LVA Without Consent
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Uploader Comments (GreenwoodSO)
All Comments (5)
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I too have seen the 98% number kicked around in the CJ world, at which any fair minded person would have to scoff at least a little. As a cop, I've used polys with great success dozens and dozens of times, but with a keen understanding of their very real limitations. In my estimation they are just another interview/interrogation tool, which can be effective when used properly (within the limits of their capabilities). We tell our students very plainly- the term "lie detector" just isn't viable.
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The American Psychological Association: "There is no evidence that any pattern of physiological reactions is unique to deception."
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By the way, good job teaching students about the scientific failings of lie detectors. I always thought it was interesting that in Psychology text books that the polygraph was slated to have about 60% accuracy. In Criminal Justice texts, the same number that polygraphers themselves parrot - 98% - is represented.
Who are we to believe? Scientists who study human behavior under strict academic scrutiny, or people with self serving interests?
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Layered Voice Analysisby GreenwoodSO617 views
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8 speech AWARENESS with the BiosonicFFTby bioaudio1,263 views
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Computer Voice Stress Analyzerby NITVCVSA9,663 views
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Las Vegas Academy Theatre Movieby philipprose7,052 views
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Layered Voice Analysis (LVA).wmvby achieversindia325 views
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Death Without Consent Trailerby deathwithoutconsent3,354 views
I found more.
Search for "Eriksson & Lacerda 2007" on yahoo and click the first result. It is a journal article entitled, "Charlatanry in forensic speech science."
The authors conclude, "To sum up by saying that there is absolutely no scientific basis for the claims made by the LVA proponents is an understatement. The ideas on which the products are based is complete nonsense." Further, "No qualified speech scientist believes in this nonsense..."
Spread the knowledge.
youfailedx 3 years ago
Thanks- we'll definitely check that out for possible inclusion in the next offering of the Ethics in LE course.
GreenwoodSO 3 years ago
Independent university studies have been conducted that reveal the LVA as junk.
Search for "FINAL REPORT CIFA CONTRACT FA 4814-04-0011" on yahoo to see a study hosted on a university website.
"The findings generated by this study led to the conclusion the neither the CVSA nor the LVA were sensitive to the presence of deception or stress." p. 44
Dismiss this pseudoscience!
youfailedx 3 years ago
We posted these videos for discussion in a Lander University Ethics in Criminal Justice course, so the debatable nature of the science was a major part of the discussion. We also talked about some of the similar science (and problems) attendant to traditional polygraph testing. Thanks for your comment, especially the reference to the reports (I had not seen the jail setting research- thanks again).
GreenwoodSO 3 years ago