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your local swat team is probably equipped with "wall penetrating radar" which they use to assess the situation before entering a building. There are acoustic v
by willvarfar 10y ago
your local swat team is probably equipped with "wall penetrating radar" which they use to assess the situation before entering a building.
There are acoustic versions and they also thread fiber optic cameras under your door, so passive systems that image a building from the emissions in the building are probably something they'd buy too.