Whether the Fourth Amendment permits police, absent consent or exigent circumstances, to enter a suspect's own home without a warrant to make a routine felony arrest.
Holding
No. The Fourth Amendment prohibits a warrantless and nonconsensual entry into a suspect's home to make a routine felony arrest, absent exigent circumstances.
Reasoning
The Court began with the Fourth Amendment's protection against unreasonable searches and seizures. An arrest is plainly a seizure of a person, and the Amendment applies to seizures of persons just as it applies to seizures of property. The established rule is that searches and seizures inside a home without a warrant are presumptively unreasonable unless a recognized exception, such as exigent circumstances, applies.
The home receives the Amendment's most forceful protection. A public arrest on probable cause may be reasonable without a warrant, as United States v. Watson held, but crossing a home's threshold creates an additional and distinct invasion: intrusion into the resident's private dwelling. The Court described that threshold as a firm constitutional line that police ordinarily may not cross without a warrant.
New York argued that arrest entries are less intrusive than searches for evidence because an arrest does not necessarily entail rummaging through possessions. The Court rejected that distinction as insufficient. An officer entering to arrest may have to search the residence for the suspect, and, in any event, both an arrest entry and a search entry share the central intrusion—the breach of the home's entrance. Any difference between the two is one of degree, not constitutional kind.
History did not establish a settled common-law rule authorizing the warrantless home arrests at issue. The common-law sources were divided, and influential authorities, including Coke, treated a warrantless forced entry with substantial skepticism. The historical materials instead reflected a deep and repeated commitment to the principle that a person's home is his or her castle.
The state-law practice and federal legislation cited by New York did not supply the strong historical and legislative consensus that had supported warrantless public felony arrests in Watson. States were divided, with a recent trend toward requiring warrants for home arrests, and no federal statute clearly expressed a congressional judgment that warrantless entries into homes to make routine arrests were reasonable.
The Court did not decide whether exigent circumstances could have justified the officers' entries, because the New York courts treated both cases as routine arrests in which there was time to obtain warrants. It also did not address entry into a third party's home, the quantum of proof needed to believe a suspect is present, or entries made with an occupant's consent.