NYC brings AI gun scanners to the subway

New York City Mayor Eric Adams just announced that the city is bringing AI gun detection scanners to subway turnstiles. The city is partnering with Massachusetts-based Evolv Technologies to pilot the devices, following a high-profile shooting at a Brooklyn subway station last week where a man was shot with his own gun.

Under the city's POST Act, the NYPD has to wait 90 days before deploying the surveillance tech, giving officials time to publish impact reports and vet other competitors. Adams hasn't shared where or how many scanners will be installed, but he made his stance clear: while violent crime is technically down across the city, New Yorkers still feel terrified on public transit, and stats don't matter if people feel unsafe.

The messy track record behind the scanner

Evolv’s hardware looks a lot like a standard walk-through metal detector, but the company says it uses ultra-low frequency electromagnetic fields, sensors, and machine learning models to spot concealed weapons. Back in 2021, Evolv's CEO boldly claimed they had mapped out signatures for virtually every gun, bomb, and tactical knife in existence.

The real-world results paint a completely different picture. The scanners have reportedly flagged regular umbrellas as firearms while letting steel pipes cut like gun barrels slide right through. School districts using the gear have complained about lunchboxes getting tagged as bombs while actual knives in backpacks went completely undetected.

On top of that, Evolv is currently swimming in legal trouble. Industry watchdog IPVM revealed the company altered an allegedly independent testing report to erase poor detection rates. Both the FTC and the SEC have opened probes into whether the system actually works as advertised, and shareholders just hit the company with a class-action lawsuit this March. To add another layer of controversy, the New York Daily News previously reported that several of Mayor Adams' top donors hold significant investments in Evolv.

Why it matters

We think this pilot feels much more like security theater than a genuine technological breakthrough, and throwing it into the subway could backfire spectacularly.

For everyday commuters, this offers almost zero practical upside and a ton of friction. The New York subway system handles millions of people moving in tight, rapid waves. When an AI tool frequently flags everyday metal items like umbrellas, laptops, and thermos flasks, it will inevitably create bottleneck choke points at turnstiles and heighten unnecessary police confrontations. Instead of calming passengers down, having armed officers halt commuters over phantom weapons will likely spike public anxiety.

For the AI security sector, this test will serve as a high-stakes stress test that Evolv might not be ready for. Controlled stadium entrances are one thing; the chaotic environment of a subterranean transit hub is another beast entirely. If the tech fails publicly under the scrutiny of federal regulators, it could trigger stricter legal guardrails for biometric and weapons detection in public spaces nationwide.