Lie Detector Prank

Detector of lies and truth
It is a fun application that simulates detect lies through a fingerprint reader.
A user asks a question and the other person presses a finger on the fingerprint reader, after spending a few seconds will show the test results, if lying is displayed red and an error sound and if true will show green and a sound of success.
The operation is very simple, as it works alternately between truth and falsehood, ie pressing once will show true, and the second press will show up as false and so on.