This is a very interesting way to limit the radio field of the network used for authentication via transmission of the signal through flesh. I feel like making a Hell Raiser quite like "The flesh calls out for authentication". Cool stuff.
There have been some stories on this on sites. But, you should be able to buy it now via Japanese sites and there are re-shipping companies if someone really wanted these in the US to mess with. Email me if you want info on one. I'm trying to decide if I want to order a kit.
Japanese Kit Link: http://www.ntt.co.jp/news/news08/0804/080423a_2.html
NTT Starts Selling a Human Area Network Authentication Device