FTC v. Evolv: the AI scanner marketed as detecting all weapons missed a knife used in a school stabbing — a federal court entered a permanent injunction

The problem

Evolv Technologies sells the flagship product of AI-era physical security: the Evolv Express walk-through scanner, marketed as using artificial intelligence to spot concealed weapons in a moving crowd without the emptying-of-pockets ritual of a metal detector. The pitch worked — per the FTC’s complaint, Express scanners stood in over 800 schools across 40 states, and school systems made up half of Evolv’s business.

The Federal Trade Commission alleged the pitch outran the product. In its November 2024 complaint, the FTC said Evolv “misrepresented that its Evolv Express system will detect all weapons; ignore harmless personal items without requiring people to remove them from their pockets or bags; detect weapons more accurately and faster than metal detectors; reduce false alarm rates; and cut labor costs by 70% compared to metal detectors by reducing the need for additional personnel.”

What the FTC alleged (Evolv settled without admitting wrongdoing)

The complaint’s starkest example is a school: Evolv’s “Express scanners reportedly failed to detect a seven-inch knife brought into a school in October 2022 that was used to stab a student. Afterwards, school officials increased the system’s sensitivity settings, prompting a 50% false alarm rate” — the scanners flagging laptops, binders, and water bottles while the marketing promised they would be ignored.

“The FTC has been clear that claims about technology – including artificial intelligence – need to be backed up, and that is especially important when these claims involve the safety of children,” said Samuel Levine, Director of the FTC’s Bureau of Consumer Protection.

The order

The Commission voted 5-0 to file the complaint and stipulated order in the U.S. District Court for the District of Massachusetts, and on 5 December 2024 Magistrate Judge Paul G. Levenson entered the Stipulated Order for Permanent Injunction (Case No. 1:24-cv-12940). Evolv is permanently enjoined from making any unsubstantiated representation about weapons detection, ignoring harmless items, accuracy, false-alarm rates, screening speed, labor costs, testing, or “any material aspect of its performance, efficacy, nature, or central characteristics, including, but not limited to, the use of algorithms, artificial intelligence, or other automated systems or tools.”

The remedy with teeth is contractual: K-12 schools and districts that bought or contracted for Evolv Express between April 1, 2022 and June 30, 2023 must be notified — by email within seven days, in court-prescribed wording — of a 60-day right to cancel their multi-year contracts.

There is no monetary relief, and Evolv “disagrees with the FTC’s allegations, and has not admitted any wrongdoing.” Evolv’s own investor statement puts the exposure at approximately 237 Express units — about 4% of its 5,323-unit installed base as of June 30, 2024 — roughly $3.9 million of Annual Recurring Revenue, and about 8% of its customers.

Why this matters for buyers

This is a verified negative from the strongest posture in the honest-negative class: not an agency consent docket but a federal-court permanent injunction. Its lesson is the founding thesis of this site — an AI capability claim is worth exactly the evidence behind it. Evolv’s marketing claims about detecting “all weapons” ran for years across 800+ schools before a regulator forced the gap into the public record; the court’s remedy was to let the customers who bought on those claims walk away. Buyer diligence that demands substantiation per claim — accuracy, false-alarm rate, labor cost, each with a method and a measurement — is precisely what the injunction now compels from the vendor.

Verification record

Every figure above originates in the FTC’s filed complaint and press release, the court-entered stipulated order, or Evolv’s own investor-relations statement, each fetched live this session and matched to archived captures (the three PDFs byte-identical to their Wayback copies by SHA-1/CDX digest). Allegations are attributed to the FTC; Evolv’s no-admission posture and its counter-characterization are on record in the dossier. This story’s status is checking — it will never carry a green verified badge for a provider outcome; it is a cautionary record of one the market corrected.