; and (2) by inserting after subsection (f) the following: (g) Inadequacy of criminal history (1) In general If subsection (f) does not apply to a defendant because the defendant does not meet the requirements described in subsection (f)(1) (relating to criminal history), the court may, upon prior notice to the Government, waive subsection (f)(1) if the court specifies in writing the specific reasons why reliable information indicates that excluding the defendant pursuant to subsection (f)(1) substantially overrepresents the seriousness of the defendant’s criminal history or the likelihood that the defendant will commit other crimes. (2) Prohibition This subsection shall not apply to any defendant who has been convicted of a serious drug felony or a serious violent felony, as those terms are defined in section 102 of the Controlled Substances Act ( 21 U.S.C. 802 ). . II Corrections Reform 201. Parole for juveniles (a) In general Chapter 403 of title 18, United States Code, is amended by inserting after section 5032 the following: 5032A. Modification of an imposed term of imprisonment for violations of law committed prior to age 18 (a) In general Notwithstanding any other provision of law, a court may reduce a term of imprisonment imposed upon a defendant convicted as an adult for an offense committed and completed before the defendant attained 18 years of age if— (1) the defendant has served not less than 20 years in custody for the offense