New tech that can see every movement in your house using your WiFi
Given how many devices we already have at home, the notion that someone could either cheaply hack or outrightly buy a device that could potentially use them to determine not only whether someone is inside, but locate them in the space, sounds more like a dystopian nightmare.
Of course, like all tech, it could be used for productive purposes, such as monitoring sick, elderly, children or even pets within the boundaries of the home to check in on them from a distance and/or determine whether they may need help.
It may also be used to detect intruders — a feature particularly handy in a large house or other properties, enhancing work of visual systems like CCTV, which could otherwise be disabled by criminals.
Nevertheless, in this particular case, privacy concerns are bound to outweigh potential benefits, what may give rise to technological countermeasures interrupting or isolating WiFi signal from penetrating walls and making its way out to unwanted guests.
Fortunately, it’s an early stage proof-of-concept rather than a market-ready solution, so it’s going to take some time before anybody puts together such a WiFi-spy scanner to sell it on Amazon. But the tech exist so three letter agency's like the NSA are 100% using it.