Trump Signs HALT Fentanyl Act Into Law, Closing Loopholes on Chemical Variants

Became Public Law No: 119-26.

Signed by President.

Presented to President.

Motion to reconsider laid on the table Agreed to without objection.

On passage Passed by the Yeas and Nays: 321 - 104 (Roll no. 166). (text: 6/11/2025 CR H2625-2627)

Fentanyl-related substances are treated as Schedule I as of the law’s enactment date.

New “tweaked” fentanyl-like chemicals can be charged as illegal right away, affecting arrests, prosecutions, and supply.

Researchers with an existing Schedule I/II research registration can begin certain covered research 30 days after notifying the Attorney General.

University and medical teams can start approved categories of fentanyl-related research faster, instead of waiting through a longer registration change process.

Researchers without a Schedule I/II research registration can get a decision within 45 days after submitting a complete notice.

New research teams can get permission faster (or quickly learn they must defend their application), helping projects start sooner.

Attorney General issues rules to implement the Act (can be “interim” rules first).

People and institutions get clearer instructions on forms, security rules, site notices, and how the new system works in practice.

Justice Department Inspector General submits a report to Congress on the covered fentanyl research category.

Adds oversight on whether the faster research pathway is working and whether there are diversion risks.