Nothing in this chapter shall prohibit a State from adopting or enforcing supplemental or more stringent laws or regulations not inconsistent with this chapter, or criminal, civil, or administrative fines for violations of such laws or regulations.
(Pub. L. 104–272, § 22, formerly § 14, Oct. 9, 1996, 110 Stat. 3313; renumbered § 22, Pub. L. 106–210, § 4(1), May 26, 2000, 114 Stat. 322.)