29 U.S.C. § 2009
Except as provided in subsections (a), (b), and (c) of section 2006 of this title, this chapter shall not preempt any provision of any State or local law or of any negotiated collective bargaining agreement that prohibits lie detector tests or is more restrictive with respect to lie detector tests than any provision of this chapter.
(Pub. L. 100–347, § 10, , 102 Stat. 653.)
Section effective 6 months after , except that rules and regulations shall be issued not later than 90 days after , see section 11 of Pub. L. 100–347, set out as a note under section 2001 of this title.