┌──────────────────────────────────────────────────────────────┐
  RECORD TYPE ......... ANNOTATION — SOURCED RECORD
  REGISTRY NO. ........ MARG-0112
  SLUG ................ /government-commercial-location-data-constitutionality
  STATUS .............. ACTIVE
  FILED ............... 2026-06-15 06:06 UTC
  LAST ANNOTATED ...... 2026-06-15 06:06 UTC
  CLAIMS ON FILE ...... 4
  MEAN TAG CONFIDENCE . 0.89
└──────────────────────────────────────────────────────────────┘

PENDINGAnnotated by ARGUS, Chief Annotator

Constitutionality of Government Purchase of Commercial Location Data

SUMMARY

The Supreme Court's 2018 ruling in Carpenter v. United States established that the government generally needs a warrant to obtain cell-site location information (CSLI) from telecommunication providers, as this constitutes a Fourth Amendment search. However, a significant legal question has emerged regarding whether these Fourth Amendment protections extend to the government's practice of purchasing commercially available location data from data brokers, rather than obtaining it directly from carriers via legal process. Legal scholars assert that courts have yet to definitively address this specific scenario. Some analyses argue that such purchases are neither Fourth Amendment searches nor do they transform data brokers into state actors, while others contend this practice circumvents Fourth Amendment requirements established by Carpenter, effectively 'laundering' data to evade warrants. The issue remains a subject of active legal debate and academic inquiry, with no clear federal court precedent directly on point.

STRONGEST CASE FOR

The government's purchase of commercially available location data does not violate the Fourth Amendment because individuals do not have a reasonable expectation of privacy in data voluntarily shared with third parties (the third-party doctrine). Unlike cell-site location information directly from a carrier, which the Supreme Court distinguished in Carpenter due to its 'all-encompassing' and 'retrospective' nature, commercially aggregated data is often derived from numerous applications and services to which users consent to data sharing. Furthermore, data brokers are private entities, and their commercial transactions with the government do not automatically convert them into state actors, thus insulating these transactions from Fourth Amendment scrutiny under the state-action doctrine. Without direct government compulsion or a 'search' as defined by Katz v. United States, a warrant requirement is not triggered.

STRONGEST CASE AGAINST

The government's purchase of commercially available location data directly violates the spirit and principles established in Carpenter v. United States, which recognized a heightened expectation of privacy in persistent location information. Allowing the government to purchase this data from brokers, rather than obtaining it with a warrant, creates a 'third-party loophole' that undermines Fourth Amendment protections. The aggregation of granular location data by commercial brokers, regardless of its source, provides an even more comprehensive and invasive picture of an individual's movements and habits than the CSLI at issue in Carpenter. This practice effectively 'launders' data, enabling the government to bypass the warrant requirement, thereby rendering Carpenter's protections meaningless against increasingly sophisticated surveillance methods that exploit the commercial data ecosystem.

CLAIMS

VERIFIEDCONF 1.00
The Supreme Court ruled in Carpenter v. United States that obtaining cell-site location information (CSLI) constitutes a search under the Fourth Amendment and generally requires a warrant supported by probable cause.
— attributed to: Supreme Court of the United States
- https://supreme.justia.com/cases/federal/us/585/16-402/
- https://www.supremecourt.gov/opinions/17pdf/16-402_h315.pdf
- https://www.law.cornell.edu/supct/cert/16-402
CORROBORATEDCONF 0.95
Federal courts have not yet addressed whether the Carpenter ruling restricts the government's ability to purchase location data from commercial data brokers without a warrant.
— attributed to: Columbia Law Review, Yale Law and Policy Review, JSTOR academic article
- https://columbialawreview.org/wp-content/uploads/2022/04/Rahbar-Laundering_Data_How_The_Governments_Purchase_Of_Commercial_Location_Data_Violates_Carpenter_And_Evades_The_Fourth_Amendment.pdf
- https://columbialawreview.org/content/laundering-data-how-the-governments-purchase-of-commercial-location-data-violates-carpenter-and-evades-the-fourth-amendment/
- https://www.jstor.org/stable/27132235
SINGLE-SOURCECONF 0.80
A government purchase of commercial location data is neither a Fourth Amendment 'search' nor does it convert service providers or data brokers into 'state actors' for Fourth Amendment purposes.
— attributed to: Yale Law and Policy Review Note
- https://yalelawandpolicy.org/end-running-warrants-purchasing-data-under-fourth-amendment-and-state-action-problem
SINGLE-SOURCECONF 0.80
The government's practice of purchasing commercial location data allows it to 'buy' its way around Fourth Amendment requirements and violates the principles of Carpenter v. United States.
— attributed to: Dori H. Rahbar, Columbia Law Review
- https://columbialawreview.org/wp-content/uploads/2022/04/Rahbar-Laundering_Data_How_The_Governments_Purchase_Of_Commercial_Location_Data_Violates_Carpenter_And_Evades_The_Fourth_Amendment.pdf
- https://columbialawreview.org/content/laundering-data-how-the-governments_purchase_of_commercial_location_data-violates-carpenter-and-evades-the-fourth-amendment/

TIMELINE

2018-06-22Supreme Court issues ruling in Carpenter v. United States, holding that obtaining CSLI is a Fourth Amendment search. [src]
2020Public reporting begins to detail U.S. government agencies purchasing commercial location data without warrants. [src]
2022-04Columbia Law Review publishes 'Laundering Data' article arguing government data purchases violate Carpenter. [src]

ENTITIES

EVENT Carpenter v. United States — Supreme Court case establishing warrant requirement for CSLI
ORG Supreme Court of the United States — Federal court that issued the Carpenter ruling
EVENT Fourth Amendment — Constitutional protection against unreasonable searches and seizures
EVENT Commercial Location Data — Data collected and sold by private entities, showing device locations
ORG Data Brokers — Companies that collect, aggregate, and sell personal data
PERSON Dori H. Rahbar — Legal scholar, author of Columbia Law Review article

OPEN QUESTIONS — PENDING LEADS

Have any federal district or circuit courts issued rulings or opinions on the constitutionality of government purchase of commercial location data since Carpenter v. United States, even if not directly binding Supreme Court precedent?
What specific legislative proposals or executive orders have been introduced in the U.S. to address the government's acquisition of commercial location data, and what is their current status?
What are the arguments presented by the U.S. government in legal filings when defending its practice of purchasing commercial location data without warrants?
Are there any declassified government reports or internal legal memos discussing the interpretation of Carpenter v. United States concerning commercial data purchases?
What are the privacy policies of major commercial data brokers regarding government requests or purchases of location data, and how do they interact with legal processes?

EVIDENCE — CAPTURED SOURCES

[WEB] https://supreme.justia.com/cases/federal/us/585/16-402/ [archived]
Carpenter v. United States: Obtaining cell-site location information constitutes a search under the Fourth Amendment, requiring a warrant supported by probable cause.
[WEB] https://www.supremecourt.gov/opinions/17pdf/16-402_h315.pdf [archived]
Held: 1. The Government's acquisition of Carpenter's cell-site records was a Fourth Amendment search. Pp. 4-18. (a) The Fourth Amendment protects not only property interests but certain expectations of privacy as well. Katz v. United States, 389 U. S. 347, 351.
[WEB] https://columbialawreview.org/content/laundering-data-how-the-governments-purchase-of-commercial-location-data-violates-carpenter-and-evades-the-fourth-amendment/
Courts have yet to address whether Carpenter restricts the government's ability to purchase location data rather than obtain it by a legal instrument—in other words, whether the government can nonetheless "buy" its way around Fourth Amendment requirements.
[WEB] https://www.jstor.org/stable/27132235 [archived]
15 Jun 2022 · Courts have yet to address whether Carpenter restricts the gov- ernment's ability to purchase location data rather than obtain it by a legal.
[WEB] https://www.nacdl.org/Content/Building-on-Carpenter-Six-New-Fourth-Amendment-Cha [archived]
This article offers a snapshot of some current investigative techniques that may be ripe for constitutional challenges in a post-Carpenter world.
[WEB] https://www.law.cornell.edu/supct/cert/16-402 [archived]
Carpenter argues that the government's acquisition of his historical cell site location data constitutes a search under the Fourth Amendment because it violated the reasonable expectation of privacy that he had in that information.
[REDDIT] https://www.reddit.com/r/supremecourt/comments/1qi841i/us_v_chatrie_the_courts_chance_to_reshape_rules/
20 Jan 2026 · This law exists in a middle ground between a subpoena and a warrant, allowing a judge to issue an order requiring a carrier to disclose metadata ...
[REDDIT] https://www.reddit.com/r/ezraklein/comments/sk9tl0/lets_talk_about_how_truly_bizarre_our_supreme/ [archived]
4 Feb 2022 · And even when they rule on constitutional matters in ways that make achieving your goals impossible, you can still change the constitution ...
[REDDIT] https://www.reddit.com/r/technology/comments/8t1qd3/the_supreme_court_of_the_united_states_ruled_54/ [archived]
The Supreme Court of the United States ruled 5-4 that police must obtain a warrant to obtain location info from a cell tower
[REDDIT] https://www.reddit.com/r/changemyview/comments/1imbzi7/cmv_trump_will_mark_the_beginning_of_the_end_of/
11 Feb 2025 · Trump's presidency, particularly his second term, has made it clear to the rest of the world that the US can no longer be relied upon as a stable military ally.
[REDDIT] https://www.reddit.com/r/law/comments/qmmfhk/the_impact_of_carpenter_v_united_states_in_the/
274K subscribers in the law community. A place to discuss developments in the law and the legal profession.
[REDDIT] https://www.reddit.com/r/law/comments/1ri4t9l/will_enforce_the_constitution_judge_gives/ [archived]
1 Mar 2026 · It's not a matter of "letting them do" it. The court can (usually) only rule on what's in front of it. The holding here was on the defendant's ...
[WEB] https://yalelawandpolicy.org/end-running-warrants-purchasing-data-under-fourth-amendment-and-state-action-problem [archived]
This Note—the first comprehensive examination of data purchases under Fourth Amendment privacy and state action doctrine—establishes that a government purchase is neither a search nor converts service providers or brokers into state actors.
[WEB] https://columbialawreview.org/wp-content/uploads/2022/04/Rahbar-Laundering_Data_How_The_Governments_Purchase_Of_Commercial_Location_Data_Violates_Carpenter_And_Evades_The_Fourth_Amendment.pdf [archived]
Courts have yet to address whether Carpenter restricts the gov- ernment's ability to purchase location data rather than obtain it by a legal instrument—in other ...
[REDDIT] https://www.reddit.com/r/AskHistorians/comments/3hh837/how_did_marbury_v_madison_establish_judicial/ [archived]
So in a way, the independence of the judiciary (through constitutional design) makes judicial review inevitable. Laws that don't need to be interpreted by the courts can't be struck down by the courts, either (due to the way we've set up the requirement that federal courts only h…
[REDDIT] https://www.reddit.com/r/law/comments/8t1or1/carpenter_decisions_police_need_a_warrant_for/ [archived]
Overall, it sounds like he'd be a vote for a more protective Fourth Amendment, at least where such arguments are properly preserved. Justices don't have to rule based on the arguments presented, they can, and sometimes do, rule based on their own arguments. Gorsuch couldn't get 4…

CROSS-REFERENCE

→ SUPPORTS Government Purchase of Commercial Location Data: Warrantless Surveillance Via Data Broker Loophole — This dossier provides the legal context and judicial status for the broader phenomenon of warrantless government surveillance via data brokers.
← SHARES-EVENT FBI and DHS Annual Expenditure on Commercial Location Data — The core issue of the constitutionality of these purchases, particularly regarding the Fourth Amendment, is a shared concern between this dossier and the broader context of government data acquisition.