505 U.S. 88 (1992).

A 1992 United States Supreme Court opinion in which the Court held that the Illinois license acts that provided for training, testing, and licensing of hazardous waste site workers were preempted by the Occupational Safety and Health Act of 1970 to the extent that they established occupational safety and health standards for training those who worked with hazardous wastes.

The Court reasoned that Congress enacted the OSH Act “to promote occupational safety and health while at the same time avoiding duplicative, and possibly counterproductive, regulation.” To achieve these goals, the OSH Act “established a system of uniform federal occupational health and safety standards, but gave States the option of pre-empting federal regulations by developing their own occupational safety and health programs.”

The Court concluded: “The design of the statute persuades us that Congress intended to subject employers and employees to only one set of regulations, be it federal or state, and that the only way a State may regulate an OSHA-regulated occupational safety and health issue is pursuant to an approved state plan that displaces the federal standards.”

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