Ker v. California
The Court upheld the marijuana convictions of a husband and wife, ruling that police who quietly let themselves into their apartment with a passkey, without knocking or announcing themselves, still acted reasonably under the Fourth Amendment given the urgency of the situation.
The decision also made clear that the constitutional rule requiring states to exclude illegally seized evidence, announced two years earlier in Mapp v. Ohio, uses the exact same reasonableness standard that applies to federal officers -- but the Court split 5-4 on how that standard applied to these facts.
How it got here: A California appeals court affirmed the convictions and rejected the Fourth Amendment challenge; the state's highest court declined review, and the Supreme Court granted certiorari.
The Case in Depth
What happened
Los Angeles County deputies investigating a marijuana operation tracked a suspected supplier named Murphy and observed him meet briefly with George Ker near an oil field. Combined with a reliable informant's tips that Ker sold marijuana from his apartment, officers used a passkey to quietly enter the Kers' apartment that night, arrested George and his wife Diane, and found marijuana on the kitchen counter and elsewhere, which was used to convict both of possession.
The question before the Court
After officers let themselves into a married couple's apartment with a passkey and no warning to arrest them for marijuana possession, was that unannounced entry and the search that followed still constitutionally reasonable?
The Court's answer
Yes -- the Court ruled that the officers' warrantless, unannounced entry into the apartment and the search that followed were constitutionally reasonable. The officers had probable cause to arrest George Ker based on his meeting with a known drug dealer and a reliable informant's tips, and California's exception allowing entry without knocking -- when officers reasonably fear evidence might be destroyed -- did not violate the Fourth Amendment on these facts.
The Court also held that the search of the apartment, which turned up more marijuana, was lawful as incident to that valid arrest, and that spotting a marijuana brick through an open kitchen doorway was not even a "search" since it was in plain view. Four justices dissented, agreeing that the same constitutional standard applies to states and the federal government but disagreeing that the unannounced entry itself was reasonable.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
The ruling told police departments nationwide that entering a home without knocking or announcing their purpose can be lawful when officers reasonably believe evidence like narcotics might otherwise be destroyed. It also confirmed that state and federal searches are now judged by one uniform constitutional yardstick, shaping how state courts across the country handle suppression motions after Mapp.
What changes now
This is a final merits decision, so the convictions stand and no further proceedings are required in this case. The ruling establishes that state searches and seizures are judged under the identical constitutional reasonableness standard as federal ones, meaning future state suppression disputes will be litigated under uniform Fourth Amendment principles, while individual questions about unannounced entries continue to be resolved case-by-case based on the specific facts.
What this does not decide
The Court did not decide whether the search of Diane Ker's car, conducted a day after her arrest, was lawful, because that issue was not properly raised in the lower courts or in the certiorari petition. The ruling is also limited to the specific facts here and does not establish a general rule that unannounced entries are always permissible.
Concurrences and dissents
Concurrence — Justice Harlan
Justice Harlan agreed the convictions should stand but rejected the majority's holding that state searches must now be judged by the identical constitutional standards as federal searches. He would have continued judging state searches under the more flexible 'fundamental fairness' concept embedded in the Fourteenth Amendment's Due Process Clause, arguing the majority's approach unwisely straitjackets the states.
Dissent — Justice Brennan
“the unannounced intrusion of the arresting officers into their apartment violated the Fourth Amendment”Brennan's central objection that the police entry itself was unconstitutional despite probable cause.
Justice Brennan, joined by three others, agreed with the majority's Part I holding that the same constitutional standard governs federal and state searches, but argued the officers' unannounced, nighttime entry into the Kers' apartment violated the Fourth Amendment even though probable cause for arrest existed. He would have excluded the evidence because there was no proof the Kers knew police were outside or were destroying evidence, so none of the recognized exceptions to the knock-and-announce requirement applied.
How the Court got there
The legal reasoning, step by step
- The Court applied the probable-cause standard for warrantless arrests -- whether the facts known to officers would warrant a reasonable, cautious person's belief that a crime was being committed -- and found that Murphy's meeting with Ker plus a reliable informant's tips about Ker's drug dealing satisfied it.
- Because the arrest depended on entering the home, the Court examined whether the officers' quiet, unannounced entry using a passkey (rather than knocking and explaining their purpose, as California's break-in statute normally required) still met Fourth Amendment reasonableness.
- The Court held that California's judicially recognized exception to its notice statute -- allowing unannounced entry when notice would let a suspect destroy evidence -- did not itself violate the Constitution, given the officers' reasonable belief that marijuana could be quickly destroyed and Ker's evasive driving suggested he might expect police.
- Having found the entry reasonable, the Court applied the established rule that a warrantless search is valid when it is incident to a lawful arrest, and concluded the search of the apartment for narcotics fell within that doctrine because it followed directly from a lawful arrest based on probable cause.
- The Court also held that spotting the marijuana brick in plain view through an open kitchen doorway was not a 'search' at all, since the officer did not enter the room before making that observation.
Doctrinal impact
Cases affected by this decision
Reaffirms Mapp v. Ohio (367 U.S. 643)
The Court applies and elaborates on Mapp's rule that states must exclude illegally seized evidence under the same Fourth Amendment standard as federal courts.
Distinguishes Miller v. United States (357 U.S. 301)
The Court found this federal notice-statute case inapplicable because California law, unlike D.C. law, has an exigent-circumstances exception.
Distinguishes Trupiano v. United States (334 U.S. 699)
Unlike agents who had weeks to get a warrant in Trupiano, the officers here faced urgent, fast-moving circumstances.
Reaffirms Draper v. United States (358 U.S. 307)
The Court relies on Draper's rule that corroborated informant tips can establish probable cause for a warrantless arrest.