S. 331 · 119th Congress

Permanently classifies fentanyl-related substances as Schedule I controlled drugs

Official title: HALT Fentanyl Act1

§1What it does

Why this matters: A plain-English description of the bill as it was voted on, written by us from the official summary and text.

Drafted by AI from the public sources cited. Each sentence links to its source.

This law permanently places fentanyl-related substances, as a group, in Schedule I of the Controlled Substances Act, the category for drugs considered to have a high potential for abuse and no accepted medical use.2,3 Crimes involving these substances carry the same quantity thresholds and penalties as crimes involving fentanyl analogues, such as a 10-year mandatory minimum prison sentence for offenses involving 100 grams or more.3 It also creates an alternative registration process for research on Schedule I substances and eases some other registration rules for researchers, such as allowing one registration to cover related research sites in some cases.3

§2Status

StatusBecame law (Public Law 119-26).1
IntroducedJanuary 30, 2025
SponsorSen. Cassidy, Bill [R-LA]
Cosponsors31 cosponsors (6 Democratic, 24 Republican, 1 independent)
Official recordS. 331 on Congress.gov

§3How Congress voted

Why this matters: The official count.

House, June 12, 2025

On Passage: Passed — 321 yes, 104 no, 7 not voting.4

Senate, March 14, 2025

On Passage of the Bill: Bill Passed — 84 yes, 16 no.5