1. Short title This Act may be cited as the Stopping Illicit Fentanyl Trafficking Act of 2023 or the SIFT Act of 2023 . 2. Fentanyl-related substances Section 202(c) of the Controlled Substances Act ( 21 U.S.C. 812 ) is amended— (1) by adding at the end of subsection (b) of Schedule I the following: (23) Isobutyryl fentanyl. (24) Para-Methoxybutyrylfentanyl. (25) Valeryl fentanyl. (26) Cyclopentyl fentanyl. (27) Para-Chloroisobutyryl fentanyl.