Yesterday, The Daily Beast revealed that Egan had, according to his lawyer Jeff Herman, passed a polygraph test.
DeMaio responded to the “vicious rumor” by taking a polygraph test, which he passed.
The polygraph, which uses a range of measurements including blood pressure, was patented by Leonarde Keeler in 1931.
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.