; and (B) publish in the Federal Register, not later than 18 months after the date of the determination under that paragraph, a final notice of the revision of the Mandatory Guidelines for Federal Workplace Drug Testing Programs to expand the list of substances authorized to be tested to include the substance or substances determined to be justified for inclusion. (3) Report If an expansion of the substance list is determined not to be justified under paragraph (1), the Secretary of Health and Human Services shall submit to the Committee on Commerce, Science, and Transportation of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives a report explaining, in detail, the reasons the expansion of the list of authorized substances is not justified. (b) Department of Transportation drug-testing panel If an expansion is determined to be justified under subsection (a)(1), the Secretary of Transportation shall publish in the Federal Register, not later than 18 months after the date the final notice is published under subsection (a)(2), a final rule revising part 40 of title 49, Code of Federal Regulations, to include such substances in the Department of Transportation's drug-testing panel, consistent with the Mandatory Guidelines for Federal Workplace Drug Testing Programs as revised by the Secretary of Health and Human Services under subsection (a). (c) Savings provision Nothing in this section may be construed as— (1) delaying the publication of the notices described in sections 8106 and 8107 of this Act until the Secretary of Health and Human Services makes a determination or publishes a notice under this section