Now it is very easy to know whether someone is lying or telling a truth. Just hold your thumb on the scanning pad , wait for the scan to complete, and the app will attempt to determine the truth! Investigate the truth about things; get to know your true friends; find out who deceives you; Impress your friends! Fool your enemies. You can also set a custom response for truth and lie, so you can prank your friends. It is meant for entertainment purposes only.