S 331
Became law
Places all fentanyl-related substances under Schedule I of the Controlled Substances Act by defining them by chemical structure, and adjusts research registration rules for schedule I drugs.
Official title: HALT Fentanyl Act
Timeline each lane is a chamber; dates pull from congress.gov actions
House
Received
18-MAR-2025
On the calendar
09-JUN-2025
Passed
12-JUN-2025
Senate
Introduced
30-JAN-2025
Referred
30-JAN-2025
Approved by committee
27-FEB-2025
Reported
03-MAR-2025
On the calendar
03-MAR-2025
Passed
14-MAR-2025
President
Presented
08-JUL-2025
Signed
16-JUL-2025
Became law
16-JUL-2025
- Defines a fentanyl-related substance by structural modifications to the fentanyl molecule, and schedules any such substance in Schedule I unless it is already controlled or listed elsewhere
- Lets practitioners begin schedule I research after notifying the Attorney General, with a 30-day wait for those already registered and a 45-day deadline for action on new applicants
- Allows a single registration for related research sites in the same city or county, and skips a new inspection when a researcher adds a substance in the same or a higher schedule
- Raises federal penalties for fentanyl-related substances by adding them to the existing penalty provisions for fentanyl analogues, and requires the Attorney General to issue implementing rules within 6 months
Current. The Congressional Research Service's summary covers the bill's latest wording (Public Law, 17-JUL-2025).
CRS is the Library of Congress's nonpartisan research office. Read it on congress.gov- Judiciary Committee (Senate)
Crime and Law Enforcement
■ 24 R■ 6 D■ 1 I
24 Republicans
- Marsha Blackburn
- Katie Boyd Britt
- Shelley Moore Capito
- Susan M. Collins
- John Cornyn
- Ted Cruz
- Steve Daines
- Joni Ernst
- Lindsey Graham
- Chuck Grassley
- Josh Hawley
- Cindy Hyde-Smith
- James C. Justice
- John Kennedy
- Mike Lee
- Roger Marshall
- David McCormick
- Ashley Moody
- Pete Ricketts
- Mike Rounds
- Eric Schmitt
- Dan Sullivan
- Thomas Tillis
- Todd Young
6 Democrats
1 Independent
congress.gov page
Public Law (16-JUL-2025)
Engrossed in Senate (14-MAR-2025)
Reported to Senate (03-MAR-2025)
Introduced in Senate (30-JAN-2025)
Enrolled Bill
Senate: Cloture on the motion to proceed to the measure invoked in..., 82-12, 06-MAR-2025
Senate: Cloture on the measure invoked in Senate, 84-15, 13-MAR-2025
Senate: Passed Senate with an amendment, 84-16, 14-MAR-2025
House: On passage Passed, 321-104, 12-JUN-2025