TL;DR: The Electronic Frontier Foundation has mapped more than 40 hidden license plate readers along Southern California’s border highways. They’re disguised as abandoned trailers and construction barrels. Caltrans issued 8 permits to federal agencies (Border Patrol and DEA) to install them on state roads. The cameras capture your plate, vehicle description, GPS coordinates, and sometimes photos of you and your passengers. All of it flows into federal databases. California law says state agencies can’t share ALPR data with immigration enforcement. By getting Caltrans permits, the feds may be bypassing that protection entirely.
An Abandoned Trailer That Wasn’t Abandoned
James Cordero was driving a cracked two-lane road in eastern San Diego County when something caught his eye. A trailer sat on the shoulder. Looked abandoned. He pulled over to check it out [1].
Inside: surveillance equipment. A hidden camera. Not abandoned at all.
That discovery led CalMatters reporters Wendy Fry and Khari Johnson to investigate. What they found: a covert network of license plate readers spanning the backcountry between San Diego and Arizona. The cameras log every car passing through: citizens, residents, tourists, humanitarian workers. All of them [1][2].
More Than 40 Hidden Cameras
The Electronic Frontier Foundation mapped the network [2][3]. The numbers:
- 40+ license plate readers hidden along border highways
- San Diego and Imperial counties primarily affected
- 8 Caltrans permits issued to federal agencies before Biden left office
- 14 permit applications submitted between 2015-2024 (8 approved, 4 canceled, 2 inactive)
Locations include Old Highway 80 near Jacumba Hot Springs, outside the Golden Acorn Casino in Campo, and along Interstate 8 toward In-Ko-Pah Gorge [2].
The cameras aren’t sitting in plain sight with “BORDER PATROL” stickers. They’re inside trailers. Inside construction barrels. Designed to blend in. Designed to not be found.
What the Cameras Capture
A Homeland Security report describes what flows into federal databases [2]:
- License plate numbers
- Vehicle make, model, and registration state
- GPS coordinates and timestamps
- Camera owner and type information
- “Surrounding environment”, which can include photos of drivers and passengers
That data feeds into predictive intelligence programs that track American drivers nationwide. Your trip to Jacumba? Logged. Your casino visit? Logged. Your supply run to a remote community? Logged.
One grandmother with legal status told CalMatters she was questioned by Border Patrol about her casino visits. They deemed the frequency “suspicious” [2].
The California Law Problem
California has rules about license plate data. A 2016 law establishes strict protocols for automated license plate reader use. State and local agencies can’t share ALPR data with out-of-state entities, including federal agencies involved in immigration enforcement [2][3].
The California Attorney General has sent enforcement letters to 18 law enforcement agencies for violating these provisions. El Cajon Police and the Imperial County Sheriff’s Office got warnings [2].
But here’s the catch: the feds went around it.
Instead of asking local police to share data, Border Patrol and DEA got Caltrans permits to install their own cameras on state highway land. They don’t need local agencies to share anything. They’re collecting it themselves.
“By allowing Border Patrol and the DEA to put license plate readers along the border, they’re essentially bypassing protections under California law,” EFF’s Dave Maass told CalMatters [2].
Caltrans Says It’s Not Their Problem
When asked about the permits, Caltrans issued a statement [2]:
“Caltrans does not operate, manage, or determine the specific use of technology or equipment installed by permit holders, nor does it have access to any of the collected data.”
Translation: we gave them permits, but what they do with the cameras isn’t our concern.
Neither Customs and Border Protection nor the Department of Homeland Security responded to CalMatters’ requests for comment about the program’s scope or applications [1][2].
Chilling Effect on Humanitarian Work
The surveillance network affects more than commuters. Volunteers who leave water and supplies for migrants crossing through remote desert areas now fear surveillance and detention [2].
When every vehicle is logged, every trip recorded, humanitarian workers become traceable. Their patterns become data points. The cameras don’t distinguish between someone running drugs and someone leaving water bottles.
That’s the problem with mass surveillance. It doesn’t target criminals. It targets everyone.
Part of a Bigger Pattern
This isn’t the first time California border communities have faced federal surveillance overreach. A June 2025 CalMatters investigation found that Southern California law enforcement agencies were already sharing ALPR data with federal agencies in violation of state law [2].
The hidden camera network is the next step: cut out the middleman entirely. Why ask local police to break state law when you can just install your own cameras?
Privacy advocates are calling on California to rescind the permits [1][3]. The EFF has published maps of the reader locations. The question now: will California do anything about equipment it already approved?
What You Can Do
- Contact your state representatives and ask them to revoke Caltrans permits for federal surveillance equipment
- Support the EFF’s Street-Level Surveillance Project which tracks and maps these deployments
- Document cameras if you see suspicious trailers or barrels with tech inside along border roads
- Know your rights: you can’t opt out of having your plate scanned, but you can demand accountability for how that data is used
California passed laws to limit license plate surveillance. The feds found a workaround. That’s not a legal gray area. It’s the kind of regulatory arbitrage that guts privacy protections.
Your car is being tracked on California roads. The data flows to federal databases. And the state agency that approved it says it’s not their problem.
Sources
Published: March 1, 2026