While I'm excited by the impact on the health industry (among other things), I wonder how this will affect spying (whether it is government or otherwise). Then again, I am just paranoid.
NSA: heavy breathing intensifies
NSA: heavy breathing intensifies
You could feed it electromagnetic energy - but then all you really have is a smaller version of the Great Seal bug https://en.wikipedia.org/wiki/The_Thing_(listening_device). I wouldn't be surprised if those already exist in about this size and the paper linked to from the web page talks about several such devices (and how they are not as well suited for implantation).