SB478

Senate Bill 478, titled the 'Arkansas Diesel Engine Freedom Act of 2025,' seeks to prohibit state entities from enforcing federal regulations that require the use of diesel exhaust fluid for diesel engines operated exclusively within Arkansas. The bill asserts that federal mandates regarding such equipment, when applied to purely intrastate commerce, exceed the constitutional authority of the United States government. It declares that the manufacture, sale, and operation of 'exempt engines' that do not require diesel exhaust fluid are lawful within the state. Furthermore, the legislation establishes civil penalties for state entities that attempt to enforce federal diesel regulations on these engines. Violating state agencies or political subdivisions would face a 12-month suspension of their authority to enforce vehicle emission laws, and public officials or employees involved in such enforcement would be subject to termination and a five-year ban from public service.