Police documents show that Ladewig took a polygraph exam on January 20 and the results were inconclusive.
Yesterday, The Daily Beast revealed that Egan had, according to his lawyer Jeff Herman, passed a polygraph test.
Plus, a private investigator who gave Van der Sloot a polygraph test tells Nadeau that “he thrived talking about Natalee.”
But the polygraph, along with regulary updated background checks, can call attention to other discrepancies.
They use the polygraph only for administrative investigations (such as internal affairs) and in certain pre-employment screenings.
We don't need a scholar, nor a polygraph, but rather a writer who'll be one of us.
Pentathol, scopolamine and the like; hypnotism and the polygraph.
All I want to do is tell the truth, and the only way you can know it is by the polygraph, as that is the only way you can know it.
When you took the polygraph, you were present during the polygraph examination of Frazier, were you?
The sheets which you receive are those of the copying-pen of the polygraph, not of the one with which I have written.
1794, "mechanical device for making multiple copies of something written or drawn," from Greek polygraphos "writing much," from polys "much" (see poly-) + graphos "writing," from graphein "to write" (see -graphy).
Meaning "instrument for recording several pulsations of the body at the same time" is 1871; first used as a lie detector 1921. Related: Polygraphy (1590s); polygraphic (1771).
polygraph pol·y·graph (pŏl'ē-grāf')
An instrument that simultaneously records changes in physiological processes such as heartbeat, blood pressure, and respiration.