108
Opinion of the Court
If the State wishes to enact a dual impact law that regulates an occupational safety or health issue for which a federal standard is in effect, § 18 of the Act requires that the State submit a plan for the approval of the Secretary.
IV
We recognize that "the States have a compelling interest in the practice of professions within their boundaries, and that as part of their power to protect the public health, safety, and other valid interests they have broad power to establish standards for licensing practitioners and regulating the practice of professions." Goldfarb v. Virginia State Bar, 421 U. S. 773, 792 (1975); see also Ferguson v. Skrupa, 372 U. S. 726, 731 (1963); Dent v. West Virginia, 129 U. S. 114, 122 (1889). But under the Supremacy Clause, from which our pre-emption doctrine is derived, " 'any state law, however clearly within a State's acknowledged power, which interferes with or is contrary to federal law, must yield.' " Felder v. Casey, 487 U. S., at 138 (quoting Free v. Bland, 369 U. S. 663, 666 (1962)); see also De Canas v. Bica, 424 U. S. 351, 357 (1976) ("[E]ven state regulation designed to protect vital state interests must give way to paramount federal legislation"). We therefore reject petitioner's argument that the State's interest in licensing various occupations can save from OSH Act pre-emption those provisions that directly and substantially affect workplace safety.
We also reject petitioner's argument that the Illinois licensing acts do not regulate occupational safety and health at all, but are instead a "pre-condition" to employment. By that reasoning, the OSHA regulations themselves would not be considered occupational standards. SARA, however, makes clear that the training of employees engaged in hazardous waste operations is an occupational safety and health issue, and that certification requirements before an employee may engage in such work are occupational safety and health standards. See supra, at 92. Because nei-
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