We’re not too sure just how accurate the Spion Portable Lie Detector is when put to use, but it helps weed out truths from lies by using voice tension technology that is able to measure different degrees of vibration in one’s voice. These vibrations occur whenever one goes from a state of calm to being a little bit more nervous. Apparently, the device has been tested enough behind closed doors to prove to be rather accurate in nature, and of course this works best when used with questions that elicit “Yes” or “No” answers. The Spion Portable Lie Detector can be purchased for $79.95, where wives and girlfriends might want to nab this to confirm/debunk any suspicions they have of their other half.