OPINION
On July 29, 1991, at approximately 11:30 p.m., Hennepin County Deputy Sheriff Brian Fragodt and Officer Paul Schutte, of the Corcoran Police Department, responded to a prowler call. No prowlers were found at the scene, but the officers located two 13-year-old boys approximately one half mile away. The boys admitted they were outside the home in question, and were driven by the officers to the home of Gregory and Deborah Franzen, parents of one of the boys.
Later that same evening, at 1:51 a.m., another prowler call was made by the same household. Fragodt responded with Henne-pin County Deputy Sheriff Curt Roberts. Although no prowlers were found at the scene, Fragodt suspected the two boys had returned to the residence. While driving toward the Franzen home, Fragodt instructed a dispatcher to call the Franzen house. The dispatcher’s call reached an answering-machine.
■ When the deputies reached the Franzen home, they found it dark, with several cars parked outside, one with a warm engine. After knocking on the front porch door, the deputies noticed the porch door was unlocked and the interior French glass doors were open. At that time, the temperature was approximately 60 degrees outside. The deputies then walked into the attached porch and knocked on the open French doors. They announced their presence loudly as the Hennepin County Sheriffs Department. Getting no response, they yelled the same message two or three additional times. Still receiving no response, they took two or three steps into the kitchen, yelled again, and received no response. After repeated announcements with no response, the deputies proceeded upstairs where they encountered Mr. and Mrs. Franzen.
The deputies explained there had been an earlier prowler complaint and that the Fran-zen’s son had admitted to being near the complaining home. The deputies further explained they thought the Franzen boy might have been out again near the same house and they had come to the Franzen’s home with the intention of talking with him. After seeing the open door, they claim they decided to check and see if everything was all right. With the Franzens’ consent, the deputies confirmed the Franzen boy was at home asleep and his shoes were not damp. After apologizing for the inconvenience, the deputies left.
The Franzens filed a complaint with the Sheriffs department and an internal investigation ensued resulting in the Sheriff suspending the deputies without pay for violating the Fourth Amendment and consequently *824 the department rules and regulations. 1 The deputies’ union, respondent, Law Enforcement Labor Services, Inc., Local No. 19, appealed the Sheriffs decision and demanded binding arbitration pursuant to a collective bargaining agreement. The parties submitted the following issue to the arbitrator:
Was the discipline received by deputies Fragodt and Roberts for just cause as required by Article XXXIV?
The arbitrator determined: “the deputies had exigent circumstances to enter the Fran-zen house. There was no violation of the Franzen’s Fourth Amendment rights, nor any Sheriffs Department Manual of Rules and Regulations.” Thus, “[the sheriff] clear 7 ly did not have just cause to discipline the deputies.”
Appellant, Hennepin County, sought to vacate the arbitration award on the grounds that the arbitrator exceeded his authority by ruling on an issue of constitutional law, and that if not vacated, the arbitrator’s erroneous Fourth Amendment determination would have a deleterious effect on the Sheriffs ability to perform his duties. The trial court denied the County’s motion to vacate and the court of appeals affirmed the trial court’s judgment. On appeal to this court, the County contends the arbitrator exceeded his authority by deciding a constitutional issue. We agree and reverse the judgment of the court of appeals. Because we reverse on the basis that the arbitrator exceeded his authority, we decline to address appellant’s additional arguments for reversal.
A reviewing court must independently determine the scope of the arbitrator’s authority de novo.
Minnesota Educ. Ass’n v. Independent Sch. Dist. No. 495,
The scope of an arbitrator’s authority is a matter of contract interpretation to be determined from a reading of the parties’ arbitration agreement.
Ramsey County v. AFSCME, Local 8,
While not disputing the well settled rules used to determine the scope of an arbitrator’s authority, appellant argues Minnesota law is clear: an arbitrator lacks the authority to decide constitutional issues. We agree that in the public sector an arbitrator lacks the authority to decide constitutional issues.
We first indicated an arbitrator “does not have the authority to make determinations concerning the constitution” in
City of Richfield v. Local No. 1215, International Ass’n of Fire Fighters,
On appeal to this court, the guards contended the arbitration should have been stayed pending the result of the district
*825
court’s constitutional determination.
Id.
at 441. We rejected the guards’ argument, and instead adopted the administrative law rule that requires a party to exhaust its contract remedies prior to litigation unless a clear and unambiguous violation of the complaining party’s constitutional rights is alleged.
Id.
at 441 (citing
E. I. DuPont de Nemours & Co. v. F.T.C.,
The fact that we decline to interfere with the arbitration process does not confer upon the arbitrator the right to decide constitutional issues. We have already indicated that arbitrators are without such authority in Minnesota. See City of Richfield v. Local No. 1215, Etc.,276 N.W.2d 42 , 51 (Minn.1979). We now expressly hold this to be the rule in Minnesota irrespective of the language of the arbitration agreement. In the normal case, where the constitutional violations alleged are of a general nature, the arbitrator is to proceed. The alleged constitutional violations may be raised at the time of judicial review of the arbitration determination.
Id. at 442.
McGrath essentially centers on the issue of ripeness. If the constitutional claim is clear and unambiguous, a party may present the constitutional issues to a court immediately. However, if the constitutional claim is of a general nature, then the party must wait until after the grievance proceeding is exhausted to commence litigation. The McGrath decision further states, in unequivocal language, that in neither case may an arbitrator decide a constitutional issue.
We reaffirm our holdings in
City of Richfield
and
McGrath
and again hold that in the public sector an arbitrator has no authority to make constitutional determinations, irrespective of the language of the arbitration agreement. Moreover, neither the holdings in
City of Richfield, McGrath,
nor this case suggest that a reviewing court should “review an arbitrator’s decision for constitutional error”
New Creative Enter. v. Dick Hume & Assoc.,
In the present case, therefore, in accordance with Richfield and McGrath, we hold the arbitrator erred in making the Fourth Amendment determination. The issue should have been brought to the district court for determination. Although it was not brought to the trial court immediately, because the trial court and court of appeals have reviewed the validity of the deputies’ warrantless entry, this court may now review this determination.
Under the Fourth Amendment to the United States Constitution and Art. I, § 10 of the Minnesota Constitution, “[w]ar-rantless entries and searches inside one’s home are presumptively unreasonable.”
Payton v. New York,
*826
In this case, the trial court cited the emergency exception to support its determination that the officers had not violated the Fourth Amendment. Under the emergency exception the police may enter a home without a warrant if they reasonably believe that a person within is in need of immediate aid.
See e.g., State v. Othoudt,
In
State v. Anderson,
In
State v. Halla-Poe,
In contrast, in
United States v. Selberg,
The deputies based their warrant-less entry into the Franzen home on the following facts: 1) one unresolved prowler call had occurred, 2) a telephone call made shortly before the deputies arrived was answered by a machine, not a person, 3) the house was dark, 4) one of several cars in the driveway was warm, 5) the temperature was about 60 degrees, the porch door was unlocked, and the interior French doors were open, and 6) no one responded to their shouts and knocks.
In this cáse, the facts the deputies had before them pale in comparison to the circumstances in those rare cases where the emergency exception does justify a warrant-less entry into a home. Accordingly, we hold the circumstances preceding the deputies’ warrantless entry into the Franzen’s home did not objectively demonstrate a person inside the home was in need of immediate assistance; thus, exigent circumstances did not justify a warrantless search and the deputies violated the Fourth Amendment.
Reversed and remanded to the arbitrator, for a determination, in accordance with this *827 decision, of whether the sheriffs department had “just cause” to discipline the deputies.
Notes
. The Sheriffs department rules and regulations essentially provide that if a deputy violates a law, she ill turn violates a departmental rule or regulation.
