Geofence Warrants: Is Your Cellphone Location Data Protected?

Law enforcement agencies use geofence warrants to request location data from tech companies about which mobile devices were present within a specific geographic area, known as a geofence, during a specific timeframe.

Geofence warrants are useful to law enforcement when they know the approximate timeframe and location of the crime scene, but not the identities of the suspects. These warrants help law enforcement narrow down a pool of suspects who were at or near the crime scene at the time of the crime.

However, there are major outstanding questions about the constitutionality of geofence warrants. If you’re questioning the legality of a geofence warrant or seeking to suppress evidence obtained from an unlawful search, consult with a skilled criminal law defense lawyer who can explain your options and help protect your interests.

What Are Geofence Warrants?

Unlike traditional search warrants, which start with a known suspect and issue a warrant to gather information about that suspect, geofence warrants operate in reverse.

They begin with the location and timeframe, compelling tech companies and internet service providers to disclose information about specific users or devices interacting with their services within a particular geographic region.

Law enforcement can use this data to narrow down the pool of potential suspects who were near the crime scene at the time of the crime.

How Do Geofence Warrants Work?

A geofence warrant works by collecting data from devices within a specific area over a set period. Law enforcement typically serves geofence warrants to technology companies.

Geofence warrants generally proceed along the following steps:

• Initial data collection. Law enforcement officers obtain a geofence warrant to request anonymized numerical identifiers and time-stamped location data for all devices that were in a defined area during a specific time window. Law enforcement can use a subpoena to link the anonymous IDs to subscriber information.
• Data review and refinement. Investigators analyze the initial list of users to narrow it down using additional investigative methods. They may also request additional information about the users’ location history without geographic restrictions.
• Identifying users. Once the list is refined, law enforcement seeks deanonymized details, such as usernames, birth dates, and other personal information) for the selected device. This can be done through the original warrant, an additional warrant, a court order, or a subpoena.

This process allows law enforcement officers to pinpoint individuals based on the cellphone location data from their devices, progressively narrowing down the pool of potential account holders.

Fourth Amendment Concerns with Geofence Warrants

Over the last century, courts have assessed the constitutional implications of technologies used to investigate suspects, such as wiretaps, thermal imaging, and GPS tracking. These cases have examined how the Fourth Amendment’s prohibition on unreasonable searches and seizures applies to new investigative tools that involve location tracking.

To determine whether a particular means of gathering information constitutes a “search” under the Fourth Amendment, courts generally look to whether the government action violates a person’s reasonable expectation of privacy.

How Do Geofence Warrants Impact Your Privacy?

Originally used by companies to provide targeted ads to their users, geofences have become a tool for law enforcement in criminal investigations since the mid-2010s. While useful, they raise privacy concerns due to the sensitive data they collect.

Currently, tech companies self-regulate geofence data collection. For example, Google reduced the default time it stores location data from users who have opted into its location history service. However, this type of data remains a target for law enforcement agencies, often accessed through geofence warrants rather than through direct searches of devices.

Geofence warrants cast a wide net, collecting location data from a broad swath of individuals, most of whom have no connection to the crimes under investigation. This broad approach has significantly increased the government’s ability to locate and track individuals with minimal investigation or resources.

Types of Data That Geofence Warrants Collect

Location history data includes:

• Cellphone location information from nearby cell towers
• Bluetooth beacons
• IP address information
• Device IDs
• Signal strength of nearby WiFi networks

While this can be helpful for investigations, geofence warrants often result in the disclosure of information about innocent individuals, sparking ongoing debates about privacy and surveillance.

Further, geofence warrants raise concerns about the government tracking Americans’ activities and associations, from protests to political activities to worship, by drawing a geofence around particular areas.

Are Geofence Warrants Legal?

Courts have been divided on the legality of geofence warrants, with divergent opinions on whether they constitute a “search” and whether there are adequate safeguards to protect an individual’s privacy.

Geofence warrants may be considered general warrants, which the Fourth Amendment prohibits since they lack probable cause and specificity. They raise two principal legal issues:

1. Does the collection and review of geofence data constitute a “search” that triggers Fourth Amendment protections?
2. If so, does the warrant process sufficiently protect an individual’s Fourth Amendment right against unreasonable searches and seizures?

Carpenter v. United States: Constitutionality of Collecting Cell Phone Location Data

Under the “third-party doctrine,” a person does not have a reasonable expectation of privacy if they’ve voluntarily given their information to third parties. In Carpenter v. United States, the U.S. Supreme Court limited the broad application of the third-party doctrine, ruling that accessing historical cell-site location information (CSLI) without a warrant violated the Fourth Amendment.

Chief Justice John Roberts, writing for the 5-4 majority, stated that when the government tracks a cell phone’s location, it achieves near-perfect surveillance, as if it had attached an ankle monitor to the phone’s user.

While the Carpenter decision set a precedent for requiring warrants to extract historical cell phone data from cell towers, it did not establish a general precedent for using other means to geolocate Americans, such as tracking people through their phones.

Chatrie v. United States: Constitutionality of Geofence Warrants

In early 2026, the U.S. Supreme Court heard oral arguments in Chatrie v. United States, a case from the U.S. Fourth Circuit Court of Appeals, on whether geofence warrants violate the Fourth Amendment’s protections against unreasonable searches.

Chatrie Case Background

Okello Chatrie was convicted of bank robbery in Virginia for stealing from a credit union. Law enforcement used a geofence warrant to identify cellphones within 150 meters of the crime scene during a specific timeframe.

Though a three-step process, Google provided anonymized location data, which was narrowed down to identify Chatrie as a suspect. He was indicted and sentenced to over 11 years in prison after his motion to suppress the geofence evidence was denied under the good-faith exception.

In addition to locating the suspect, the geofence warrant also captured data from innocent hotel guests, residents of an apartment house, a retirement home, and diners at a restaurant.

Chatrie Case History

The Fourth Circuit previously declined to extend the Carpenter ruling to geofence warrants, concluding that the defendant lacked a reasonable expectation of privacy in Google’s location history data.

The Fourth Circuit reasoned that, unlike CSLI, geolocation information is voluntarily shared. It is off by default and requires users to actively enable location history. As a result, the Fourth Circuit held that the third-party doctrine applied and upheld the geofence warrant, ruling that Chatrie had no reasonable expectation of privacy in his voluntarily shared location data.

Chatrie appealed the case to the U.S. Supreme Court, which heard oral arguments in April 2026. The Court’s decision in this case, expected by July 2026, could impose stricter limits on geofence warrants and will have far-reaching implications on how digital privacy and law enforcement intersect in the digital age.

What Are Your Rights If Your Data Is Collected?

Caselaw is still developing regarding geofence warrants, and it remains unclear whether they can satisfy Fourth Amendment requirements of particularity and probable cause. Until the U.S. Supreme Court rules on this issue, outcomes could vary.

If your information has been collected as part of a geofence warrant, here are steps you can consider, depending on how you were impacted:

• Public advocacy. If you discover your information was included in a geofence warrant, you can educate the pubic about the potential for privacy harms of geofence warrants by engaging with the media. However, it’s wise to work with an attorney before going public to ensure your rights are protected.

• Legislation. You can advocate for change by contacting your state legislators. Encourage them to propose laws that ban or restrict the use of geofence warrants by law enforcement.
• Litigation. If you’re facing criminal charges involving a geofence warrant, talk to an experienced criminal defense attorney about challenging the geofence warrant.

The outcome of Chatrie could have significant implications for geofence warrants.

An Experienced Criminal Attorney Can Help Safeguard Your Privacy

Your Fourth Amendment rights are critically important. If you believe your rights have been violated by a geofence warrant, it is a good idea to consult with a local criminal law defense lawyer who can protect your rights. They can assess your case and explain your legal options.