About the expectation itself, the Supreme Court has explained that what "a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection. But what he seeks to preserve as private, even in an area accessible to the public, may be constitutionally protected."
The people shall be secure in their persons, houses, papers and possessions from unreasonable searches and seizures, and no warrant to search any place or to seize any person or things shall issue without describing them as nearly as may be, nor without probable cause, supported by oath or affirmation subscribed to by ...
The Fourth Amendment is very brief. Despite its importance, it's only one sentence long. It has two clauses: the "unreasonable search and seizure" clause and the "warrants" clause.
For the belief that the law was being violated on the premises to be searched; and if the apparent facts set out in the affidavit are such that a reasonably discreet and prudent man would be led to believe that there was a commission of the offense charged, there is probable cause justifying the issuance of a warrant.
The Constitution, through the Fourth Amendment, protects people from unreasonable searches and seizures by the government. The Fourth Amendment, however, is not a guarantee against all searches and seizures, but only those that are deemed unreasonable under the law.
“The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things ...
Amendments: In-text citation: (U.S. Const. amend. IV). OR Amendment IV of the U.S. Constitution ... In-text example: The U.S. Constitution protects people from unreasonable searches by the government (U.S. Const. amend. IV).
Amendments: In-text citation: (U.S. Const. amend. IV). OR Amendment IV of the U.S. Constitution ... In-text example: The U.S. Constitution protects people from unreasonable searches by the government (U.S. Const. amend. IV).
All searches and seizures under the Fourth Amendment must be reasonable and no excessive force shall be used. Reasonableness is the ultimate measure of the constitutionality of a search or seizure. Searches and seizures with the warrant must also satisfy the reasonableness requirement.
An amendment may be proposed by a two-thirds vote of both Houses of Congress, or, if two-thirds of the States request one, by a convention called for that purpose. The amendment must then be ratified by three-fourths of the State legislatures, or three-fourths of conventions called in each State for ratification.