Michigan v. Fisher, 558 U.S. 45 (2009). · Go Syfert
Michigan v. Fisher, 558 U.S. 45 (2009). Cases Citing This Book View Copy Cite
Quick Summary

Warrantless entry into a residence is reasonable under the emergency aid exception if officers have an objectively reasonable basis to believe medical assistance is needed or persons are in danger.

Police officers responded to a disturbance at a residence where they observed property damage, blood on a vehicle and door, and a man screaming and throwing objects inside. After the man refused to answer questions and demanded a warrant, an officer entered the home and was met by the man pointing a gun. The court considered whether the officer's warrantless entry was justified under the emergency aid exception. The Court held that the exception applies if officers have an objectively reasonable basis for believing a person inside needs immediate aid or is in danger of imminent injury. The officer's entry was reasonable because the chaotic scene and visible injuries provided an objective basis to believe someone required medical assistance or was being threatened.

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cited 8× by 7 distinct cases, 2022–2026 · 5 courts→ Stable · …an objectively reasonable basis for believing at p. 49 ✓ Topic ↗
1,422 citation events (1,422 in the last 25 years) across 112 distinct courts.
Strongest positive: State v. Mack (ohioctapp, 2025-10-21) · Strongest negative: Nicholas v. People (virginislands, 2012-06-06)
Treatment trajectory · 2010 → 2026 · click a year to view as-of
2010 2018 2026
Top citers, strongest first. 50 distinct citers. How cited ↗
discussed Cited "but see" Nicholas v. People (2×)
virginislands · 2012 · signal: but see · confidence high
But see Michigan v. Fisher, 558 U.S._, 130 S. Ct. 546, 548 , 175 L.
discussed Cited as authority (verbatim quote) State v. Mack
Ohio Ct. App. · 2025 · signal: see also · quote attribution · 1 verbatim quote · confidence high
officers do not need ironclad proof of a 'likely serious, life-threatening' injury to invoke the emergency aid exception.
discussed Cited as authority (verbatim quote) State of New Jersey v. Arthur Lomando
N.J. Super. Ct. App. Div. · 2025 · signal: see · quote attribution · 1 verbatim quote · confidence high
this 'emergency aid exception' does not depend on the officers' subjective intent or the seriousness of any crime they are investigating when the emergency arises.
examined Cited as authority (verbatim quote) Ryan Douglas Roberts v. Commonwealth of Virginia (2×) also: Cited "see, e.g."
Va. Ct. App. · 2024 · signal: see · quote attribution · 1 verbatim quote · confidence high
it sufficed to invoke the emergency aid exception that it was reasonable to believe that fisher had hurt himself (albeit nonfatally) and needed treatment that in his rage he was unable to provide, or that fisher was about to hurt, or had already hurt, someone else.
discussed Cited as authority (verbatim quote) Cannon v. Filip
N.D. Ill. · 2024 · quote attribution · 1 verbatim quote · confidence high
at the core of the privacy protected by the fourth amendment is the right to be let alone in one's house.
discussed Cited as authority (verbatim quote) United States v. Cameron Bryant
8th Cir. · 2024 · signal: see also · quote attribution · 1 verbatim quote · confidence high
searches and seizures inside a home without a warrant are presumptively unreasonable . . . .
examined Cited as authority (verbatim quote) Michael B. Brown v. Officer Robert Hooks (3×) also: Cited as authority (rule), Cited "see"
11th Cir. · 2024 · signal: see · quote attribution · 1 verbatim quote · confidence high
police officers saw that fisher had a cut on his hand, and they asked him whether he needed medical attention. fisher ig- nored these questions and demanded, with accompanying profan- ity, that the officers go to get a search warrant.
examined Cited as authority (verbatim quote) Sanford v. Kirst (9×) also: Cited as authority (rule), Cited "see"
M.D. La. · 2023 · quote attribution · 1 verbatim quote · confidence high
complaint of a disturbance
discussed Cited as authority (verbatim quote) Babcock v. Olson
S.D. Fla. · 2020 · quote attribution · 1 verbatim quote · confidence high
it does not meet the needs of law enforcement or the demands of public safety to require officers to walk away.
examined Cited as authority (verbatim quote) United States v. Billy Curry, Jr. (5×) also: Cited as authority (rule), Cited "see", Cited "see, e.g."
4th Cir. · 2020 · quote attribution · 1 verbatim quote · confidence high
we cannot afford to read the fourth amendment to require officers to wait . . . , and perhaps until innocent bystanders are physically harmed, before taking reasonable, preventive measures.
discussed Cited as authority (verbatim quote) Gay v. Cobb County, Georgia (2×) also: Cited as authority (rule)
N.D. Ga. · 2019 · quote attribution · 1 verbatim quote · confidence high
it does not meet the needs of law enforcement or the demands of public safety to require officers to walk away.
discussed Cited as authority (verbatim quote) United States v. Billy Curry, Jr. (2×) also: Cited "see, e.g."
4th Cir. · 2019 · quote attribution · 1 verbatim quote · confidence high
we cannot afford to read the fourth amendment to require officers to wait . . . , perhaps until innocent bystanders are physically harmed, before taking reasonable, preventive measures.
discussed Cited as authority (verbatim quote) Natasha Fineout v. Del Kostanko
6th Cir. · 2019 · quote attribution · 1 verbatim quote · confidence high
preventing imminent or ongoing physical abuse within a home qualifies as an exigent circumstance.
discussed Cited as authority (verbatim quote) Batt v. Buccilli (2×) also: Cited "see"
2d Cir. · 2018 · signal: see · quote attribution · 1 verbatim quote · confidence high
even a casual review of brigham city reveals that . . . officers do not need ironclad proof of 'a likely serious, life- threatening' injury to invoke the emergency aid exception.
examined Cited as authority (verbatim quote) James v. Chavez (17×) also: Cited "see"
unknown court · 2011 · signal: see · quote attribution · 1 verbatim quote · confidence high
it would be objectively reasonable to believe that fisher's projectiles might have a human target (perhaps a spouse or a child)....
examined Cited as authority (quoted) Commonwealth v. Wilmer, A., Aplt. (4×) also: Cited "see, e.g."
Pa. · 2018 · signal: see also · quote attribution · 3 verbatim quotes · confidence low
this emergency aid exception requires only an objectively reasonable basis for believing that a person within the house is in need of immediate aid.
examined Cited as authority (quoted) Commonwealth v. Qadir
Mass. App. Ct. · 2018 · signal: see · quote attribution · 1 verbatim quote · confidence high
officers do not need ironclad proof of "a likely serious, life-threatening" injury to invoke the emergency aid exception.' ... it suffices that there are objectively reasonable grounds to believe that emergency aid might be needed
examined Cited as authority (quoted) United States v. Loni Tepiew (5×) also: Cited "see, e.g."
7th Cir. · 2017 · signal: see also · quote attribution · 3 verbatim quotes · confidence low
at the core of the privacy protected by the fourth amendment is the right to be let alone in one's home.
examined Cited as authority (quoted) United States v. Pirouz Sedaghaty (4×) also: Cited "see"
9th Cir. · 2013 · signal: see · quote attribution · 3 verbatim quotes · confidence high
the ultimate touchstone of the fourth. amendment ... is 'reasonableness.
examined Cited as authority (quoted) State v. Tindall (6×) also: Cited "see"
S.C. · 2010 · quote attribution · 4 verbatim quotes · confidence low
the ultimate touchstone of the fourth amendment,' we have often said, is 'reasonableness.
discussed Cited as authority (rule) David J. Funaro, Jr. v. City of Glens Falls; Glens Falls Police Department; Hunter McKenna; Zachary Swartz
N.D.N.Y. · 2026 · confidence medium
Plaintiff does not allege any facts indicating that “a person within the house [was] in need of immediate aid.” Michigan v. Fisher, 558 U.S. 45, 47 (2009); compare United States v. Ashburn, No. 11-cr-303, 2014 WL 1800409 , at *5, 5 n.6 (E.D.N.Y.
cited Cited as authority (rule) Michael Moore v. Kenneth Finley, et al.
N.D. Ala. · 2026 · confidence medium
The Court explained that “[o]fficers do not need ironclad proof of a likely serious, life- threatening injury to invoke the emergency aid exception.” Id. at 49 (cleaned up).
discussed Cited as authority (rule) Anjie Hughes, Plaintiff, v. Muhlenberg Township Police Officer Malachi Schmidt, et al., Defendants.
E.D. Pa. · 2026 · confidence medium
“Brigham City identified one such exigency: ‘the need to assist persons who are seriously injured or threatened with such injury.’” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (quoting Brigham City, 547 U.S. at 403 ).
cited Cited as authority (rule) Case v. Montana
SCOTUS · 2026 · confidence medium
Three years later, in Michigan v. Fisher, we reiterated what we had said in Brigham City about the “emergency aid exception.” 558 U. S. 45, 47 (2009) (per curiam).
cited Cited as authority (rule) Thomas Warren v. John Jayne, Boise Police Department
D. Idaho · 2025 · confidence medium
“Officers do not need ironclad proof of ‘a likely serious, life-threatening’ injury to invoke the emergency aid exception.” Michigan v. Fisher, 558 U.S. 45, 49 (2009) (per curiam).
discussed Cited as authority (rule) United States v. Jackson (2×) also: Cited "see, e.g."
5th Cir. · 2025 · confidence medium
This “emergency aid exception” “requires only ‘an objectively reasonable basis for believing,’ . . . that ‘a person within [the house] is in need of immediate aid[.]’” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (citations omitted).
cited Cited as authority (rule) State v. Reynolds
Ohio Ct. App. · 2025 · confidence medium
Michigan v. Fisher, 558 U.S. 45, 49 (2009); Brigham City, Utah v. Stuart, 547 U.S. at 403-406 .
cited Cited as authority (rule) Bowen v. Sidney Police Department
S.D. Ohio · 2025 · confidence medium
No. 3. for “the officers’ subjective intent or the seriousness of any crime they are investigating[.]” Williams, 9 F.4th at 432 (quoting Mich. v. Fisher, 558 U.S. 45, 47 (2009) (per curiam)).
examined Cited as authority (rule) Morrison v. New York State Trooper Michael Strain (3×)
N.D.N.Y. · 2025 · confidence medium
“This ‘emergency aid exception’ does not depend on the officers’ subjective intent or the seriousness of any crime they are investigating when the emergency arises.” Michigan v. Fisher, 558 U.S. 45, 47 (2009); see also Stuart, 547 U.S. at 404 (“The officer’s subjective motivation is irrelevant.”).
examined Cited as authority (rule) Michael Hoover v. Justin Due (3×) also: Cited "see, e.g."
6th Cir. · 2025 · confidence medium
Determining whether exigent circumstances existed “does not depend on the officers’ subjective intent.” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (per curiam).
cited Cited as authority (rule) Green v. Kootenai County Sheriff's Office
D. Idaho · 2025 · confidence medium
“Officers do not need ironclad proof of ‘a likely serious, life-threatening’ injury to invoke the emergency aid exception.” Michigan v. Fisher, 558 U.S. 45, 49 (2009) (per curiam).
examined Cited as authority (rule) State v. Nathan Cooper (4×)
R.I. · 2025 · confidence medium
Fisher, 558 U.S. at 48.
discussed Cited as authority (rule) Alicea v. City of Bridgeport
2d Cir. · 2025 · confidence medium
Under the emergency aid exception to the warrant requirement, “law enforcement officers may enter a home without a warrant to render emergency assistance to an injured occupant or to protect an occupant from imminent injury.” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (internal quotation marks omitted).
discussed Cited as authority (rule) SALVADOR v. CITY OF UNION CITY
D.N.J. · 2025 · confidence medium
The emergency aid doctrine “does not depend on an officer’s subjective intent or the seriousness of any crime they are investigating when the emergency arises.” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (citing Mincey v. Arizona, 437 U.S. 385, 404-05 (1978)).
cited Cited as authority (rule) WASHINGTON v. THE CITY OF JERSEY CITY
D.N.J. · 2025 · confidence medium
Exigent circumstances can, however, and the need for emergency aid is “one such exigency.” Michigan v. Fisher, 558 U.S. 45, 47 (2009).
discussed Cited as authority (rule) CIACCIO v. UPPER SAUCON TOWNSHIP
E.D. Pa. · 2025 · confidence medium
Certainly, “law enforcement officers ‘may enter a home without a warrant to render emergency assistance to an injured occupant or to protect an occupant from imminent injury.’” , 558 U.S. 45, 47 (2009) (quotation omitted).
discussed Cited as authority (rule) Gary Rosales v. Gabriela Najera
9th Cir. · 2025 · signal: cf. · confidence medium
The exigent circumstances exception to the warrant requirement does not apply because the officers had no “objectively reasonable basis” for believing that there was any “need to assist persons who are seriously injured or threatened with such injury.” Brigham City v. Stuart, 547 U.S. 398, 403, 406 (2006); cf. Michigan v. Fisher, 558 U.S. 45, 48, 49 (2009) (per curiam) (finding “‘an objectively reasonable basis for believing’ that medical assistance was needed, or persons were in danger,” where 3 officers were responding to a report of a disturbance and found “a tumultuous si…
discussed Cited as authority (rule) Adamson v. City of Taylor
E.D. Mich. · 2025 · confidence medium
Risk of Danger / Emergency Aid Exception Though “‘[o]fficers do not need ironclad proof of a likely serious, life- threatening injury to invoke the emergency aid exception,’ . . . they must have an objectively reasonable basis for believing that ‘a person within the house is in need of immediate aid.’” Gradisher v. City of Akron, 794 F.3d 574, 584 (6th Cir. 2015) (quoting Michigan v. Fisher, 558 U.S. 45, 48 (2009)).
discussed Cited as authority (rule) Hershey 255571 v. Harwood
W.D. Mich. · 2025 · confidence medium
These circumstances mirror precisely those that the Supreme Court has held justify invoking the risk-of-danger exception: police officers’ “responding to a report of a disturbance” at a home and “see[ing] violent behavior inside.” Michigan v. Fisher, 558 U.S. 45, 48 (2009), quoted in Williams v. Maurer, 9 F.4th 416, 435 (6th Cir. 2021).
discussed Cited as authority (rule) Rattray v. Cadavid
S.D.N.Y. · 2025 · confidence medium
A search is reasonable under the Fourth Amendment[,] regardless of the individual officer’s state of mind, as long as the circumstances[,] viewed objectively[,] justify the search.” (Tr. 602; see also Brigham City, Utah v. Stuart, 547 U.S. 398, 404 (2006) (“An action is ‘reasonable’ under the Fourth Amendment, regardless of the individual officer’s state of mind, ‘as long as the circumstances, viewed objectively, justify [the] action.””) (quoting Scott v. United States, 436 U.S. 128, 138 (1978) (emphasis in Brigham City); Michigan v. Fisher, 558 U.S. 45, 49 (2009) (“the tes…
discussed Cited as authority (rule) Com. v. Fisher, J.
Pa. Super. Ct. · 2025 · confidence medium
The relevant question then becomes “whether there was ‘an objectively reasonable basis for believing’ that medical assistance was needed, or persons were in danger[.]” Michigan v. Fisher, 558 U.S. 45, 49 (2009).
cited Cited as authority (rule) United States of America v. José Luis Guerrero Nuñez, et al.
D.N.H. · 2025 · confidence medium
Therefore, “searches and seizures inside a home without a [search] warrant are presumptively unreasonable.” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (quotations omitted).
discussed Cited as authority (rule) Tedor Davido v. Secretary Pennsylvania Department of Corrections
3rd Cir. · 2025 · confidence medium
This “emergency aid exception” applies if there is “an objectively reasonable basis for believing,” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (per curiam) (quoting Brigham City, 547 U.S. at 402, 406 ), “that ‘a person within [the house] is in need of immediate aid,’” id. (alteration in original) (quoting Mincey, 437 U.S. at 392 ).
cited Cited as authority (rule) Brown v. Laddner
E.D. Ark. · 2025 · confidence medium
Shultz v. Buchanan, 829 F.3d 943, 949 (8th Cir. 2016) (citing Michigan v. Fisher, 558 U.S. 45, 47 (2009)).
discussed Cited as authority (rule) State v. Anthony Donte Dixon
Wis. Ct. App. · 2025 · confidence medium
The officers “[did] not need ironclad proof of ‘a likely serious, life-threatening’ injury[.]” Michigan v. Fisher, 558 U.S. 45, 49 (2009). ¶25 Therefore, under the totality of the circumstances, we conclude that the officers’ entry and sweep was justified under the emergency aid doctrine and affirm.
examined Cited as authority (rule) United States v. Giambro (6×) also: Cited "see"
1st Cir. · 2025 · confidence medium
"Thus, law enforcement officers 'may enter a home without a warrant to render emergency assistance to an injured occupant or to protect an occupant from imminent injury.'" Michigan v. Fisher, 558 U.S. 45, 47 (2009) (quoting Brigham City, 547 U.S. at 403 ). - 14 - To justify warrantless entry under the emergency aid exception, it is the government's burden to establish an "'objectively reasonable basis for believing' that 'a person within [the house] is in need of immediate aid.'" Id. (first quoting Brigham City, 547 U.S. at 406 ; and then quoting Mincey, 437 U.S. at 392 ).7 The government must…
discussed Cited as authority (rule) Wheelock v. Nitzschke
N.D. Iowa · 2024 · confidence medium
This exigency can justify a warrantless entry if officers have an “objectively reasonable basis for believing . . . that a person within the house is in need of immediate aid . . . .” Michigan v. Fisher, 558 U.S. 45, 47 (2009) (per curiam).
discussed Cited as authority (rule) United States v. Staff Sergeant DAVID K. MYERS
A.C.C.A. · 2024 · confidence medium
Among other circumstances, the emergency aid exception applies to situations where law enforcement has an “‘. . . objectively reasonable basis for believing’... that a ‘person within the house is in need of immediate aid.’” Michigan v. Fisher, 558 U.S. 45, 47 (2006) (citations omitted).
discussed Cited as authority (rule) Hoover v. Due
M.D. Tenn. · 2024 · confidence medium
The “‘emergency aid exception’ does not depend on the officers’ subjective intent or the seriousness of any crime they are investigating when the emergency arises.” Michigan v. Fisher, 558 U.S. 45, 47 (2009).
cited Cited as authority (rule) State v. Michael Gene Wiskowski
Wis. · 2024 · confidence medium
See Kentucky v. King, 563 U.S. 452, 460 (2011); Michigan v. Fisher, 558 U.S. 45, 47 (2009) (per curiam).
Retrieving the full opinion text from the archive…
Michigan
v.
Fisher
09-91.
Supreme Court of the United States.
Dec 7, 2009.
558 U.S. 45
2009 U.S. LEXIS 8773

Lead Opinion

Per Curiam.

Police officers responded to a complaint of a disturbance near Allen Road in Brownstown, Michigan.* Officer Christopher Goolsby later testified that, as he and his partner approached the area, a couple directed them to a residence where a man was “going crazy.” Docket No. 276439, 2008 WL 786515, *1 (Mich. App., Mar. 25, 2008) (per curiam) (alteration and internal quotation marks omitted). Upon their arrival, the officers found a household in considerable chaos: a pickup truck in the driveway with its front smashed, damaged fenceposts along the side of the property, and three[*46] broken house windows, the glass still on the ground outside. The officers also noticed blood on the hood of the pickup and on clothes inside of it, as well as on one of the doors to the house. (It is disputed whether they noticed this immediately upon reaching the house, but undisputed that they noticed it before the allegedly unconstitutional entry.) Through a window, the officers could see respondent, Jeremy Fisher, inside the house, screaming and throwing things. The back door was locked, and a couch had been placed to block the front door.

The officers knocked, but Fisher refused to answer. They saw that Fisher had a cut on his hand, and they asked him whether he needed medical attention. Fisher ignored these questions and demanded, with accompanying profanity, that the officers go to get a search warrant. Officer Goolsby then pushed the front door partway open and ventured into the house. Through the window of the open door he saw Fisher pointing a long gun at him. Officer Goolsby withdrew.

Fisher was charged under Michigan law with assault with a dangerous weapon and possession of a firearm during the commission of a felony. The trial court concluded that Officer Goolsby violated the Fourth Amendment when he entered Fisher’s house, and granted Fisher’s motion to suppress the evidence obtained as a result — that is, Officer Goolsby’s statement that Fisher pointed a rifle at him. The Michigan Court of Appeals initially remanded for an evidentiary hearing, see Docket No. 256027, 2005 WL 3481454 (Dec. 20, 2005) (per curiam), after which the trial court reinstated its order. The Court of Appeals then affirmed over a dissent by Judge Talbot. See 2008 WL 786515, at *2; id., at *2-*5. The Michigan Supreme Court granted leave to appeal, but, after hearing oral argument, it vacated its prior order and denied leave instead; three justices, however, would have taken the case and reversed on the ground that the Court of Appeals misapplied the Fourth Amendment.[*47] See 483 Mich. 1007, 765 N. W. 2d 19 (2009). Because the decision of the Michigan Court of Appeals is indeed contrary to our Fourth Amendment ease law, particularly Brigham City v. Stuart, 547 U. S. 398 (2006), we grant the State’s petition for certiorari and reverse.

“[T]he ultimate touchstone of the Fourth Amendment,” we have often said, “is ‘reasonableness.’ ” Id., at 403. Therefore, although “searches and seizures inside a home without a warrant are presumptively unreasonable,” Groh v. Ramirez, 540 U. S. 551, 559 (2004) (internal quotation marks omitted), that presumption can be overcome. For example, “the exigencies of the situation [may] make the needs of law enforcement so compelling that the warrantless search is objectively reasonable.” Mincey v. Arizona, 437 U. S. 385, 393-394 (1978) (internal quotation marks omitted).

Brigham City identified one such exigency: “the need to assist persons who are seriously injured or threatened with such injury.” 547 U. S., at 403. Thus, law enforcement officers “may enter a home without a warrant to render emergency assistance to an injured occupant or to protect an occupant from imminent injury.” Ibid. This “emergency aid exception” does not depend on the officers’ subjective intent or the seriousness of any crime they are investigating when the emergency arises. Id., at 404-405. It requires only “an objectively reasonable basis for believing,” id., at 406, that “a person within [the house] is in need of immediate aid,” Mincey, supra, at 392.

Brigham City illustrates the application of this standard. There, police officers responded to a noise complaint in the early hours of the morning. “As they approached the house, they could hear from within an altercation occurring, some kind of fight.” 547 U. S., at 406 (internal quotation marks omitted). Following the tumult to the back of the house whence it came, the officers saw juveniles drinking beer in the backyard and a fight unfolding in the kitchen. They[*48] watched through the window as a juvenile broke free from the adults restraining him and punched another adult in the face, who recoiled to the sink, spitting blood. Ibid. Under these circumstances, we found it “plainly reasonable” for the officers to enter the house and quell the violence, for they had “an objectively reasonable basis for believing both that the injured adult might need help and that the violence in the kitchen was just beginning.” Ibid.

A straightforward application of the emergency aid exception, as in Brigham, City, dictates that the officer’s entry was reasonable. Just as in Brigham City, the police officers here were responding to a report of a disturbance. Just as in Brigham City, when they arrived on the scene they encountered a tumultuous situation in the house — and here they also found signs of a recent injury, perhaps from a car accident, outside. And just as in Brigham City, the officers could see violent behavior inside. Although Officer Goolsby and his partner did not see punches thrown, as did the officers in Brigham City, they did see Fisher screaming and throwing things. It would be objectively reasonable to believe that Fisher’s projectiles might have a human target (perhaps a spouse or a child), or that Fisher would hurt himself in the course of his rage. In short, we find it as plain here as we did in Brigham City that the officer’s entry was reasonable under the Fourth Amendment.

The Michigan Court of Appeals, however, thought the situation “did not rise to a level of emergency justifying the warrantless intrusion into a residence.” 2008 WL 786515, at *2. Although the Court of Appeals conceded that “there was evidence an injured person was on the premises,” it found it significant that “the mere drops of blood did not signal a likely serious, life-threatening injury.” Ibid. The court added that the cut Officer Goolsby observed on Fisher’s hand “likely explained the trail of blood” and that Fisher “was very much on his feet and apparently able to see to his own needs.” Ibid.

[*49] Even a casual review of Brigham City reveals the flaw in this reasoning. Officers do not need ironclad proof of “a likely serious, life-threatening” injury to invoke the emergency aid exception. The only injury police could confirm in Brigham City was the bloody lip they saw the juvenile inflict upon the adult. Fisher argues that the officers here could not have been motivated by a perceived need to provide medical assistance, since they never summoned emergency medical personnel. This would have no bearing, of course, upon their need to ensure that Fisher was not endangering someone else in the house. Moreover, even if the failure to summon medical personnel conclusively established that Goolsby did not subjectively believe, when he entered the house, that Fisher or someone else was seriously injured (which is doubtful), the test, as we have said, is not what Goolsby believed, but whether there was “an objectively reasonable basis for believing” that medical assistance was needed, or persons were in danger, Brigham City, supra, at 406; Mincey, supra, at 392.

It was error for the Michigan Court of Appeals to replace that objective inquiry into appearances with its hindsight determination that there was in fact no emergency. It does not meet the needs of law enforcement or the demands of public safety to require officers to walk away from a situation like the one they encountered here. Only when an apparent threat has become an actual harm can officers rule out innocuous explanations for ominous circumstances. But “[t]he role of a peace officer includes preventing violence and restoring order, not simply rendering first aid to casualties.” Brigham City, supra, at 406. It sufficed to invoke the emergency aid exception that it was reasonable to believe that Fisher had hurt himself (albeit nonfatally) and needed treatment that in his rage he was unable to provide, or that Fisher was about to hurt, or had already hurt, someone else. The Michigan Court of Appeals required more than what the Fourth Amendment demands.

[*50] * * *

The petition for certiorari is granted. The judgment of the Michigan Court of Appeals is reversed, and the ease is remanded for further proceedings not inconsistent with this opinion.

It is so ordered.

We have taken the facts from the opinion of the Michigan Court of Appeals. Except where indicated, the parties do not dispute the facts.

Dissent

Justice Stevens,

with whom Justice Sotomayor joins, dissenting.

On October 31, 2003, Jeremy Fisher pointed a rifle at Officer Christopher Goolsby when Goolsby attempted to force his way into Fisher’s home without a warrant. Fisher was charged with assault with a dangerous weapon and possession of a dangerous weapon during the commission of a felony. The charges were dismissed after the trial judge granted a motion to suppress evidence of the assault because it was the product of Goolsby’s unlawful entry. In 2005 the Michigan Court of Appeals held that the trial court had erred because it had decided the suppression motion without conducting a full evidentiary hearing. On remand, the trial court conducted such a hearing and again granted the motion to suppress.

As a matter of Michigan law it is well settled that police officers may enter a home without a warrant “when they reasonably believe that a person within is in need of immediate aid.” People v. Davis, 442 Mich. 1, 25, 497 N. W. 2d 910, 921 (1993). We have stated the rule in the same way under federal law, Mincey v. Arizona, 437 U. S. 385, 392 (1978), and have explained that a warrantless entry is justified by the “ 'need to protect or preserve life or avoid serious injury,’ ” ibid. The State bears the burden of proof on that factual issue and relied entirely on the testimony of Officer Goolsby in its attempt to carry that burden. Since three years had passed, Goolsby was not sure about certain facts — such as whether Fisher had a cut on his hand — but he did remember that Fisher repeatedly swore at the officers and told them to[*51] get a warrant, and that Fisher was screaming and throwing things. Goolsby also testified that he saw “mere drops” of blood outside Fisher’s home, No. 276439, 2008 WL 786515, *2 (Mich. App., Mar. 25, 2008) (per curiam) (summarizing Goolsby’s testimony), and that he did not ask whether anyone else was inside. Goolsby did not testify that he had any reason to believe that anyone else was in the house. Thus, the factual question was whether Goolsby had “an objectively reasonable basis for believing that [Fisher was] seriously injured or imminently threatened with such injury.” Brigham City v. Stuart, 547 U. S. 398, 400 (2006).

After hearing the testimony, the trial judge was “even more convinced” that the entry was unlawful. Tr. 29 (Dec. 19, 2006). He noted the issue was “whether or not there was a reasonable basis to [enter the house] or whether [Goolsby] was just acting on some possibilities,” id., at 22, and evidently found the record supported the latter rather than the former. He found the police decision to leave the scene and not return for several hours — without resolving any potentially dangerous situation and without calling for medical assistance — inconsistent with a reasonable belief that Fisher was in need of immediate aid. In sum, the one judge who heard Officer Goolsby’s testimony was not persuaded that Goolsby had an objectively reasonable basis for believing that entering Fisher’s home was necessary to avoid serious injury.

The Michigan Court of Appeals affirmed, concluding that the State had not met its burden. Perhaps because one judge dissented, the Michigan Supreme Court initially granted an application for leave to appeal. After considering briefs and oral argument, however, the majority of that Court vacated its earlier order because it was “no longer persuaded that the questions presented should be reviewed by this Court.” 483 Mich. 1007, 765 N. W. 2d 19 (2009).

Today, without having heard Officer Goolsby’s testimony, this Court decides that the trial judge got it wrong. I am[*52] not persuaded that he did, hut even if we make that assumption, it is hard to see how the Court is justified in micromanaging the day-to-day business of state tribunals making fact-intensive decisions of this kind. We ought not usurp the role of the factfinder when faced with a close question of the reasonableness of an officer’s actions, particularly in a case tried in a state court. I therefore respectfully dissent.