Lie Detector Prank is a prank app for fun purposes. Does your friend tells true or false? No more lies! HOW TO USE: 1 Place your index finger on the scanner panel, 2 Hold the finger while Lie Detector scans your fingerprint, 3 X-ray laser beam will scan your finger x-ray, 4 When analysis is complete, the Lie Detector will detect if your friend is telling the truth or a lie. DISCLAIMER: Lie Detector Prank is a prank, joke or simulate app.