Barry_C wrote on Nov 20
th, 2007 at 2:05am:
Have you missed the fact that polygraph isn't perfect? You're going to have errors on both sides. The question is how many "errors" (BI) do you catch with polygraph? It is well-documented that polygraph results in admissions or info the background process didn't or couldn't get.
The value of those admissions must also be weighed against the harm done to the many individuals who will inevitably be falsely accused of deception when reliance is wrongly placed on an invalid test:
https://antipolygraph.org/statements.shtml Quote:When one believes that polygraph, the background investigation, or psychological eval, etc, is going to catch all those who are not qualified, then there's a problem.
Agreed. No vetting system will be perfect.
Quote:This is just one data point. When the feds catch spies (and they do), nobody here jumps to argue for polygraph. Why then the reverse?
The Prouty case is one of many data points. While no evidence that Prouty committed espionage against the United States has been made public, spies who have fooled the polygraph include:
Would you care to name any American turncoats caught by the polygraph? I can only think of one who is credibly alleged to have been so caught:
Sharon Scranage, a CIA secretary who admitted to passing the identities of CIA employees to her Ghanaian boyfriend, who was an intelligence officer.
Quote:We in polygraph know we will catch some and we will miss some. We need to work on ways to catch more, and miss fewer. Remember, there is nothing after the polygraph in most situations, and, as I've posted elsewhere, if polygraph is even slightly better than chance (and it is), then we'll catch more than we miss.
It's not at all clear that polygraphy reliably works at better-than-chance levels of accuracy, especially when the person being "tested" understands that the "test" is a
pseudoscientific sham and
knows polygraph countermeasures. Comparing the list of spies who fooled the polygraph against the single spy who was arguably caught by it, it looks like you miss more than you catch.
It's high time that our government heeded the National Academy of Sciences' conclusion that "[polygraph testing's] accuracy in distinguishing actual or potential security violators from innocent test takers is insufficient to justify reliance on its use in employee security screening in federal agencies." The time to end our misplaced reliance on polygraph screening is now.