OPINION
¶ 1 The question presented is whether police officers lawfully conducted a protective sweep of a suspect’s apartment when he and other occupants were detained outside. We find the рrotective sweep violated the Fourth Amendment under the circumstances of this case.
I. FACTS AND PROCEDURAL BACKGROUND
¶ 2 In May 2006, Mesa police responded to a call alleging an aggravated assault. The victim, who was bleeding from a cut on his head, told police he had been pistol-whipped by a man known as “Taz.” The victim described Taz and directed police to an apartment complex where he believed Taz lived.
1Í3 Other officеrs went to that apartment complex, where Laquinn Anthony Fisher lived. After officers knocked and announced their presence, Fisher and two others came *565 out. None had a weapon and all three werе cooperative. Fisher, whose appearance matched the description given by the victim, identified himself to officers as “TA” 1
¶ 4 Despite having this information, officers thought further investigation was necessary because the gun allegedly used in the assault was still “unaccounted for.” Apparently without asking whether anyone was still inside, police entered the apartment to see if anyone else was present. Inside, officers smelled marijuana and observed open duffle bags containing marijuana. They did not find anyone in the apartment. After the sweep, officers obtained written consent from Fisher’s roommate to search the аpartment and seized the marijuana. Officers later brought the assault victim to the apartment, and he identified Fisher as his attacker.
¶ 5 Charged with various crimes, including possession of marijuana for sale, Fisher moved to suppress any evidence of the marijuana found in the apartment. The trial court denied the motion, and a jury subsequently found Fisher guilty of the possession charge.
2
The court of appeals affirmed, reasoning as fоllows: “Because the weapon used in the assault in this case was unaccounted for and the police articulated sufficient reasons for performing the sweep, ... the trial court did not err in determining that the рrotective sweep was supported by reasonable suspicion.”
State v. Fisher,
¶ 6 We granted Fisher’s petition for review because we previously have not considered the protective sweep doctrine, а matter of statewide importance. We have jurisdiction pursuant to Article 6, Section 5(3) of the Arizona Constitution and Arizona Revised Statutes (“A.R.S.”) § 12-120.24 (2003).
II. DISCUSSION
¶ 7 The Fourth Amendment to the United States Constitution protects “[t]he right of the peоple to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.”
3
“Unlawful entry into a home is the ‘chief evil’ against which the provision protects.”
State v. Guillen,
¶ 8 One such exception is the protective sweep, first recognized in
Maryland v. Buie,
¶ 9
Bide
thus authorizes two types of limited warrantless searches. The first involves the area immediately adjacent to the place of arrest.
Id.
The second allows a search of
*566
adjoining areas where рersons posing a danger might be found.
Id.; see also United States v. Archibald,
¶ 10 In Buie, officers conducted the protective sweep after arresting the defendant inside his residence. Here, in contrast, Fisher was detained outside his apartment and not arrested until after the protective sweep. 4 We assume, but do not decide, that a protective sweep is not forbidden when a suspect is detained and questioned but not yet arrested outside of a residence.
¶ 11 Although we have upheld protective sweeps based on exigent circumstances,
see, e.g., State v. DeWitt,
¶ 12
Buie
teaches that a protective sweep of a residence is permissible only if the officers have a reasonable belief supported by “specific and articulable facts” that a home “harbored an individual posing а danger to the officers or others.”
Buie,
¶ 13 The
common
thread
among cases
interpreting
Buie
is that officers must have specific articulable facts that someone whо could pose a safety threat is inside a residence.
See, e.g., United States v. Murphy,
¶ 14 We find particularly persuasive the Second Circuit’s decision in
Gandía.
There, officers responded to a reported dispute between a building superintendent and a tenant.
¶ 15 Similarly, the officers in this case could not articulate specific facts indicating that another person was inside Fisher’s apartment. The record does not reflect any attempt by the officers to find out hоw many people lived with Taz. Three people, including Fisher, exited the apartment. Fisher identified himself and matched the victim’s detailed description of the assailant. Although there was still an unaccounted-for wеapon, as in Gandía, nothing indicated that anyone else was inside the apartment. Officers cannot conduct protective sweeps based on mere speculation or the general risk inherent in all police work. Because the officers here did not articulate specific facts to establish a reasonable belief that someone might be in the apartment, the protective sweep was invalid.
¶ 16 We are mindful that:
[Pjolice officers have an incredibly difficult and dangerous task and are placed in life threatening situations on a regular basis. It would perhaps reduce the danger inherent in the job if we allowed the police tо do whatever they felt necessary, whenever they needed to do it, in whatever manner required, in every situation in which they must act. However, there is a Fourth Amendment to the Constitution which necessarily forecloses this рossibility.
United States v. Colbert,
HI. CONCLUSION
¶ 17 For the foregoing reasons, we vacate the court of appeals’ opinion and remand the case to the trial court for further proceedings.
Notes
. The responding officer testified that the police dispatch broadcast said the suspect went by both "TA” and "Taz.”
. Before trial, the State dismissed the other charges, including the aggravated assault charge.
. Although Fisher's petition cites Article 2, Section 8 of the Arizona Constitution, he does not develop any separate argument based on that provision or explain how any analysis under it should differ from Fourth Amendment analysis; nor did the court of appeals address this issue. Because a single reference to the Arizona Constitution is insufficient to preservе a claim, we do not address whether the protective sweep violated the Arizona Constitution.
State v. Dean,
. The State concedes in its supplemental brief that Fisher was not under arrest when the protective sweep occurred.
