SANTA ANA, Calif. - Federal law preempts a district attorney's California unfair competition law (UCL) action seeking civil penalties for violation of state workplace safety regulations because the state's federally approved workplace safety plan lacks such a remedy, an appeals court held Feb. 24 (Solus Industrial Innovations LLC, et al. v. The Superior Court of Orange Co., The People, real party in interest, No. G047661, Calif. App., 4th Dist., Div. 4).