Startup Idea: Voice Stress Analyzer Mobile App

Startup idea to develop a certified voice stress analyzer or lie detector application for smartphones. The app should be of a professional grade, not novelty, with the user willing to pay up to $800 for it.

Yes, I would like to have a voice stress analyzer on my smartphone. Something like a lie detector. I would use it on my wife. Something like this I would expect to cost tons of money. I would be willing to $800 for it. Only if it is certified, I do not want any novelty garbage. This may sound silly, but I really need something like this. I am dead serious. God Bless.