From another website, ostensibly posted by a police sergeant:
Please note that this is not legal advice, and per the forum rules I would suggest we stop offering opinions and ideas which border on such.
Please do not joke around about 'tricking' or trying to game a poly. Most of the techs who administer these exams are not very fond of that and doing so will almost certainly disqualify you from whatever you are trying to do. Without going into specifics, there are numerous sensors attached to you and unless the tech is completely green, they can reliably spot any of the classic 'tricks'.
On a personal note, I tend to agree with those who have a problem with the polygraph's use. I currently hold a fairly high-level government clearance (one that required a poly). A few years ago I got through all the interviews and was offered a job as an FBI agent. I made it through everything and then failed the poly, which was for a lesser clearance than the one I already have :glare: