Concept
Protective Sweeps
Search incident to lawful arrest
Protective Sweeps
Chimel v. California confines a search incident to an in-home arrest to the arrestee's person and the area within the arrestee's immediate control.1 That limit leaves a gap, because the arrestee may not be the only person in the house. Someone in a back room or a basement could attack the officers while their attention is fixed on the arrest, and a search confined to the arrestee's wingspan would never turn that person up. Maryland v. Buie closes the gap with a narrower tool: incident to an in-home arrest, officers may conduct a protective sweep of spaces beyond the arrestee's immediate control, within limits that depend on where they look.2 A protective sweep is a quick and limited search of premises, made after officers have lawfully entered and incident to an arrest, to protect the safety of officers or others, and it is confined to a cursory visual inspection of the places where a person might be hiding.3
The justification comes from the setting of the arrest. In the stop-and-frisk cases Terry and Long, the officer's interest was in knowing that the person confronted was not armed or able to reach a weapon, and Buie recognized an analogous interest in knowing that the house where a suspect is being arrested is not harboring other dangerous people who could launch an attack.4 The Court judged that risk to be as great as, and possibly greater than, the risk in a street or roadside encounter. A frisk happens before a confrontation has escalated to arrest, while a sweep accompanies the serious step of taking a person into custody, and an in-home arrest puts the officer on the adversary's turf, where an ambush in a confined space of unknown layout is more to be feared than one in open, familiar surroundings.5 Because the danger comes from unseen third parties rather than from the arrestee, Chimel's wingspan limit, which rested on the threat the arrestee poses, does not decide how far a sweep may go.6
The intrusion a sweep causes is still real, and the Court said so. It rejected the State's argument that entering rooms not examined before the arrest is a trivial intrusion to be disregarded, and it weighed the officers' safety interest against that intrusion instead.7 The result is a graduated rule in which the justification officers need grows as the space they want to look into moves away from the arrest. The subsections below take the two tiers in order and then the limits on manner and duration that apply to every sweep.
Adjoining Spaces
The first tier requires no justification beyond the arrest itself. As a precaution, and without probable cause or reasonable suspicion, officers may look in closets and other spaces immediately adjoining the place of arrest from which an attack could be immediately launched.8 The rule has two parts, and each has its own reason. The location requirement ties the tier to spaces from which an attack could come at once: a person crouched in a closet beside the arrest scene can strike in the seconds when officers are busy restraining and handcuffing the arrestee, so the danger is as immediate as the danger from the arrestee's own reach, even when the closet lies outside that reach. The absence of a suspicion requirement does subtler work. A closet door hides what is behind it, so officers standing in the room have no visible fact to point to, and a rule demanding articulable facts would ask them to justify a glance that takes a moment and exposes very little private space. Dropping the showing here matches the cost of the look to the size of the need.
The usual error on an exam stem is to read the first tier as permission to look through the whole house without any suspicion. The words that control are immediately adjoining, which reach the closet beside the arrest and the space just off the room where the arrest happens, and which do not reach the upstairs or the rooms down the hall. The tier also presupposes an arrest inside the home, because the premises create the ambush danger the Court described.9
Beyond Adjoining Spaces
Past the adjoining spaces, the arrest alone no longer suffices. Officers must point to articulable facts which, taken together with the rational inferences from those facts, would warrant a reasonably prudent officer in believing that the area to be swept harbors an individual posing a danger to those on the arrest scene.11 This is the same standard the Court applied in Terry and Long, a reasonable belief resting on specific facts.12 It falls short of probable cause: the Maryland Court of Appeals had required probable cause to believe that a serious and demonstrable potentiality for danger existed, and the Supreme Court called that an unnecessarily strict standard.13
The reason for asking for facts here, when none were needed beside the arrest, lies in the relation between need and intrusion. A room down the hall is not a place from which an attack can be launched immediately, and entering it opens more of the household's private space to inspection, which the Court refused to treat as trivial.14 The rule therefore asks officers to point to something about this house and this arrest that makes a hidden person a reasonable concern. It stops short of probable cause because the interest at stake, protecting officers from an ambush, is the same safety interest that supports a frisk on reasonable suspicion, and the Court found the same balance proper here.15
Buie itself shows what the question looks like, though not how it came out. Police held arrest warrants for Jerome Buie and his suspected accomplice Lloyd Allen after an armed robbery of a pizza restaurant, and six or seven officers went to Buie's house to arrest him.16 The officers fanned out through the first and second floors, and an officer with a drawn revolver shouted into the basement, ordering anyone down there to come out, until a voice asked who was calling and Buie emerged and was arrested, searched, and handcuffed.17 A detective then entered the basement "in case there was someone else" there and saw, in plain view, a red running suit like the one worn by one of the robbers.18
The Supreme Court did not decide that this sweep was valid. It held that the sweep would be permissible if the searching officer possessed a reasonable belief, based on specific and articulable facts, that the area swept harbored an individual posing a danger, and it vacated the judgment and remanded for application of that standard.19 The record facts, such as an outstanding warrant for a second robbery suspect and a voice answering from the basement, are the kind of circumstances officers can articulate, but whether they sufficed was left to the state court.
Exam stems often supply the justification in a single detail, such as a noise, a second suspect still at large, or a voice answering from another room, and the answer turns on spotting it. The opposite error treats a general sense that homes are dangerous as an articulable fact. A general sense applies to every arrest and so cannot distinguish this one, and the Court made clear that a sweep is not automatic, available only when justified by a reasonable, articulable suspicion that the house harbors a dangerous person.20
Scope and Duration of a Sweep
Every sweep, whichever tier justifies it, is bounded in what officers may do and in how long they may do it. A sweep is not a full search of the premises. It may extend only to a cursory inspection of those spaces where a person may be found, and it lasts no longer than necessary to dispel the reasonable suspicion of danger and in any event no longer than it takes to complete the arrest and depart the premises.22
The scope limit follows from the reason for the sweep. Officers may enter because a hidden person might attack them, so the only places they need to look are places where a person could be: closets, behind doors, under beds, in a basement stairwell. A dresser drawer, a briefcase, or a shoebox cannot conceal an adult, so opening one is no part of the sweep, however likely it is to hold evidence. Officers need not ignore what they see while looking where a person could hide. In Buie the running suit lay in plain view when the detective went into the basement, and the question before the Court was whether the sweep that exposed it was justified.23
The duration limit works the same way. The sweep exists to dispel a suspicion of danger, so once officers have looked in the places a person could be and found no one, the reason for being there has ended. Even if some suspicion lingers, the sweep cannot outlast the arrest, since the danger it answers is a danger to the people at the arrest scene, and once the arrest is complete and the officers leave there is no one left to protect.24
These limits also mark the difference between a sweep and the search Chimel forbade. Chimel concerned a full-blown search of an entire house for evidence of the crime for which the arrest was made, resting on the threat posed by the arrestee. A sweep rests on the threat posed by unseen third parties in the house and authorizes a far narrower intrusion, a cursory look in places a person could hide, available only when the justification is present.25 The two rules therefore operate side by side. Chimel still governs the search of the arrestee's person and wingspan for weapons and evidence,26 while Buie governs the look for other people, and if the sweep turns up a potential accomplice, that person may be frisked for weapons and the area within that person's immediate control searched for weapons and evidence.27
Step three usually decides the justification question, and step four decides the scope question, so a stem that passes the first tier can still fail on manner. A sweep is a look for people, not for evidence, and an officer who moves from checking closets to opening containers has left the rule behind even when the sweep itself was justified.
Adjoining Spaces
The lower tier of the sweep rule asks the least of officers. When police arrest someone inside a home, they may look, as a precaution and without probable cause or reasonable suspicion, in closets and other spaces immediately adjoining the place of arrest from which an attack could be immediately launched.34 That is the first of the two holdings in Maryland v. Buie, and it sets the baseline from which the stricter second tier, taken up in the next subsection, departs.35
Each half of the rule has its own reason. The location requirement rests on speed. While officers restrain, handcuff, and search the arrestee, their attention and hands are occupied, and a person waiting in a closet at the edge of the scene can strike in those seconds. Such a space may lie outside the arrestee's own reach, so the wingspan rule would not cover it, yet the danger it presents is just as immediate. The absence of a suspicion requirement does subtler work. A closed door hides what is behind it, so officers standing in the room have no visible fact to cite, and a rule demanding specific facts would ask them to justify a look at the very thing they cannot see. The look is also brief, because a protective sweep is confined to a cursory visual inspection of the places where a person might hide.36 The Court refused to treat entry into rooms not examined before the arrest as trivial, but it found the officers' interest in safety enough to outweigh that modest intrusion.37
Applied to an ordinary arrest, the rule permits a simple move. Officers who arrest a suspect in a hallway may open the closet door beside that spot and glance inside to confirm that no one is hiding there, with no justification beyond the fact of the arrest itself.38
The error to avoid on an exam stem is reading this tier as permission to check any space in the house. The words that control are immediately adjoining, which reach a closet beside the arrest and a space just off the room where it happens. The tier also presupposes an arrest inside the home, because the confined premises of unknown layout create the ambush risk that justifies the precaution.39 Distance from the arrest is what moves a look from the first tier to the second.
Beyond Adjoining Spaces
The first tier of a protective sweep asks officers for nothing beyond the arrest itself, but the second tier asks for facts. Once officers want to look past the spaces immediately adjoining the place of arrest, they need articulable facts which, taken together with the rational inferences from those facts, would warrant a reasonably prudent officer in believing that the area to be swept harbors an individual posing a danger to those on the arrest scene.41 That is the second holding of Maryland v. Buie, and the Court described it as no more and no less than what Terry and Long required of officers on the street and along the roadside.42 Those decisions ask whether specific facts, with their rational inferences, reasonably warrant a belief that a person nearby poses a danger, so the sweep standard carries a familiar threshold into the home.43 It also replaced a stricter test. The Maryland Court of Appeals had suppressed the evidence because the officer lacked probable cause to believe that a serious and demonstrable potentiality for danger existed, and the Supreme Court held that requirement unnecessarily strict.44
Each half of the standard has its own reason. The demand for facts exists because a room down the hall is not a place from which an attack can be launched at once, and entering it exposes more of the household's private space to inspection, an intrusion the Court refused to dismiss as trivial.45 Something about this house and this arrest must therefore make a hidden person a reasonable concern, and that requirement keeps the sweep from becoming an automatic feature of every in-home arrest.46 The ceiling at reasonable suspicion rather than probable cause does subtler work. The interest at stake is protection against an ambush, the same interest that supports a frisk on the street, and an in-home arrest puts officers on their adversary's turf in a confined space of unknown layout, where the danger is as great as or greater than at a roadside stop.47 Because the need matches the one in Terry and Long, the same level of justification suffices.
The facts of Buie show the kind of circumstance an officer can point to, though not how the Court resolved them. Police held arrest warrants for Jerome Buie and for Lloyd Allen, his suspected accomplice in the armed robbery of a pizza restaurant, and six or seven officers went to Buie's house to arrest him.48 With officers spread through the first and second floors, one shouted into the basement with a drawn revolver until a voice asked who was calling and Buie came up the stairs, after which he was arrested, searched, and handcuffed.49 A detective then went into the basement to see whether anyone else was down there and saw a red running suit, like the one worn by one of the robbers, lying in plain view.50 An accomplice still at large and a voice answering from below are circumstances an officer can articulate, but the Supreme Court did not decide whether they sufficed. It held that the sweep would be permissible if the searching officer had a reasonable belief, based on specific and articulable facts, that the basement harbored a dangerous person, and it vacated the judgment and remanded so the state court could apply that standard.51
On an exam stem, the second tier is usually won or lost on a single detail. A noise, an accomplice still at large, or a voice answering from another room supplies the articulable fact, while the bare statement that officers were making an arrest in a house does not. The common error treats the arrest alone as enough for rooms that do not adjoin the arrest scene, which collapses the two tiers into one. The opposite error demands probable cause, a standard the Court rejected as unnecessarily strict.52 Even when the facts justify entry, the sweep stays confined to a cursory look in places where a person could hide, a limit taken up next.
Scope and Duration of a Sweep
The justification for a sweep and the manner of a sweep are separate questions. The two tiers described above decide whether officers may look for a hidden person at all, and two further limits decide how far that look may go and how long it may last. Both limits apply to every sweep, whichever tier supplied the justification. In Maryland v. Buie the Court described a protective sweep as a quick and limited search of premises, incident to an arrest and conducted to protect the safety of police officers or others, narrowly confined to a cursory visual inspection of the places where a person might be hiding.54 A justified sweep therefore extends only to a cursory inspection of those spaces where a person may be found, and it lasts no longer than necessary to dispel the reasonable suspicion of danger and in any event no longer than it takes to complete the arrest and depart the premises.55
The scope limit follows directly from the reason officers may enter unexamined space in the first place. An in-home arrest puts officers on their adversary's turf, in a confined setting of unknown layout, where an ambush is more to be feared than on an open street, and a person waiting out of sight could strike while the officers' hands and attention are on the arrestee.56 The only danger the sweep answers is that of an unseen person, so the look is confined to places that could conceal one: a closet, the space behind a door, the area beneath a bed, a basement stairwell. A dresser drawer, a briefcase, or a shoebox cannot hold an adult, and opening one addresses no threat to anyone, however likely the container is to hold evidence. Officers need not look away from what comes into view while they check proper places, and in Buie the item at issue was a running suit seized in plain view during the sweep, a doctrine taken up elsewhere.57
The time limit rests on the same reasoning and has two outer bounds. The first is the concern that justified the sweep. Once officers have looked in the places a person could be and found no one, that concern has been answered and the sweep must stop.58 The second is the arrest itself. The danger the sweep answers is a danger to the people on the arrest scene, so even when some doubt lingers, the sweep cannot outlast the arrest, because once the arrest is complete and the officers have left there is no one remaining at risk.59 Whichever bound arrives first ends the officers' authority to keep looking.
These limits also show why a sweep differs from the search that Chimel v. California restricted. Chimel allows a search incident to arrest of the arrestee's person and the area within the arrestee's immediate control, from which a weapon or destructible evidence might be reached, and it forbids a search of the entire premises.60 Buie explained that a sweep survives that holding for two reasons. Chimel concerned a full-blown search of an entire house for evidence of the crime of arrest, which is far broader than a cursory look in hiding places, and the justification in Chimel was the threat posed by the arrestee, while a sweep responds to the threat posed by the house, or more properly by unseen third parties in it.61 The two rules therefore run side by side. Chimel governs what officers may search for weapons and evidence near the arrestee, and Buie governs a brief look for other people. Neither one lets officers go through the rest of the house for evidence without a warrant.62
Step one usually decides a scope stem and step three usually decides a duration stem. A sweep that was properly justified at the start can still lose evidence when the officers' conduct drifts past either limit, because a drawer cannot hide a person and the justification for the look ends where the possibility of a hidden person ends. The typical exam pattern pairs a valid justification with an officer who then opens a container or lingers after the arrest, so the justification question is answered yes and the scope or duration question is answered no.