Interestingly in the paper they address this somewhat for alternatives they discarded. Since they are proposing an introspection engine it should also drown-out

Interestingly in the paper they address this somewhat for alternatives they discarded. Since they are proposing an introspection engine it should also drown-out the mic and cover the cameras. But then you still have the shock sensor that could record steps. I'm really inclined that a true power switch with introspection engine to verify things are really off is a better approach.