Effective Date of 2018 Amendment Pub. L. 115–391, title IV, § 401(c), , 132 Stat. 5221, provided that: “This section [amending this section and sections 841 and 960 of this title], and the amendments made by this section, shall apply to any offense that was committed before the date of enactment of this Act [ ], if a sentence for the offense has not been imposed as of such date of enactment.”

Effective Date of 2000 Amendment Pub. L. 106–310, div. B, title XXXVI, § 3622(b), , 114 Stat. 1231, provided that: “The amendments made by subsection (a) [amending this section] shall take effect 1 year after the date of the enactment of this Act [ ].”