The best way to prank your friends and family is to make them believe that you can tell whether they are telling the truth or lying. It is so fun to watch them believe that this app can detect whether they are telling the truth or not. 

This app is so simple and so fun to use. You just have to press the volume button when scanning. If you are scanning the fingerprint, you have to put your finger on the scanner. After that, the Lie Detector Test Prank will detect whether you say is true or not. You will be able to see the results.