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WiFi routers can see people through walls
(www.zmescience.com)
This is a most excellent place for technology news and articles.
It's obvious that the technology exists with highly specialized and extremely expensive equipment that can only be sourced by the military.
The reason why this is more concerning is that it's being done with off the shelf hardware that's already distributed ubiquitously in every home and connected to the internet making it hackable.
I hope that clarifies why this is not comparable to pre existing military technology.