Swedish defense researchers trained an AI called WiFireNet to find hidden handguns from ordinary Wi-Fi signal data. Indoor tests with up to four people moving around reached 72.5 percent average precision for spotting a gun, 53.8 percent when also locating it on the person, and weaker results in unfamiliar rooms. They proved the idea on modified 1999 wireless gear, plan later tests on newer Wi-Fi 7 and 8 networks, published the software trained models and data, and critics warn the approach raises privacy issues because it needs little extra equipment and few rules exist.