; the limited resources in the Federal criminal justice system should be used to protect society by incapacitating dangerous and violent offenders who pose a threat to public safety. The Federal judiciary has the expertise and is in the best position to sentence each offender and determine who should be sent to Federal prisons and the amount of time each offender should serve. 6002. Approval of certain prosecutions by Attorney General A Federal prosecution for an offense under the Controlled Substances Act, the Controlled Substances Import and Export Act, or for any conspiracy to commit such an offense, where the offense involves the illegal distribution or possession of a controlled substance in an amount less than that amount specified as a minimum for an offense under section 401(b)(1)(A) of the Controlled Substances Act ( 21 U.S.C. 841(b)(1)(A) ) or, in the case of any substance containing cocaine or cocaine base, in an amount less than 500 grams, shall not be commenced without the prior written approval of the Attorney General. 6003. Modification of certain sentencing provisions (a) Section 404 Section 404(a) of the Controlled Substances Act ( 21 U.S.C. 844(a) ) is amended— (1) by striking not less than 15 days but ; (2) by striking not less than 90 days but ; and (3) by striking the sentence beginning The imposition or execution of a minimum sentence . (b) Section 401 Section 401(b) of the Controlled Substances Act ( 21 U.S.C. 841(b) ) is amended— (1) in paragraph (1)(A)— (A) by striking which may not be less than 10 years and or more than and inserting for any term of years or for ; (B) by striking and if death the first place it appears and all that follows through 20 years or more than life the first place it appears; (C) by striking which may not be less than 20 years and not more than life imprisonment and inserting for any term of years or for life