Add Bluetooth to the Long List of Border Surveillance Technologies
A new report from news outlet NOTUS shows that at least two Texas counties along the U.S.-Mexico border have purchased a product that would allow law enforcement to track devices that emit Bluetooth signals, including cell phones, smartwatches, wireless earbuds, and car entertainment systems. This incredibly personal model of tracking is the latest level of surveillance infrastructure along the U.S.-Mexico border—where communities are not only exposed to a tremendous amount of constant monitoring, but also serves as a laboratory where law enforcement agencies at all levels of government test new technologies.
The product now being deployed in Texas, called TraffiCatch, can detect Wi-Fi and Bluetooth signals in moving cars to track them. Webb County, which includes Laredo, has had TraffiCatch technology since at least 2019, according to GovSpend procurement data. Val Verde County, which includes Del Rio, approved the technology in 2022.
This data collection is possible because all Bluetooth devices regularly broadcast a Bluetooth Device Address. This address can be either a public address or a random address. Public addresses don’t change for the lifetime of the device, making them the easiest to track. Random addresses are more common and have multiple levels of privacy, but for the most part change regularly (this is the case with most modern smartphones and products like AirTags.) Bluetooth products with random addresses would be hard to track for a device that hasn’t paired with them. But if the tracked person is also carrying a Bluetooth device that has a public address, or if tracking devices are placed close to each other so a device is seen multiple times before it changes its address, random addresses could be correlated with that person over long periods of time.
It is unclear whether TraffiCatch is doing this sort of advanced analysis and correlation, and how effective it would be at tracking most modern Bluetooth devices.
According to TraffiCatch’s manufacturer, Jenoptik, this data derived from Bluetooth is also combined with data collected from automated license plate readers, another form of vehicle tracking technology placed along roads and highways by federal, state, and local law enforcement throughout the Texas border. ALPRs are well understood technology for vehicle tracking, but the addition of Bluetooth tracking may allow law enforcement to track individuals even if they are using different vehicles.
This mirrors what we already know about how Immigration and Customs Enforcement (ICE) has been using cell-site simulators (CSSs). Also known as Stingrays or IMSI catchers, CSS are devices that masquerade as legitimate cell-phone towers, tricking phones within a certain radius into connecting to the device rather than a tower. In 2023, the Department of Homeland Security’s Inspector General released a troubling report detailing how federal agencies like ICE, its subcomponent Homeland Security Investigations (HSI), and the Secret Service have conducted surveillance using CSSs without proper authorization and in violation of the law. Specifically, the Inspector General found that these agencies did not adhere to federal privacy policy governing the use of CSS and failed to obtain special orders required before using these types of surveillance devices.
Law enforcement agencies along the border can pour money into overlapping systems of surveillance that monitor entire communities living along the border thanks in part to Operation Stonegarden (OPSG), a Department of Homeland Security (DHS) grant program, which rewards state and local police for collaborating in border security initiatives. DHS doled out $90 million in OPSG funding in 2023, $37 million of which went to Texas agencies. These programs are especially alarming to human rights advocates due to recent legislation passed in Texas to allow local and state law enforcement to take immigration enforcement into their own hands.
As a ubiquitous wireless interface to many of our personal devices and even our vehicles, Bluetooth is a large and notoriously insecure attack surface for hacks and exploits. And as TraffiCatch demonstrates, even when your device’s Bluetooth tech isn’t being actively hacked, it can broadcast uniquely identifiable information that make you a target for tracking. This is one in the many ways surveillance, and the distrust it breeds in the public over technology and tech companies, hinders progress. Hands-free communication in cars is a fantastic modern innovation. But the fact that it comes at the cost of opening a whole society up to surveillance is a detriment to all.
Source: https://www.eff.org/deeplinks/2024/05/add-bluetooth-long-list-border-surveillance-technologies
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