Whether the Fourth and Fourteenth Amendments permit a broad warrantless search of a homicide scene simply because a homicide has occurred there.
Holding
No. The seriousness of a homicide does not itself create a categorical “murder scene” exception to the Fourth Amendment's warrant requirement.
Reasoning
The Fourth Amendment generally treats searches conducted without prior judicial authorization as unreasonable, subject only to established and carefully defined exceptions. Arizona did not rely on an existing exception; instead, it asked the Court to recognize a new exception whenever police investigate a homicide scene. The Court held that the State had not carried its burden to justify that departure from the warrant requirement.
Mincey did not forfeit his privacy interest in his apartment merely because he allegedly shot an officer. Treating the alleged crime as a waiver of privacy would effectively presume the suspect's guilt before police had obtained the evidence. Nor did the lawful police entry and arrest make the later, far more invasive four-day examination of Mincey's entire home constitutionally insignificant.
Police may enter and conduct a prompt warrantless search when they reasonably believe someone needs immediate aid. At a homicide scene, they may quickly look for other victims or a dangerous assailant still present, and they may seize evidence in plain view while carrying out those emergency functions. But the scope of any emergency search must be strictly limited by the emergency that justified it.
No continuing emergency supported the detectives' four-day search. Before the homicide detectives began their investigation, officers had already located all persons in the apartment, summoned medical assistance, and secured the premises. Opening drawers and closets, emptying clothing pockets, removing carpet, and examining every item in the apartment went far beyond locating victims or neutralizing a threat.
The public has a powerful interest in investigating murder, but that interest does not distinguish homicide in a constitutionally workable way from other serious crimes such as rape, robbery, or burglary. Greater investigative efficiency alone cannot justify dispensing with warrants, especially when police had secured the apartment, faced no apparent danger that evidence would be lost, and could readily have sought a warrant.
Arizona's purported limits on the exception—such as a “reasonable” search begun within a “reasonable” time to determine the circumstances of death—left too much discretionary judgment to officers. The Fourth Amendment assigns the initial assessment of the proper scope of a substantial evidentiary search to a neutral magistrate, not to officers engaged in investigating crime. The Court left for Arizona courts on remand the question whether any particular evidence was lawfully seized under established Fourth Amendment doctrines.