MO HB3515

Prohibits any state or local government entity or employee from enforcing federal laws, executive orders, regulations, or court orders governing the removal of emission control devices on diesel-powered vehicles

Covers 20 categories of diesel vehicles including commercial motor vehicles, buses, school buses, farm tractors, trucks, tow trucks, and recreational vehicles

Employers of violators are liable to injured parties in civil actions, with courts authorized to award attorney's fees and costs; sovereign and qualified immunity cannot be used as a defense

Entities employing federal officials who enforce these emission control regulations within Missouri face civil penalties of $100,000 per occurrence

Any Missouri resident or business may file a declaratory judgment action in circuit court against individuals believed to be violating this provision