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AntiPolygraph.org Message Board › Polygraph and CVSA Forums › Polygraph Procedure › PLCQT/ GKT/ Specific incident

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PLCQT/ GKT/ Specific incident (Read 3585 times)

suethem Very Senior User Offline Posts: 196 Joined: Apr 29^th, 2003	PLCQT/ GKT/ Specific incident Jul 12^th, 2003 at 11:57pm	Mark & Quote Quote Print Post
	anyone... I was under the misconception that GKTs were the only 'test' used in criminal investigations. Is the PLCQT used in criminal case type tests? ( It seems like it was used in the Molly Bish Case) Are specific incident and GKT the same?


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Marty Especially Senior User Offline Posts: 499 Joined: Sep 27^th, 2002	Re: PLCQT/ GKT/ Specific incident Reply #1 - Jul 13^th, 2003 at 12:23am	Mark & Quote Quote Print Post
	suethem wrote on Jul 12^th, 2003 at 11:57pm: anyone... I was under the misconception that GKTs were the only 'test' used in criminal investigations. Is the PLCQT used in criminal case type tests? Are specific incident and GKT the same? Yes then No. Nearly all polygraph tests in the USA are of the PLCQT flavor. GKT's can be used for specific incidence tests but rarely are unlike in Japan where the reverse is true. Japan, having started widespread polygraph forensic use later than the USA, trained it's examiners on GKT techniques, as they were more grounded in scientific theory and can be designed to reduce false positives to a fairly low level assuming sufficient test points. The problem with GKT's is they are not applicable to screening by their nature. -Marty

	Leaf my Philodenrons alone.
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orolan Especially Senior User Offline Posts: 363 Joined: Dec 25^th, 2002	Re: PLCQT/ GKT/ Specific incident Reply #2 - Jul 13^th, 2003 at 1:37am	Mark & Quote Quote Print Post
	suethem, An additional problem in using the GKT is the media. So much information is given to the public that it becomes difficult to properly formulate the needed questions. And if the LE agencies started to use "dis-information" to protect the details of crimes they would then be ostracized by that same media.

	"Most of the things worth doing in the world had been declared impossible before they were done." &&U.S. Supreme Court Justice Louis D. Brandeis
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suethem Very Senior User Offline Posts: 196 Joined: Apr 29^th, 2003	Re: PLCQT/ GKT/ Specific incident Reply #3 - Jul 13^th, 2003 at 7:53am	Mark & Quote Quote Print Post
	All... So when polygraphers say that they only do 'criminal investigative' polys, they are still using the PLCQT format- the same format that has been found to be invalid. Bad science and tricks- not much to brag about! No wonder they hate this site.


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orolan Especially Senior User Offline Posts: 363 Joined: Dec 25^th, 2002	Re: PLCQT/ GKT/ Specific incident Reply #4 - Jul 13^th, 2003 at 10:18am	Mark & Quote Quote Print Post
	suethem, You are correct. It makes no difference what the reason is for the PLCQT test, it's still flawed. The Molly Bish case with those 11 people failing is a classic example. For the benefit of the polygraphers on this board, I will point out that we don't know for a fact that the PLCQT was used, so I'm "speculating" in that respect. But the odds are pretty strong that it was used.

	"Most of the things worth doing in the world had been declared impossible before they were done." &&U.S. Supreme Court Justice Louis D. Brandeis
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