Good article. The anonymous author maintains the professional silence of the "trick" even while castigating much of the way the polygraph is used. He/she also does a good job of pointing out examiner bias but also notes that the polygraph is highly effective in criminal investigation largely because people blindly believe in it.

I got a chuckle out of the one way mirror stories.  Very clever. A lot more use than the instrument itself.

One of the problems with using it widely in screening is that the percentage of the general population that understands the trickery increases and as it increases it reduces it's value in criminal investigations.

-Marty

Beech trees,

Well, for a profession dedicated to "The Truth" polygraphy utilizes a lot of deception in an effort, often successful, to psychologically condition receptivity.  It's universally agreed that if people didn't believe the polygraph worked. It simply woudn't work.  Given that, the task has always been to magnify the belief that it works otherwise it's just a multichannel worthless instrument.

Still, the one "trick" that you can't drag out of them kicking and screaming is that they depend on you lying on a control question all the while drawing your attention to it and suggesting anyone who did ....(whatever is specificed by the control)... is the type of person who would do ....(topic of relevant).  If they can't get you to lie to the control, the polygraph can't be scored.  And of course they *assume* you are lying to the control if you say "no" so it WILL be scored and God help you if your "no" was the truth.

This *trick* secrecy is so ingrained that there are CM research studies where they didn't even explain to the subjects how the CQT is scored. Useless research.

-Marty