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From that same NG show, an interesting response from an expert polygrapher:
GRACE:
Now, explain to me how you`re fitting that together because no one was telling us whether she had taken the second polygraph or not. But I know this much. And you can back me up on this, Mark Smith, joining us out of New York -- he`s a polygraph expert, VP of New Jersey Polygraphists.
Mark, police don`t want a second polygraph if you pass the first one with flying colors. I mean, there`s no police manual or procedure that says that, but in my experience with police, once you pass the first polygraph with flying colors, they don`t drag you back down to the station for a second poly. Would you agree with that analysis?
MARK SMITH, POLYGRAPH EXPERT:
Typically, that`s true. Something may have come up, new information after the first polygraph, and they want to follow up on that.
GRACE: Well, in my mind, Mark, you`re right. That`s looking at it extremely optimistically.
http://transcripts.cnn.com/TRANSCRIPTS/1006/29/ng.01.html
So maybe they just need more information from MR .....
Maybe. And if so, that makes it even more important for him to agree to take one, imo.
I agree wholeheartedly with Mark Klass, who always advises the parents and family members to TAKE A POLY so you can clear yourself and allow LE to move on to greener pastures. JMO