Federal agencies have turned your smartphone’s advertising system into a warrantless surveillance tool, circumventing the Fourth Amendment by purchasing location data that would otherwise require a court order to obtain.
Story Snapshot
- DHS agencies including CBP and ICE buy location data from advertising networks to track Americans without warrants
- Government exploits commercial ad tech infrastructure built through real-time bidding systems to monitor citizens’ movements
- Apple’s 2021 privacy changes led to 96% of U.S. users disabling tracking, yet Google maintains status quo enabling surveillance
- Seventy lawmakers demand investigation as ICE seeks new “Ad Tech” surveillance tools despite DHS claims it ended the practice
Government Exploits Big Tech’s Surveillance Machine
Customs and Border Protection operates a systematic program using location data harvested from the advertising ecosystem that powers targeted ads across websites and apps. Internal DHS documents obtained through investigative reporting reveal CBP acknowledges using “commercially available marketing location data” derived from real-time bidding systems. Between 2019 and 2021, CBP conducted a pilot program exploiting this advertising infrastructure for surveillance purposes. The same technology that tracks you to sell products now tracks you for federal law enforcement, no warrant required.
Constitutional Rights Sold to Highest Bidder
The Fourth Amendment exists precisely to prevent government from tracking citizens without judicial oversight. Federal agencies discovered they could sidestep constitutional protections by simply purchasing data from private brokers instead of obtaining warrants. ICE and CBP bought location information from data broker Venntel and used it to identify and arrest immigrants. By 2025, ICE purchased Webloc, a spy tool gathering locations from millions of phones and filtering by advertising IDs. This represents government deliberately exploiting legal loopholes to conduct massive privacy violations our Founders would have recognized as tyrannical.
How Your Phone Became a Tracking Device
Advertising IDs were introduced to smartphones in 2012, creating unique identifiers enabling both commercial tracking and government surveillance. The system operates through two mechanisms: software development kits embedded in weather, navigation, dating, and fitness apps collect location data and share it with brokers, while real-time bidding allows ad tech companies to harvest location information indirectly from websites and apps. Data brokers then package and sell this information to federal agencies. Your movement patterns between home, work, and other locations create unique signatures enabling identification despite claims of anonymization.
Apple Protected Users While Google Enables Tracking
Apple implemented App Tracking Transparency in 2021, requiring apps to request permission before accessing advertising IDs. Ninety-six percent of U.S. users opted out, and subsequent studies found iPhone users became less likely to experience financial fraud. This demonstrates privacy protections deliver tangible security benefits. Google, however, refused to follow Apple’s lead, maintaining the surveillance-enabling status quo. The contrast reveals Big Tech’s divided approach to user privacy versus advertiser demands. Meanwhile, DHS claimed in 2024 it was ending data broker contracts, yet recent reporting confirms the agency resumed mass tracking of Americans’ phones.
Congressional Action and Path Forward
Approximately seventy lawmakers have urged DHS oversight bodies to investigate government location data purchasing practices. The ACLU advocates passage of the Fourth Amendment Is Not For Sale Act, which would require warrants before accessing location data. Privacy advocates recommend Americans immediately disable advertising IDs on their devices, though comprehensive reform requires legislative action forcing industry restructuring away from surveillance-based business models. The advertising surveillance machine demonstrates how commercial infrastructure built without privacy constraints becomes weaponized for government overreach, threatening constitutional liberties and enabling enforcement targeting of specific communities without judicial review.
Sources:
Targeted Advertising Gives Your Location to the Government – Electronic Frontier Foundation
Ad Tech On Target: Now US Government Wants It – MediaPost
DHS Is Circumventing Constitution by Buying Data It Would Normally Need a Warrant to Access – ACLU
Brown Leads Oversight Letter on DHS-ICE’s Troubling Mass Surveillance Tech – Rep. Shontel Brown










