The lie detector you'll never know is there

"The US Department of Defense has revealed plans to develop a lie detector that can be used without the subject knowing they are being assessed. The Remote Personnel Assessment (RPA) device will also be used to pinpoint fighters hiding in a combat zone, or even to spot signs of stress that might mark someone out as a terrorist or suicide bomber."

"In a call for proposals on a DoD website, contractors are being given until 13 January to suggest ways to develop the RPA, which will use microwave or laser beams reflected off a subject's skin to assess various physiological parameters without the need for wires or skin contacts. The device will train a beam on "moving and non-cooperative subjects", the DoD proposal says, and use the reflected signal to calculate their pulse, respiration rate and changes in electrical conductance, known as the "galvanic skin response". "Active combatants will in general have heart, respiratory and galvanic skin responses that are outside the norm," the website says."

A peek into the future. If they succeed in getting such a product under developement and into use, expect it to eventually show up at a police department near you. Expect it to be used on a wide scale like video surellence camaras are now, that you find on public streets. Expect to find them in stores and banks, as a way to pick out potential shoplifters and robbers. Expect them to be used by employers during job interviews. Expect them to be placed in schools, And expect small hand-held models to be sold to the general public.