1984—Pub. L. 98–616 inserted “Nothing in this chapter (or in any regulation adopted under this chapter) shall be construed to prohibit any State from requiring that the State be provided with a copy of each manifest used in connection with hazardous waste which is generated within that State or transported to a treatment, storage, or disposal facility within that State.”

1980—Pub. L. 96–482 prohibited construction of this chapter as barring a State from imposing more stringent requirements than provided in Federal regulations.