Can Wi-Fi signals reveal hidden explosives?

It’s an unfortunate truth that weapons and explosives in public places are an increasing problem, with some schools in the US beginning to implement security checkpoints. But many of these technologies are bulky and expensive to set up, and require staff to operate. Now a new study has found a way to tap into a type of signal that’s already ubiquitous in many public places – plain old Wi-Fi.

Currently, detecting suspicious objects in bags and backpacks can require dedicated and costly equipment like surveillance cameras, X-ray machines and ultra-wide-band scanners. Sometimes bag checks are done manually, but this requires staff to be present and can invade the privacy of people passing through.

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Source: New Atlas