US surveillance tech evolution beyond license plates

Leonardo's SignalTrace links phones to license plates

The US Supreme Court extended privacy protections to anonymized location data in Chatrie v. United States.

In a June 2026 decision, the US Supreme Court extended legal reasoning regarding physical movement privacy to anonymized location records in the Chatrie v. United States case. The court held that obtaining such location data constitutes a Fourth Amendment search, noting that even short-term monitoring can reveal sensitive information regarding political and family associations.

The case originated from a bank robbery investigation where police used a specific warrant to obtain anonymized location records for phones near the crime scene. By narrowing the list based on movements, investigators eventually obtained the names of several users. While the ruling clarified protections for location records, it did not determine whether the collection of wireless signals, such as those used by SignalTrace, would also be classified as a search.

A Scientific Reports study demonstrated that four spatiotemporal points could uniquely identify 95% of individuals in a dataset.

A study published in the journal Scientific Reports examined 15 months of records involving 1.5 million people. The research found that just four time-and-place points were sufficient to uniquely identify 95% of the individuals within that dataset.

A PNAS study showed that Bluetooth proximity patterns could accurately classify 95% of friendships.

In a study published in the journal Proceedings of the National Academy of Sciences (PNAS), researchers followed 94 participants using phones that recorded Bluetooth proximity and calling patterns. The research found that patterns of behavior could accurately classify 95% of reciprocally reported friendships.

The study demonstrated that proximity outside of work and during off-hours played an important role in distinguishing friends from other people who regularly encounter one another. The findings showed that repeated proximity can reveal social ties.

Leonardo's predecessor technology was listed on a New York state contract price list.

The technology that preceded Leonardo's current systems was previously documented on an official New York state contract price list in the United States.

The US Supreme Court ruled in Carpenter v. United States that phone location records are protected by the Fourth Amendment.

In the Carpenter v. United States case, the US Supreme Court concluded that people have a reasonable expectation of privacy in the record of their physical movements. The justices recognized that phone location records can reveal far more than just movement.