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Check out this article. Lie-detector glasses offer peek at future of security It's about a voice technology that tells if you're speaking true. What appears to be new and significant is that the sensors can be embedded into a pair of sunglasses, flashing for the wearer what's the fact or fiction of the person they're looking at. Shown at the latest CES in Las Vegas, it gives a green, yellow or red LED for true, maybe or false.
They also have a software program for a Pocket PC that links into your phone and tells you if the person you're listening to is in love with you. A portable Love Detector.
So, questions: Do you have a right to lie outside of a courtroom? Do you have a right to privacy regarding your feelings? Is this Big Brother? What sort of damage can this do in the hands of someone's little brother?
I suspect there's no effective way to prevent people from trying to use of this sort of technology as well as the future availability of this stuff in small, portable (and concealable) devices. More than likely, we'll see the development of devices to both detect them and if necessary, defeat them. When you have smarter mice (rats?) you have to build smarter mouse traps.