Searches, seizures, and warrants
Protects against unreasonable government searches and seizures and sets requirements for warrants.
In Simple, Modern English
People must be secure in their bodies, homes, papers, and belongings against unreasonable searches or seizures. A warrant needs probable cause supported by an oath or affirmation, and must specifically identify the place to search and the people or things to seize.
Important Clauses & Details
Reasonableness
A search or seizure must satisfy constitutional standards. Seizures can involve a person, such as an arrest, or property.
Probable cause and particularity
A warrant requires a supported factual basis and a specific scope. Officials cannot simply seek permission to search everyone and everything.
Mapp v. Ohio (1961) and the exclusionary rule
Mapp v. Ohio (1961) applied the Fourth Amendment exclusionary rule to state criminal proceedings through the Fourteenth Amendment. Evidence obtained through unconstitutional searches or seizures is generally excluded from the prosecution’s case, subject to recognized exceptions. The rule seeks to deter unlawful police conduct. Read the source.
Why It Was Added
British general warrants and writs of assistance allowed broad searches with little individualized justification. The amendment rejects that kind of open-ended government authority.
Not every lawful search requires a warrant: recognized exceptions exist. Probable cause does not mean proof beyond a reasonable doubt.
Plain-English study paraphrases summarize the text; they are not verbatim translations. Historical provisions and later changes are identified above. Sources: National Archives and Constitution Annotated.