Bruce Schneier linked to this article, the comments are here http://www.schneier.com/blog/archives/2009/10/using_wi-fi_to.html#comments http://www.schneier.com/

Bruce Schneier linked to this article, the comments are here http://www.schneier.com/blog/archives/2009/10/using_wi-fi_to.html#comments http://www.schneier.com/blog/archives/2009/10/using_wi-fi_to... . This is pretty obviously an outgrowth of the old body capacitance sensors used in monitoring secure areas. It would be pretty easy to spoof since it would also detect moving pieces of any conductors or electronic devices. For SAR they would only detect a person (or electronic device) that was moving; if you are pinned down, tough luck.