; and (ii) section 1308.43 of title 21, Code of Federal Regulations (or any successor regulations). (B) Attorney General to inform Secretary Within 30 days of receiving such a petition, the Attorney General shall forward a copy of the petition to the Secretary. (C) Determination procedure not precluded by filing of petition The filing of a petition under this paragraph shall not preclude the Secretary from making a determination and sending an evaluation under paragraph (1) or (2). (8) Rule of construction Nothing in this subsection shall be construed to preclude the Attorney General from transferring a substance listed in schedule I to another schedule, or removing such substance entirely from the schedules, pursuant to other provisions of this section and section 202. (9) Subsequent controlling of removed substance A substance removed from schedule I pursuant to this subsection may, at any time, be controlled pursuant to the other provisions of this section and section 202 without regard to the removal pursuant to this subsection. (10) Evaluations or studies The Secretary may enter into contracts or other agreements to conduct or support evaluations or studies of fentanyl-related substances. (11) Definition In this subsection, the term fentanyl-related substance means a fentanyl-related substance as defined in schedule I(e) of section 202(c). . 6. Past cases involving removed or rescheduled substances (a) Domestic cases Section 401(b) of the Controlled Substances Act ( 21 U.S.C. 841(b) ) is amended by adding at the end the following: (8) Past convictions involving fentanyl-Related substance (A) In general In the case of a defendant whose offense of conviction under this title involved a fentanyl-related substance (as defined in schedule I(e) of section 202(c) as of the date the offense was committed) that has since been removed from designation as a fentanyl-related substance for purposes of this title and has been placed on any schedule other than schedule I or II or has been removed from the controlled