Does Privacy Exist Online?
The fast-paced evolution of mobile technology has created recent challenges regarding traditional notions of spatial privacy, as outlined by the Fourth Amendment. Constitutional jurisprudence has required, for years, law enforcement to identify a specific suspect and show a subjective probable cause before getting a search warrant. However, the rise of “geofence warrants,” or reverse-location searches, has inverted the precedent set forth by the Amendment. In this manner, instead of targeting individuals, a geofence warrant directs a technology company to search its databases for every mobile device that’s present within a specific geographic area. Therefore, every citizen is essentially treated as a criminal suspect if they fall under the given radius.
On June 29th, 2026, the Supreme Court gave its 6-3 decision, which was highly anticipated, in the case Chatrie v. United States. The majority of six justices held that geofence warrants violated the Fourth Amendment’s warrant requirement section. Justice Elena Kagan, writing for the majority, ruled that smartphone users are still protected by "reasonable expectation of privacy,” and so is their minute-by-minute location data. Even as this data is captured by third-party technology corporations, it still does not permit the utilization of geofence warrants.
Chatrie v. United States is a portrayal of vital and overdue judicial intervention that’s necessary to halt the erosion of constitutional liberties that is continually taking place in contemporary digital-age politics. In addition, by placing strict limits on reverse-location data sweeps, the Court was able to successfully place the Fourth Amendment’s impact into a modern reality. In other words, a smartphone was labelled by the Court as no longer a mère modern luxury, but rather a digital extension of a person that cannot be searched or have data retrieved from without individual suspicion.
The historical evolution of courts and their definition of the Fourth Amendment “search” has been brought about in the context of shared data. The landmark Supreme Court Case Katz v. United States in 1967 established that Fourth Amendment security protections were not founded on physical property lines. In this case, the Court ruled that a search happens when the government violates a person’s "reasonable expectation of privacy,” a standard that is set up to protect “people, not places.”
However, even this robust standard has contained a historically prevalent loophole known as the “Third-Party Doctrine.” Cases like United States v. Miller in 1976 and Smith v. Maryland in 1979 solidified this doctrine, which states that an individual has no real or legitimate expectation of privacy regarding information they choose to hand over to third parties. For instance, by providing phone numbers you’ve dialed to your phone company, or keeping all your financial logs in a bank, the risk that the company can provide this information and your records to law enforcement at any time should be assumed. For decades before the June 29th decision, police and law enforcement have been able to glean and gather a huge amount of information and personal data about individuals without the need to establish probable cause or issue a search warrant.
The tension between 20th-century doctrines set in place and new, modern 21st-century technology reached a primitive crisis point as the widespread adoption of smartphones first occurred. In Carpenter v. United States (2018), the Supreme Court first recognized that the third-party doctrine could no longer be applied without questioning in the new digital age. In this case, the Court upheld that the government conducted a Fourth Amendment search when it took historical cell-site location information, or CSLI, from a wireless carrier. Chief Justice John Roberts specifically noted that smartphones are “compulsively carried” and record a detailed amount of movement on behalf of their owners. The Carpenter Court ruled that this data was a mandatory item to share in modern life, and therefore could not be considered “voluntarily shared” under the older third-party doctrine guidelines.
In conclusion, before Chatrie's pivotal decision, the United States Department of Justice effectively capitalized on the existing loophole, highlighting the need for clarity and reform in the legal framework to prevent such exploitation in the future.