Vocal DOD tech means using vocal analyser to analyse psychological factors of sound including tone, loudness, musical quality.
According to wiki, vocal analyser DOD tech is named "Voice Stress Analysis" or specifically "Layered Voice Test"(also from wiki). It is mainly used in airports and some insurance companies to detect lying. However, Deception blog has lots of articles indicating it doesn't work.
Unfortunately, I haven't found any other test equipments so famous like polygraph to analyse sound's psychfactor and detect lies. But we do see Lock("Lie to Me") used unfamiliar device to decompose subject's voice. What's that? I guess it won't be voice stress analysis software "X13-VSA".
Anyway, consulting expert might be a better choice. I've found one in Chine. Her name is Cuiling Zhang and her book(in Chinese) has lots of details of vocal lie detection esp. in Chapter 2.
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