white sock was found near the body. In observing the area, one officer looked through the window of the disabled 1960 Dodge, located [438] not far from where the body was found, and saw a pillowcase, backseat, and briefcase covered with blood. Police officials obtained, on the evening of the 12th, returnable within 48 hours, warrants to search the 1960 Dodge and the 1967 Thunderbird, as well as orders to impound both automobiles. The 1960 Dodge was examined at the farm on the 12th and then towed to the police garage where it was held as evidence. On the 13th, criminologists came from the Wisconsin Crime Laboratory in Madison and searched the Dodge; they seized the back and front seats, a white sock covered with blood, a part of a bloody rear floor mat, a briefcase, and a front floor mat. A return of the search warrant was filed in the county court on the 14th, but it did not recite that the sock and floor mat had been seized. At a hearing held on the 14th, the sheriff who executed the warrant did not specifically state that these two items had been seized.
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Opinion of ■ the Court by
Me. Justice Rehnquist,
announced by Me. Justice Blackmun.
Respondent Chester J. Dombrowski, was convicted in a Wisconsin state court of first-degree murder of Herbert McKinney and sentenced to life imprisonment. The conviction was upheld on appeal, State v. Dombrowski, 44 Wis. 2d 486, 171 N. W. 2d 349 (1969), the Wisconsin Supreme Court rejecting respondent's contention that certain evidence admitted at the trial had been unconstitutionally seized. Respondent then filed a petition for a writ of habeas corpus in federal district court, asserting the same constitutional claim. The District Court denied the petition but the United States Court of Appeals for the Seventh Circuit reversed, holding that one of the searches was unconstitutional under Preston v. United States, 376 U. S. 364 (1964), and the other unconstitu[435] tional for unrelated reasons. 471 F. 2d 280 (1972). We granted certiorari, 409 U. S. 1059 (1972).
I
On September 9, 1969, respondent was a member of the Chicago, Illinois, police force and either owned or possessed a 1960 Dodge automobile. That day he drove from Chicago to West Bend, Wisconsin, the county seat of Washington County, located some hundred-odd miles northwest of Chicago. He was identified as having been in two taverns in the small town of Kewaskum, Wisconsin, seven miles north of West Bend, during' the late evening of September 9 and the early morning of September 10. At some time before noon on the 10th, respondent’s automobile became disabled, and he had it towed to a farm owned by his brother in Fond du Lac County, which adjoins Washington County on the north. He then drove back to Chicago early that afternoon with his brother in the latter’s car.
Just before midnight of the same day, respondent rented a maroon 1967 Ford Thunderbird at O’Hare Field outside of Chicago, and apparently drove back to Wisconsin early the next morning. A tenant on his brother’s farm saw a car answering the description of the rented car pull alongside the disabled 1960 Dodge at approximately 4 a. m. At approximately 9:30 a. m. on September 11, respondent purchased two towels, one light brown and the other blue, from a department store in Kewaskum.
From 7 to 10:15 p. m. of the 11th, respondent was in a steak house or tavern in West Bend. He ate dinner and also drank, apparently quite heavily. He left the tavern and drove the 1967 Thunderbird in a direction away from West Bend toward his brother’s farm. On the way, respondent had an accident, with the Thunderbird breaking through a guard rail and crashing into a [436] bridge abutment. A passing motorist drove him into Kewaskum, and, after being let off in Kewaskum, respondent telephoned the police. Two police officers picked him up at a tavern and drove to the scene of the accident. On the way, the officers noticed that respondent appeared to be drunk; he offered three conflicting versions of how the accident occurred.
At the scene, the police observed the 1967 Thunderbird and took various measurements relevant to the accident. Respondent was, in the opinion of the officers, drunk. He had informed them that he was a Chicago police officer. The Wisconsin policemen believed that Chicago police officers were required by regulation to carry their service revolvers at all times. After calling a towtruck to remove the disabled Thunderbird, and not finding the revolver on respondent’s person, one of the officers looked into the front seat and glove compartment of that car for respondent’s service revolver. No revolver was found. The wrecker arrived and the Thunderbird was towed to a privately owned garage in Kewaskum, approximately seven miles from the West Bend police station. It was left outside by the wrecker, and no police guard was posted. At 11:33 p. m. on the 11th respondent was taken directly to the West Bend police station from the accident scene, and, after being interviewed by an assistant district attorney, to whom respondent again stated he was a Chicago policeman, respondent was formally arrested for drunken driving. Respondent was 'fin a drunken condition” and “incoherent at times.” Because of his injuries sustained in the accident, the same two officers took respondent to a local hospital. He lapsed into an unexplained coma, and a doctor, fearing the possibility of complications, had respondent hospitalized overnight for observation. One of the policemen remained at the hospital as a guard, and the other, Officer Weiss, drove at some time after [437]*4372 a. m. on the 12th to the garage to which the 1967 Thunderbird had been towed after the accident.
The purpose of going to the Thunderbird, as developed on the motion to suppress, was to look for respondent’s service revolver. Weiss testified that respondent did not have a revolver when he was arrested, and that the West Bend authorities were under the impression that Chicago police officers were required to carry their service revolvers at all times. He stated that the effort to find the revolver was “standard procedure in our department.”
Weiss opened the door of the Thunderbird and found, on the floor of the car, a book of Chicago police regulations and, between the two front seats, a flashlight which appeared to have “a few spots of blood on it.” He then opened the trunk of the car, which had been locked, and saw various items covered with what was later determined to be type 0 blood. These included a pair of police uniform trousers, a pair of gray trousers, a nightstick with the name “Dombrowski” stamped on it, a raincoat, a portion of a car floor mat, and a towel. The blood on the car mat was moist. The officer removed these items to the police station.
When, later that day, respondent was confronted with the condition of the items discovered in the trunk, he requested the presence of counsel before making any statement. After conferring with respondent, a lawyer told the police that respondent “authorized me to state he believed there was a body lying near the family picnic area at the north end of his brother’s farm.”
Fond du Lac County police went to the farm and found, in a dump, the body of a male, later identified as the decedent McKinney, clad only in a sportshirt. The deceased’s head was bloody; a white sock was found near the body. In observing the area, one officer looked through the window of the disabled 1960 Dodge, located [438] not far from where the body was found, and saw a pillowcase, backseat, and briefcase covered with blood. Police officials obtained, on the evening of the 12th, returnable within 48 hours, warrants to search the 1960 Dodge and the 1967 Thunderbird, as well as orders to impound both automobiles. The 1960 Dodge was examined at the farm on the 12th and then towed to the police garage where it was held as evidence. On the 13th, criminologists came from the Wisconsin Crime Laboratory in Madison and searched the Dodge; they seized the back and front seats, a white sock covered with blood, a part of a bloody rear floor mat, a briefcase, and a front floor mat. A return of the search warrant was filed in the county court on the 14th, but it did not recite that the sock and floor mat had been seized. At a hearing held on the 14th, the sheriff who executed the warrant did not specifically state that these two items had been seized.
At the trial, the State introduced testimony tending to establish that the deceased was first hit over the head and then shot with a .38-caliber gun, dying approximately an hour after the gunshot wound was inflicted; that death occurred at approximately 7 a. m. on the 11th, with a six-hour margin of error either way; that respondent owned two .38-caliber guns; that respondent had type A blood; that the deceased had type 0 blood and that the bloodstains found in the 1960 Dodge and on the items found in the two cars were type 0.
The prosecution introduced the nightstick discovered in the 1967 Thunderbird, and testimony that it had traces of type 0 blood on it; the portion of the floor mat found in the 1967 car, with testimony that it matched the portion of the floor mat found in the 1960 Dodge; the bloody towel found in the 1967 car, with testimony that it was identical to one of the towels purchased by respondent on the 11th; the police uniform trousers; and the sock [439] found in the 1960 Dodge, with testimony that it was identical in composition and stitching to that found near the body of the deceased.
The State’s case was based wholly on circumstantial evidence. The Supreme Court of Wisconsin, in reviewing the conviction on direct appeal, stated that “even though the evidence that led to his conviction was circumstantial, we have seldom seen a stronger collection of such evidence assembled and presented by the prosecution.” State v. Dombrowski, 44 Wis. 2d, at 507, 171 N. W. 2d, at 360.
II
The Fourth Amendment provides:
“The right of the people to be secure in their persons, houses, papers, 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.”
The ultimate standard set forth in the Fourth Amendment is reasonableness. In construing this command, there has been general agreement that “except in certain carefully defined classes of cases, a search of private property without proper consent is ‘unreasonable’ unless it has been authorized by a valid search warrant.” Camara v. Municipal Court, 387 U. S. 523, 528-529 (1967). See Coolidge v. New Hampshire, 403 U. S. 443, 454-455 (1971). One class of cases which constitutes at least a partial exception to this general rule is automobile searches. Although vehicles are “effects” within the meaning of the Fourth Amendment, “for the purposes of the Fourth Amendment there is a constitutional difference between houses and cars.” Chambers v. Maroney, 399 U. S. 42, 52 (1970). See Carroll v. [440] United States, 267 U. S. 132, 153-154 (1925). In Cooper v. California, 386 U. S. 58, 59 (1967), the identical proposition was stated in different language:
“We made it clear in Preston [v. United States] that whether a search and seizure is unreasonable within the meaning of the Fourth Amendment depends upon the facts and circumstances of each case and pointed out, in particular, that searches of cars that are constantly movable may make the search of a car without a warrant a reasonable one although the result might be the opposite in a search of a home, a store, or other fixed piece of property. 376 U. S., at 366-367.”
While these general principles are easily stated, the decisions of this Court dealing with the constitutionality of warrantless searches, especially when those searches are of vehicles, suggest that this branch of the law is something less than a seamless web.
Since this Court’s decision in Mapp v. Ohio, 367 U. S. 643 (1961), which overruled Wolf v. Colorado, 338 U. S. 25 (1949), and held that the provisions of the Fourth Amendment were applicable to the States through the Due Process Clause of the Fourteenth Amendment, the application of Fourth Amendment standards, originally intended to restrict only the Federal Government, to the States presents some difficulty when searches of automobiles are involved. The contact with vehicles by federal law enforcement officers usually, if not always, involves the detection or investigation of crimes unrelated to the operation of a vehicle. Cases such as Carroll v. United States, supra, and Brinegar v. United States, 338 U. S. 160 (1949), illustrate the typical situations in which federal officials come into contact with and search vehicles. In both cases, members of a special federal unit charged with enforcing a particular federal criminal [441] statute stopped and searched a vehicle when they had probable cause to believe that the operator was violating that statute.
As a result of our federal system of government, however, state and local police officers, unlike federal officers, have much more contact with vehicles for reasons related to the operation of vehicles themselves. 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.
Because of the extensive regulation of motor vehicles and traffic, and also because of the frequency with which a vehicle can become disabled or involved in an accident on public highways, the extent of police-citizen contact involving automobiles will be substantially greater than police-citizen contact in a home or office. Some such contacts will occur because the officer may believe the operator has violated a criminal statute, but many more will not be of that nature. Local police officers, unlike federal officers, frequently investigate vehicle accidents in which there is no claim of criminal liability and engage in what, for want of a better term, may be described as community caretaking functions, totally divorced from the detection, investigation, or acquisition of evidence relating to the violation of a criminal statute.
Although the original justification advanced for treating automobiles differently from houses, insofar as war-rantless searches of automobiles by federal officers was concerned, was the vagrant and mobile nature of the former, Carroll v. United States, supra; Brinegar v. United States, supra; cf. Coolidge v. New Hampshire, supra; Chambers v. Maroney, supra, warrantless searches of vehicles by state officers have been sustained in cases in which the possibilities of the vehicle’s being removed [442] or evidence in it destroyed were remote, if not nonexistent. See Harris v. United States, 390 U. S. 234 (1968) (District of Columbia police); Cooper v. California, supra. The constitutional difference between searches of and seizures from houses and similar structures and from vehicles stems both from the ambulatory character of the latter and from the fact that extensive, and often noncriminal contact with automobiles will bring local officials in “plain view” of evidence, fruits, or instrumentalities of a crime, or contraband. Cf. United States v. Biswell, 406 U. S. 311 (1972).
Here we must decide whether a “search”