Section 1506, Pub. L. 100–690, title I, § 1009 , Nov. 18, 1988 , 102 Stat. 4188 ; Pub. L. 103–322, title IX, § 90208(a) , Sept. 13, 1994 , 108 Stat. 1995 ; Pub. L. 105–20, § 2(b) , June 27, 1997 , 111 Stat. 234 ; Pub. L. 115–271, title VIII, § 8203(a)(3) , Oct. 24, 2018 , 132 Stat. 4111 ; Pub. L. 116–74, § 2(c)(1)(A)(i)(III) , Nov. 27, 2019 , 133 Stat. 1157 , repealed this subchapter, and the amendments made by this subchapter, except for section 1007, effective Sept. 30, 1997 . Amendment by Pub. L. 115–271 , which added another exception for sections 1021 to 1035 of Pub. L. 100–690 ( 21 U.S.C. 1521 to 1535), and which was not given effect because those sections had not been treated as repealed in light of Pub. L. 105–20, § 2(b) , was subsequently repealed by Pub. L. 116–74 . Section 1507, Pub. L. 100–690, title I, § 1010 , Nov. 18, 1988 , 102 Stat. 4188 ; Pub. L. 105–20, § 2(b) , June 27, 1997 , 111 Stat. 234 , defined terms for purposes of this subchapter. See section 1701 of this title . Section 1508, Pub. L. 100–690, title I, § 1011 , Nov. 18, 1988 , 102 Stat. 4189 ; Pub. L. 103–322, title IX, § 90206 , Sept. 13, 1994 , 108 Stat. 1995 ; Pub. L. 105–20, § 2(b) , June 27, 1997 , 111 Stat. 234 , authorized appropriations to carry out this subchapter. See section 1711 of this title . Statutory Notes and Related Subsidiaries Effective Date of 2019 Amendment Amendment by Pub. L. 116–74 effective as if included in the enactment of subtitle K of title VIII of Pub. L. 115–271 , see section 2(c)(2) of Pub. L. 116–74 , set out as a note under section 1522 of this title . Effective Date of Repeal Repeal effective Sept. 30, 1997 , see section 1009 of Pub. L. 100–690 , which was formerly classified to section 1506 of this title .