If ultrasonic is being used http://alumni.media.mit.edu/~wiz/ultracom.html
gives some things to ponder.
This is an overview of what is known in general
http://www.securityartwork.es/2013/10/30/badbios-2/?lang=en
Here is a current thread
https://plus.google.com/app/basic/stream/z13tzhpzvpqyuzv1n23cz52wykrrvjjce
some very interesting posts there. Newest at the bottom. Crazy weird.
Spyware swag
http://www.latimes.com/world/worldnow/la-fg-wn-russia-g20-summit-gifts-spy-devices-20131029,0,1499023.story
I don't know what to make of this kind of news or reality. It's sad news. Not
my thing but it's hard to look away from the gore.