Startup Idea: Lie Detector Mobile Application

Startup idea to develop a software that can accurately detect dishonesty, functioning as a portable lie detector. The app would work in various contexts, such as business transactions, service evaluations, and social encounters, with an easily accessible system, possibly through mobile phones.

I am in the teaching field, but this idea is for work and outside of work. I would like to have software that can detect if another person is lying or not. It could be similar to the lie detector that I see on TV on police shows, but put into a cell phone or similar small object that a person can carry around. One should be able to turn it on without being detected, and it should work through fabric/clothing. It would be great in business transactions, when requesting household services, and on first dates!. No.