Nemesysco Ltd. has developed a new line of Voice Analysis Eyeglasses that provide data about the truthfulness of the person you are speaking to.
A chip built into the sunglasses uses 8,000 algorithms to analyze an incoming voice waveform. Results are projected onto the inside of the lens using green, yellow and red color codes to indicate a “true,” “maybe” or “false” response to a set of questions. Assessed parameters include deception, excitement, stress, mental effort, concentration, hesitation, anger, love etc. Vendor claims 98% accuracy.
For a different perspective, consult this link. That site questions the validity of polygraphy in general, and the link provides information on polygraph countermeasures, as well as suggestions regarding how to defeat voice stress analysis .
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I still think the most telltale sign of a lie is a person not looking you in the eyes.
A person’s pulse often accelerates during a lie as well.