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Scientists Use WiFi to See Through People's Walls
(www.popularmechanics.com)
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this post was submitted on 22 Jan 2024
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They bounce a laser off the glass and can hear what's happening in the room by capturing the vibrations of the glass. I seem to remember the US embassy was caught spying on the Canadian Prime Minister using this technique.
MIT used a high speed camera to reconstruct sound vibrations from objects behind soundproof glass, such as a bag of chips, water in a glass, and a plant. That was in 2014.
https://news.mit.edu/2014/algorithm-recovers-speech-from-vibrations-0804
Yep I have read that sensitive buildings are now built with a hallway ringing the building and offices further inside, so the rooms where classified things are discussed don't have windows accessible by outside lasers.