of an offense under the Controlled Substances Act ( 21 U.S.C. 801 et seq.), the Controlled Substances Import and Export Act ( 21 U.S.C. 951 et seq.), or any offense deriving its penalties therefrom to ensure that the guidelines and policy statements are consistent with the amendments made by this title. (b) Considerations In carrying out this section, the United States Sentencing Commission shall consider— (1) the mandate of the United States Sentencing Commission, under section 994(g) of title 28, United States Code, to formulate the sentencing guidelines in such a way as to minimize the likelihood that the Federal prison population will exceed the capacity of the Federal prisons