(1) In general Subject to paragraph (2) and sections
2007 and
2009 of this title, this chapter shall not prohibit the use of polygraph tests on prospective employees by any private employer whose primary business purpose consists of providing armored car personnel, personnel engaged in the design, installation, and maintenance of security alarm systems, or other uniformed or plainclothes security personnel and whose function includes protection of
(A) facilities, materials, or operations having a significant impact on the health or safety of any State or political subdivision thereof, or the national security of the United States, as determined under rules and regulations issued by the Secretary within 90 days after June 27, 1988, including
(i) facilities engaged in the production, transmission, or distribution of electric or nuclear power,
(ii) public water supply facilities,
(iii) shipments or storage of radioactive or other toxic waste materials, and
(iv) public transportation, or
(B) currency, negotiable securities, precious commodities or instruments, or proprietary information.