; or (ii) with respect to a particular person, which such person represents or intends to have a stimulant, depressant, or hallucinogenic effect on the central nervous system that is substantially similar to or greater than the stimulant, depressant, or hallucinogenic effect on the central nervous system of a controlled substance in schedule I or II. . 9. Amendment to the sentencing guidelines Section 2D1.1 of the Federal Sentencing Guidelines is amended, in Application Note 6 (Analogues and Controlled Substances Not Referenced in this Guideline) of the Commentary, by striking In determining the most closely related controlled substance, the court shall, to the extent practicable, consider the following: and inserting the following: In determining the most closely related controlled substance and the applicable guideline or drug equivalence, the court shall— (A) if Attorney General has provided guidance on the appropriate sentencing equivalency or ratio to a controlled substance that is referenced in the guidelines through publication in the Federal Register (whether such guidance is included in or separate from any notice of proposed temporary or permanent scheduling of such substance under section 201 of the Controlled Substances Act ( 21 U.S.C. 811 )), apply any such sentencing equivalency or ratio