Season 3 Episode 13: Killer App
When Gillian tells Zach that his voice inflection indicates something about control, Zach rightfully dismisses this claim, comparing it to reading palms. While the voice does signal information about emotions, this example of what is called Voice Stress Analysis is not supported by research.
Lightman identifies an excellent example of the expression of contempt. This is the emotion in which the person showing the expression feels morally superior to the target of the expression.