At this point reality television has become anything but. Why are there writing credits at the end of episodes?.. This show, a game show, with a simple concept says more about western civilization than The Real World or any of its reality show offspring.
Lie detector test results aren't completely accurate for all people and I was skeptical for that reason but the types of contestants shown so far have faces and mannerisms that read like open books.
Even if they beat the actual test on some questions, when they're in front of all those people and cameras, their expression's say it all. Under those circumstances is about the closest you'll get to finding out the truth.
Some questions will be too general and cause false negatives and vice versa, but in this day and age when a lot of people celebrate their depravity, a show like this might just wake a few people up before their Free-Vee's premier "The Running Man". I doubt it, though.