[Satan]

Device that sensitive, bound to be bugs. And exploits. Also likely detectable, radar can also be shielded, tricked, etc.

As neat and proper as they may make it sound to be, it could very potentially be a waste against simple things. Love to get my hands on one, just to break and abuse. See just how falliable it could be. iirc they can do a similar thing with WiFi that allows them to map out rooms, maybe it was a theory. But it at least seems more solid than radio.