Your Papers Are Now a Server

The Fourth Amendment protects "persons, houses, papers, and effects" against unreasonable searches and seizures. In 1791 that list was nearly complete. A person's private life sat in a desk, a trunk, a locked drawer, all inside a building whose door a constable had to pass. Today the equivalent material sits on servers owned by companies the person has never visited.

The doctrine has moved, though unevenly. Katz v. United States (1967) shifted the question from physical trespass to whether a person had a reasonable expectation of privacy, holding that a warrantless wiretap of a public phone booth was a search. Riley v. California (2014) held unanimously that police generally need a warrant to search the contents of a cell phone seized during an arrest, observing that a modern phone holds the privacies of life in a way a cigarette pack does not. Carpenter v. United States (2018) held that obtaining seven days or more of historical cell-site location records from a carrier is a search requiring a warrant, despite the records being held by a third party.

Carpenter matters because it cut into what is called the third-party doctrine: the older rule that information voluntarily given to a business carries no Fourth Amendment protection. That rule made sense for a canceled check. It makes far less sense when carrying a phone is the price of participating in ordinary life, and when the resulting record is a continuous log of where a person slept, prayed, and met.

Large areas remain unsettled as a matter of law rather than opinion. Purchases of location data from commercial brokers, automated license plate reader networks, facial recognition matching, and searches of devices at the border are governed by a patchwork of statutes, agency policies, and lower-court decisions that do not yet resolve into a single national standard. Saying so is not evasion; it is an accurate description of the state of the doctrine.

What the citizen can do is insist on the vocabulary. A warrant is issued by a judge on probable cause and describes the place to be searched and the things to be seized. A subpoena is not a warrant. Consent is not a warrant, and consent given because a request sounded like an order is a recurring problem in real cases. Asking whether a warrant exists, and asking to see it, is lawful, polite, and often the only moment at which the amendment does any work.

The founders wrote about houses because houses were where private life happened. Fidelity to their purpose means asking where private life happens now, and whether the same protections follow it there.