I saw a similar one once. http://www.nij.gov/journals/253/tracking.html http://www.nij.gov/journals/253/tracking.html It was extreme. It analyses voice, facial

I saw a similar one once. http://www.nij.gov/journals/253/tracking.html http://www.nij.gov/journals/253/tracking.html It was extreme. It analyses voice, facial gestures, fingerprints and a variety of biometrics. IMHO, using only voice signatures to identify stress levels can be a bit trivial. The causes for stress may vary and this system should be clubbed with facial gesture recognition for accuracy.