
Quote from: sackett on May 09, 2008, 08:09 AMNG1
The fact that many LEA's use the techniques mostly as a confession wedge, does not negate legitimate use for detection of deception. Many agencies with that mindset have changed to some form of voice analysis for a faster wedge. The PCASS seems to me to be the polygraph industry's answer to the challenge of VS.
In the private field we are have less interest in confession and thus less need to inflate expected accuracy, though many still do, as old habits are hard to break.
The fact that many anti's seem unwilling to grasp, is that there is a need for independent credability asscessments in our society. We can and should argue over who is to do them and how, but the need is there.
If polygragh were banned tomorrow, it would not change what I do, just how I do it. The credability asscessment that includes a psychophysiological component is more reliable than one which does not.

Quote from: sackett on May 08, 2008, 03:46 PMYes, but if you had the wisdom of george, cullen and others, you would know Pailryder, that anything which is not perfect and without error can not possibly be a scientific test; and therefore must be discarded by all humankind...
Sackett
QuotePolygraph Accuracy Almost a century of research in scientific psychology and physiology provides little basis for the expectation that a polygraph test could have extremely high accuracy. The physiological responses measured by the polygraph are not uniquely related to deception. That is, the responses measured by the polygraph do not all reflect a single underlying process: a variety of psychological and physiological processes, including some that can be consciously controlled, can affect polygraph measures and test results. Moreover, most polygraph testing procedures allow for uncontrolled variation in test administration (e.g., creation of the emotional climate, selecting questions) that can be expected to result in variations in accuracy and that limit the level of accuracy that can be consistently achieved.
Theoretical Basis The theoretical rationale for the polygraph is quite weak, especially in terms of differential fear, arousal, or other emotional states that are triggered in response to relevant or comparison questions. We have not found any serious effort at construct validation of polygraph testing.
Research Progress Research on the polygraph has not progressed over time in the manner of a typical scientific field. It has not accumulated knowledge or strengthened its scientific underpinnings in any significant manner. Polygraph research has proceeded in relative isolation from related fields of basic science and has benefited little from conceptual, theoretical, and technological advances in those fields that are relevant to the psychophysiological detection of deception.
Future Potential The inherent ambiguity of the physiological measures used in the polygraph suggest that further investments in improving polygraph technique and interpretation will bring only modest improvements in accuracy.
Quote from: sackett on May 08, 2008, 10:46 AMNG1
More properly you can only say, from your direct experience, the polygraph you took failed to accurately classify you. The polygraph industrial complex recognizes the problem with false positive results, but to significantly reduce them, would increase the false negative rate, a trade-off deemed unacceptable to LEA's.
Quote from: sackett on May 08, 2008, 03:46 PMYes, but if you had the wisdom of george, cullen and others, you would know Pailryder, that anything which is not perfect and without error can not possibly be a scientific test; and therefore must be discarded by all humankind...
Sackett


QuoteIt is difficult for any examiner to know exactly his own accuracy rate, as in so many cases ground truth is never resolved to a certainty. Like you, I would be inclined to view claims in excess of 95% as wishful bs. And, I have had my share of both confirmed false positives and false negatives.

Quote..........The polygraph industrial complex recognizes the problem with false positive results...........
Quote from: sackett on May 07, 2008, 11:43 AMQuote from: Anonymous000 on May 07, 2008, 10:58 AMSackett.... any comment on my last post?
What could I possibly say that would have any impact?
Sackett