
The Fourth Amendment to the US Constitution, ratified on December 15, 1791, protects the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures. This amendment was established to protect people's privacy and freedom from unreasonable intrusions by the government, specifically prohibiting the use of general warrants, which had previously authorized officials to search and seize without probable cause. The Fourth Amendment has been the basis for numerous court cases and continues to be a relevant and important topic in the modern world, especially with the rise of new technologies and methods of surveillance.
| Characteristics | Values |
|---|---|
| Purpose | To protect people’s right to privacy and freedom from unreasonable intrusions by the government |
| Protection | Applies to all, whether accused of a crime or not |
| Scope | People, their persons, houses, papers, and effects |
| Search and seizure | Must be reasonable, with no excessive force used |
| Warrants | Only issued upon probable cause, supported by oath or affirmation, and describing the place to be searched and the persons or things to be seized |
| Exclusionary rule | Evidence obtained through unreasonable search and seizure may be ruled inadmissible in court |
| Exceptions | Probationers and parolees may have limited Fourth Amendment rights |
| Modern challenges | Balancing privacy rights with national security interests in the context of mass surveillance |
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What You'll Learn

The right to privacy
The Fourth Amendment of the U.S. Constitution is a constitutional right that protects the right to privacy and freedom from unreasonable intrusions by the government. The amendment states that:
> "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 to be seized."
The Fourth Amendment was ratified on December 15, 1791, in response to increasing infringements on privacy in the colonies and England. In England, "general warrants" allowed royal officials to search the belongings of anyone they suspected of being a political enemy, without requiring any additional cause. In the colonies, "writs of assistance" authorized officials to conduct warrantless searches for untaxed items. The Fourth Amendment was created to prevent these types of unreasonable searches and seizures and to protect the privacy of individuals.
The amendment requires that searches and seizures be reasonable and that no excessive force be used. Warrantless searches and seizures are generally presumed to be unreasonable unless they fall within specific exceptions. Courts must balance the individual's right to privacy with the government's interests in exigent circumstances. To claim a violation of Fourth Amendment rights, claimants must prove that their privacy was invaded.
The Fourth Amendment has been the subject of several court cases, including Silverthorne Lumber Co. v. United States (1920) and Nardone v. United States (1949), which ruled that illegally seized evidence was inadmissible in court. The amendment has also been invoked in debates surrounding mass surveillance programs, with critics arguing that these programs are too invasive and violate the right to privacy.
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Unreasonable searches and seizures
The Fourth Amendment of the U.S. Constitution protects the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures. This amendment was ratified on December 15, 1791, in response to increasing infringements on privacy in the colonies and England. In England,
The Fourth Amendment states that no warrants shall be issued without probable cause, supported by oath or affirmation, and must particularly describe the place to be searched and the persons or things to be seized. The amendment's core purpose is to protect people's right to privacy and freedom from unreasonable intrusions by the government. However, it is important to note that the Fourth Amendment does not guarantee protection from all searches and seizures, but only those conducted by the government and deemed unreasonable under the law.
To claim a violation of Fourth Amendment rights, courts require claimants to prove that their privacy was invaded. The protection under the Fourth Amendment can be waived if an individual voluntarily consents to, or does not object to, evidence collected during a warrantless search or seizure. The reasonableness of a search or seizure is the ultimate measure of its constitutionality, and courts will consider factors such as the degree of intrusion and the manner in which it was conducted.
The Fourth Amendment has been the subject of numerous court cases, including Silverthorne Lumber Co. v. United States (1920), Nardone v. United States (1949), and ACLU v. Clapper, where the court ruled that the government's telephone data-gathering system was necessary to thwart potential terrorist attacks and did not violate constitutional rights. The amendment has also faced challenges in the digital age, with debates surrounding mass surveillance programs and the balance between public safety and individual privacy.
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Probable cause
The Fourth Amendment of the US Constitution protects people's right to privacy and freedom from unreasonable intrusions by the government. It states that:
> 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 to be seized.
The Fourth Amendment does not define "probable cause", leaving the interpretation of the term to the judiciary. Probable cause is determined by the factual and practical considerations of everyday life on which reasonable and prudent men, not legal technicians, act".
In the context of searches and seizures of persons, probable cause may justify strip searches and visual body cavity searches if conducted in a reasonable manner.
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Protection from government intrusion
The Fourth Amendment of the U.S. Constitution protects people from unreasonable searches and seizures by the government. It states that:
> [t]he 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 to be seized.
The Fourth Amendment was ratified on December 15, 1791, in response to increasing infringements on privacy in the colonies and England. In England, "general warrants" allowed royal officials to search a person's belongings if they were suspected of being political enemies. Similarly, in the colonies, "writs of assistance" allowed officials to conduct warrantless searches for untaxed items.
The Fourth Amendment's core is the right to retreat into one's home and be free from unreasonable government intrusion. This protection extends to all, whether accused of a crime or not, and applies to federal officials and the courts. The amendment does not, however, guarantee protection from all searches and seizures, but only those conducted by the government and deemed unreasonable under the law.
To claim a violation of Fourth Amendment rights, a claimant must prove that they were the victim of an invasion of privacy. The protection under the amendment can be waived if one voluntarily consents to a warrantless search or seizure, or does not object to evidence collected during such a search or seizure.
The reasonableness of a search or seizure is the ultimate measure of its constitutionality, and warrantless searches and seizures are presumed to be unreasonable unless they fall within certain exceptions. Courts will balance the degree of intrusion on an individual's right to privacy against the need to promote government interests in exigent circumstances.
The Fourth Amendment has been invoked in several Supreme Court cases, including Silverman v. United States (1961), Berger v. New York (1967), and United States v. Calandra (1974). The amendment has also been at the centre of debates surrounding mass surveillance programs, with critics arguing that they are too invasive to be justified under the Fourth Amendment.
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Warrantless searches
The Fourth Amendment of the U.S. Constitution protects citizens from "unreasonable searches and seizures" by the government. It states that "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 to be seized."
Other circumstances that may justify a warrantless search include:
- Consent: If an individual voluntarily consents to a search, the protection under the Fourth Amendment is waived.
- Plain View: If objects are in plain view, a warrant is not required as there is no reasonable expectation of privacy.
- Probable Cause and Exigent Circumstances: If there is probable cause to believe a crime is being committed and exigent circumstances exist, a warrantless search may be justified.
- Lawful Arrests: Officers do not need a warrant for searches incident to a lawful arrest.
- Abandoned Property: The seizure of abandoned property does not violate the Fourth Amendment as there is no reasonable expectation of privacy.
- Open Fields: Searching properties on an open field does not violate the Fourth Amendment as there is no reasonable expectation of privacy in these areas.
It's important to note that the Fourth Amendment only applies to government searches, including those conducted by city, state, or federal government agents. Courts require claimants to prove an invasion of privacy to have valid standing in claiming a violation of their Fourth Amendment rights.
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Frequently asked questions
The Fourth Amendment of the U.S. Constitution protects the right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures.
Reasonableness is the ultimate measure of the constitutionality of a search or seizure. Searches and seizures with a warrant must satisfy the reasonableness requirement. Warrantless searches and seizures are presumed unreasonable unless they fall within certain exceptions.
Yes, protection under the Fourth Amendment can be waived if you voluntarily consent to or do not object to evidence collected during a warrantless search or seizure.

























