[jlgreco]

If I understand this correctly, you would really be replacing one sort of motion detector with another.

The article is talking about phased array stuff, stuff you can't do with stock wifi equipment. All the regular wifi equipment is just providing the "light" the special receiver needs to see.

[hughes]

So really, it would make it impossible to get rid of motion detectors. You could never really be sure that one isn't nearby.