I am an american citizen and I had to take the lie detector. It's not that big of a deal, they only ask you about 4 or 5 questions, reworded several different ways. It is basically, have you ever been involved with the trafficking of drugs. Have you used illegal drugs in the last 5 years. Have you ever transported drugs. Something along those lines.
As a side note.......I wouldn't recommend working here anyways. Worst place I have ever flown. Has a lot of potential, but falls WAY short!!!