I can understand your meaning- to do so , we should have database of voice or video apttern that can be detected as lying part.
More info can be discussed in chat.
Familiar interface and simple algorithm encourage your application.
1.Urgenfix.com- my last huge work for Taxi/Cab app - Towber
2.getheal.com- my work of medical app - heal
I have to meet the iOS / Android development for 5 years.
Image Processing with Camera dectection and OpenCV is also special point.
Special point in connecting devices with iphone such as apple watch , beacon , obd2 elm327 .. etc.
I am expert in Core Graphics, Uber ,Payment Integraton, ICloud , Social app , Voice Recognition , and
popular service like push notification ,local notification , geolocation , and beacon , coredata, qr code and etc.
Also extremely understanding MapBox and Google Map API.
I want your answer, further, I want a long -term relationship with you.
Best regards.