Fingerprint Polygraph app brings the surprising test to prank and shock your friends with truth and lie detection simulation. You can amaze your friends with this hilarious and incredible Polygraph simulation app. The tricky way to show truth and lie on the screen is to use the volume key up and volume key Down button, press volume key up for "Truth" and volume key down for "Lie". The Trick is that let your friend hold the fingerprint for few seconds, the app will show detecting, simulate heart