The Fourth Amendment to the United States Constitution is part of the Bill of Rights. It prohibits unreasonable searches and seizures. In addition, it sets requirements for issuing warrants: warrants must be issued by a judge or magistrate, justified by 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 Foreign Intelligence Surveillance Act of 1978 is a United States federal law that establishes procedures for the surveillance and collection of foreign intelligence on domestic soil.
Katz v. United States, 389 U.S. 347 (1967), was a landmark decision of the U.S. Supreme Court in which the Court redefined what constitutes a "search" or "seizure" with regard to the protections of the Fourth Amendment to the U.S. Constitution. The ruling expanded the Fourth Amendment's protections from an individual's "persons, houses, papers, and effects", as specified in the Constitution's text, to include any areas where a person has a "reasonable expectation of privacy". The reasonable expectation of privacy standard, known as the Katz test, was formulated in a concurring opinion by Justice John Marshall Harlan II.
Mobile phone tracking is a process for identifying the location of a mobile phone, whether stationary or moving. Localization may be affected by a number of technologies, such as the multilateration of radio signals between (several) cell towers of the network and the phone or by simply using GNSS. To locate a mobile phone using multilateration of mobile radio signals, the phone must emit at least the idle signal to contact nearby antenna towers and does not require an active call. The Global System for Mobile Communications (GSM) is based on the phone's signal strength to nearby antenna masts.
Kyllo v. United States, 533 U.S. 27 (2001), was a decision by the Supreme Court of the United States in which the court ruled that the use of thermal imaging devices to monitor heat radiation in or around a person's home, even if conducted from a public vantage point, is unconstitutional without a search warrant. In its majority opinion, the court held that thermal imaging constitutes a "search" under the Fourth Amendment, as the police were using devices to "explore details of the home that would previously have been unknowable without physical intrusion." The ruling has been noted for refining the reasonable expectation of privacy doctrine in light of new surveillance technologies, and when those are used in areas that are accessible to the public.
NSA warrantless surveillance — also commonly referred to as "warrantless-wiretapping" or "-wiretaps" — was the surveillance of persons within the United States, including U.S. citizens, during the collection of notionally foreign intelligence by the National Security Agency (NSA) as part of the Terrorist Surveillance Program. In late 2001, the NSA was authorized to monitor, without obtaining a FISA warrant, phone calls, Internet activities, text messages and other forms of communication involving any party believed by the NSA to be outside the U.S., even if the other end of the communication lays within the U.S.
A GPS tracking unit, geotracking unit, satellite tracking unit, or simply tracker is a navigation device normally on a vehicle, asset, person or animal that uses satellite navigation to determine its movement and determine its WGS84 UTM geographic position (geotracking) to determine its location. Satellite tracking devices send special satellite signals that are processed by a receiver.
Hepting v. AT&T, 439 F.Supp.2d 974, was a class action lawsuit argued before the United States District Court for the Northern District of California, filed by Electronic Frontier Foundation (EFF) on behalf of customers of the telecommunications company AT&T. The plaintiffs alleged that AT&T permitted and assisted the National Security Agency (NSA) in unlawfully monitoring the personal communications of American citizens, including AT&T customers, whose communications were routed through AT&T's network.
The Protect America Act of 2007 (PAA),, is a controversial amendment to the Foreign Intelligence Surveillance Act (FISA) that was signed into law by U.S. President George W. Bush on August 5, 2007. It removed the warrant requirement for government surveillance of foreign intelligence targets "reasonably believed" to be outside the United States. The FISA Amendments Act of 2008 reauthorized many provisions of the Protect America Act in Title VII of FISA.
United States v. Knotts, 460 U.S. 276 (1983), was a United States Supreme Court case regarding the use of an electronic surveillance device. The defendants argued that the use of this device was a Fourth Amendment violation. The device in question was described as a beeper that could only be tracked from a short distance. During a single trip, officers followed a car containing the beeper, relying on beeper signal to determine the car's final destination. The Court unanimously held that since the use of such a device did not violate a legitimate expectation of privacy there was no search and seizure and thus the use was allowed without a warrant. It reasoned that a person traveling in public has no expectation of privacy in one's movements. Since there was no search and seizure there was not a Fourth Amendment violation.
United States v. Pineda-Moreno, 591 F.3d 1212 (2010) was a 2010 Ninth Circuit Court of Appeals case regarding the use of GPS devices. The court ruled that a placing a GPS tracking device a personal vehicle without a warrant did not violate a suspect's Fourth Amendment rights, even if the vehicle was parked in the defendant's driveway at the time the device was placed. The case was reversed and remanded by the United States Supreme Court in light of United States v. Jones.
United States v. Jones, 565 U.S. 400 (2012), was a landmark United States Supreme Court case in which the court held that installing a Global Positioning System (GPS) tracking device on a vehicle and using the device to monitor the vehicle's movements constitutes a search under the Fourth Amendment.
People v. Diaz, 51 Cal. 4th 84, 244 P.3d 501, 119 Cal. Rptr. 3d 105 was a Supreme Court of California case, which held that police are not required to obtain a warrant to search information contained within a cell phone in a lawful arrest. In a sting operation conducted by local police, the defendant, Gregory Diaz, was arrested for the sale of the illicit drug ecstasy and his cellphone, containing incriminating evidence, was seized and searched without a warrant. In trial court proceedings, Diaz motioned to suppress the information obtained from his cellphone, which was denied on the grounds that the search of his cellphone was incident to a lawful arrest. The California Court of Appeal affirmed the court's decision and was later upheld by the California Supreme Court. In 2014, the United States Supreme Court overruled that position in Riley v. California and held that without a warrant, police may not search the digital information on a cellphone that has been seized incident to arrest.
United States v. Graham, 846 F. Supp. 2d 384, was a Maryland District Court case in which the Court held that historical cell site location data is not protected by the Fourth Amendment. Reacting to the precedent established by the recent Supreme Court case United States v. Jones in conjunction with the application of the third party doctrine, Judge Richard D. Bennett, found that "information voluntarily disclosed to a third party ceases to enjoy Fourth Amendment protection" because that information no longer belongs to the consumer, but rather to the telecommunications company that handles the transmissions records. The historical cell site location data is then not subject to the privacy protections afforded by the Fourth Amendment standard of probable cause, but rather to the Stored Communications Act, which governs the voluntary or compelled disclosure of stored electronic communications records.
The third-party doctrine is a United States legal doctrine that holds that people who voluntarily give information to third parties—such as banks, phone companies, internet service providers (ISPs), and e-mail servers—have "no reasonable expectation of privacy" in that information. A lack of privacy protection allows the United States government to obtain information from third parties without a legal warrant and without otherwise complying with the Fourth Amendment prohibition against search and seizure without probable cause and a judicial search warrant.
The Fourth Amendment Protection Acts, are a collection of state legislation aimed at withdrawing state support for bulk data (metadata) collection and ban the use of warrant-less data in state courts. They are proposed nullification laws that, if enacted as law, would prohibit the state governments from co-operating with the National Security Agency, whose mass surveillance efforts are seen as unconstitutional by the proposals' proponents. Specific examples include the Kansas Fourth Amendment Preservation and Protection Act and the Arizona Fourth Amendment Protection Act. The original proposals were made in 2013 and 2014 by legislators in the American states of Utah, Washington, Arizona, Kansas, Missouri, Oklahoma and California. Some of the bills would require a warrant before information could be released, whereas others would forbid state universities from doing NSA research or hosting NSA recruiters, or prevent the provision of services such as water to NSA facilities.
The USA Freedom Act is a U.S. law enacted on June 2, 2015, that restored and modified several provisions of the Patriot Act, which had expired the day before. The act imposes some new limits on the bulk collection of telecommunication metadata on U.S. citizens by American intelligence agencies, including the National Security Agency. It also restores authorization for roving wiretaps and tracking lone wolf terrorists. The title of the act is a ten-letter backronym that stands for Uniting and Strengthening America by Fulfilling Rights and Ensuring Effective Discipline Over Monitoring Act of 2015.
The FISA Improvements Act is a proposed act by Senator Dianne Feinstein, Chair of the Senate Intelligence Committee. Prompted by the disclosure of NSA surveillance by Edward Snowden, it would establish the surveillance program as legal, but impose some limitations on availability of the data. Opponents say the bill would codify warrantless access to many communications of American citizens for use by domestic law enforcement.
The mosaic theory is a legal doctrine in American courts for considering issues of information collection, government transparency, and search and seizure, especially in cases involving invasive or large-scale data collection by government entities. The theory takes its name from mosaic tile art: while an entire picture can be seen from a mosaic's tiles at a distance, no clear picture emerges from viewing a single tile in isolation. The mosaic theory calls for a cumulative understanding of data collection by law enforcement and analyzes searches "as a collective sequence of steps rather than individual steps."
Carpenter v. United States, 585 U.S. ___, 138 S.Ct. 2206 (2018), is a landmark United States Supreme Court case concerning the privacy of historical cell site location information (CSLI). The Court held that the government violates the Fourth Amendment to the United States Constitution when it accesses historical CSLI records containing the physical locations of cellphones without a search warrant.
