For better or worse, AI can now figure out what you’re doing even without “seeing” you [medium.com]. The MIT Computer Science & AI Lab (CSAIL [mit.edu]) has unveiled a neural network model that can detect human actions through walls or in extremely dark places.
Using RF in the "WiFi" bands. 25 hours of data was all it took ( / all they collected ) to train and test.
Now you can be monitored for depression even with the blinds closed, lights off, and without an interview [mit.edu].
Article was unclear if the WiFi RF used was active, or passive [hindawi.com].