The term “lie detector” includes a polygraph, deceptograph, voice stress analyzer, psychological stress evaluator, or any other similar device (whether mechanical or electrical) that is used, or the results of which are used, for the purpose of rendering a diagnostic opinion regarding the honesty or dishonesty of an individual.
29 U.S. Code § 2001. Definitions
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As used in this chapter:
(3) Lie detector
(4) PolygraphThe term “polygraph” means an instrument that—
records continuously, visually, permanently, and simultaneously changes in cardiovascular, respiratory, and electrodermal patterns as minimum instrumentation standards; and
Except as provided in subsection (b), this Act [enacting this chapter] shall become effective 6 months after the date of enactment of this Act [June 27, 1988].
Not later than 90 days after the date of enactment of this Act, the Secretary shall issue such rules and regulations as may be necessary or appropriate to carry out this Act.”