A company called Leonardo has developed a system called ELSAG SignalTrace. It broke into public awareness just days ago and is already being marketed to law enforcement agencies across the country. It makes Flock Safety look modest by comparison.
Here is what SignalTrace does:
Every time you drive past one of these upgraded cameras, the sensor sweeps up the unique electronic identifiers of every device in your vehicle. Your cell phone. Your smartwatch. Your wireless headphones. Your fitness tracker. Your laptop. Your tablet. Your car's own infotainment system. Your tire pressure sensors. Your vehicle's Bluetooth hotspot.
And your pet's microchip.
Every one of those devices emits a signal. SignalTrace captures those signals, timestamps them, ties them to your license plate, and stores them in a searchable database for future investigative use. The result is what Leonardo calls an electronic fingerprint — a unique profile built not from your face or your name, but from the constellation of devices you carry with you every day.
Leonardo announced the ELSAG EOC Plus patent as early as May 2024, describing it as an electronic detection system for identifying people of interest through electronic device signatures. SignalTrace is the commercial product built on that foundation. The patent came first. The marketing came after. The sales calls are happening now.
Here is where it gets worse.
SignalTrace is explicitly designed to track vehicles even when the license plate cannot be read. If your plate is obscured, dirty, or misread — it does not matter. The system identifies your vehicle by the electronic fingerprint of the devices inside it instead. The plate reader becomes optional. The surveillance does not.
The strategic advantage for police agencies is adoption friction. SignalTrace can be pitched as an extension of an existing ALPR ecosystem rather than a wholly separate surveillance buildout. That is exactly what happened with Flock. License plate readers went in first. Video came later through a software update. Nobody voted on the expansion. Nobody was told. SignalTrace follows the same playbook — attach to existing infrastructure and expand what it captures without requiring a new procurement process, a new vote, or a new public conversation.
Who is Leonardo and why does their background matter?
Leonardo US Cyber and Security Solutions is not a Silicon Valley startup. It is the American subsidiary of Leonardo S.p.A. — one of the largest aerospace, defense, and security conglomerates in the world, headquartered in Rome, Italy. Recent public market estimates place Leonardo S.p.A.'s market capitalization at approximately €29.76 billion — roughly $32 billion USD. For context that is nearly four times Flock Safety's valuation. [...]
What is ELSAG — and why SignalTrace is more dangerous than it sounds.
ELSAG is Leonardo's license plate recognition product line — the company's core law enforcement technology that has been deployed across American communities for over two decades. ELSAG cameras are what you think of when you picture a standard license plate reader. Fixed cameras on poles. Mobile units mounted on patrol vehicles. Solar powered. Cellular connected. Reading plates and logging vehicle data.
ELSAG is already deployed in all fifty states. Virginia State Police is a documented customer. Leonardo holds statewide procurement contracts in New York, Maryland, New Mexico, Ohio, and Pennsylvania among others, and is listed on the federal GSA schedule available to agencies nationwide. Their cameras are already on street poles and patrol vehicles across the country — quietly, routinely, and largely without public awareness.
SignalTrace is not a new camera. It is not a new company. It is an upgrade — a sensor that clips directly onto ELSAG cameras already in the field and adds a new layer of data collection on top of the license plate reading that was already happening. The same pole. The same hardware. A new sensor attached to it that now also sweeps up every electronic device signal in every passing vehicle.
That is precisely what makes it so significant. The deployment barrier is almost zero. Any law enforcement agency that already has Leonardo ELSAG cameras can add SignalTrace capability without purchasing new infrastructure, without a new procurement process, and — depending on how their existing contract is written — potentially without returning to their city council for approval. Sound familiar? It should. It is the exact same function creep mechanism that allowed Flock Safety to add video streaming, vehicle fingerprinting, and AI people search to cameras that were originally sold as simple plate readers.
The infrastructure goes in first. The capabilities expand later. The public finds out last — if at all. [...]
The data retention problem.
With Flock we at least know the default data retention period is 30 days — though the contract language grants Flock a perpetual license to use that data regardless. With SignalTrace the situation is more opaque. Leonardo's product materials state that all data collected may be uploaded to the EOC server and archived for future queries and analysis — with no published retention limit. How long does Leonardo store your electronic fingerprint? Who has access to it? Can it be shared with other agencies or federal entities? Can it be purchased by data brokers? Leonardo's materials do not answer these questions. That silence is itself an answer.
The retail and private deployment problem.
Leonardo is actively marketing SignalTrace to shopping malls, retail centers, and private businesses — not just law enforcement. Their materials describe deploying SignalTrace in parking lots and inside shopping centers to track individuals involved in organized retail crime. By identifying and correlating electronic devices carried by suspects, retailers can gain critical insights into criminal patterns.
That means SignalTrace sensors could be on private property you visit every day — your grocery store parking lot, your shopping mall, your workplace — operated by a private company with no law enforcement oversight, no warrant requirement, no public accountability, and no notification to you. Your electronic fingerprint captured every time you park your car. Stored indefinitely. Shared with whoever the private operator decides to share it with.
The no-plate-needed problem — and what it means for pedestrians.
The implication of being able to track a vehicle by its electronic fingerprint without reading the plate goes further than most people realize. Deliberately obscuring your plate — which some people do to avoid surveillance — provides zero protection against SignalTrace. The sensor does not need the plate. It reads your phone.
More critically — the sensor does not know or care whether the device it is reading is inside a vehicle or in the pocket of a pedestrian walking past the pole. A person walking down the sidewalk past a SignalTrace-equipped camera is emitting the same Bluetooth and Wi-Fi signals as a person driving past in a car. The system's sensors capture signals from whatever passes within range. Whether that includes pedestrian device capture is not addressed in Leonardo's public materials. The fact that it is not addressed is worth noting. [...]
SignalTrace does not aggregate your vehicle's movements. It aggregates your personal electronic identity — every device you carry, every signal you emit — and ties it permanently to a location, a timestamp, and a plate number. It does not track your car. It tracks you. Personally. Individually. Every time you pass a sensor, whether you are suspected of anything or not.
by BlackBetty (Anonymous), X | Read more:
Image: Natasha Eliya/Michigan Daily via
[ed. Public service announcement. Are they actually able to do this with the weak signal of wifi and Bluetooth? Wouldn't be surprised. See also: SignalTrace just weaponized your AirPods against license plate readers nationwide (Cambridge Analytica).]
