[Retrofitted]

Now that you said that... I can't find it, but I vaguely remember Google was working on some weird "echo location" (perhaps; I can only remember the mock-up) type thing YEARS ago that would allow them to track people and objects inside a building, like an internal GPS...

It's getting to the point I may never sleep again.

[who_would_fardels_bear]

I believe there was an important case where Scalia said that police couldn’t use evidence they gained by using such a system. That people should expect a certain level of privacy even if technology existed that could locate them to a particular place within their homes.