I was just thinking about how, once this technology is perfected, at how easy it will be to interrogate high value prisoners. Just pop one of these in their head, and tell them not to think about the top secret or incriminating stuff.
I'm not convinced a device to read your internal monologue from the outside is even possible, or if it is, it may be very, very large. A device that sees you're conducting one, perhaps, but reading out the contents externally? I'm not sure it could gather enough information and training data to ever decode it. (That is, my point is more information theoretic than technological.)
It's excerpted here if you don't want to read the whole book:
https://gizmodo.com/how-ghost-fleet-nails-the-perfect-vision...
once regime changes