Who is telling the truth?

The Electric Shock Lie Detector, seems to be funny but it is a practical gizmo, assesses lie levels with great accuracy using a succession of five LEDs - green to red, that light up with the degree of lie. It collects the data with each question you ask. Then evaluates coming information with the previous one. This means the more questions asked the more likely you are to be caught and more the LEDs will light up. The moms can really use one! carefull kids!