CFR›Title 40›Chapter I›Part 258›Subpart A ContainsSections 258.1–258.9CorpusDaily eCFRDisplayed edition2026-06-08Last updated2026-06-08 Subpart A—General Sections 258.1 § 258.1 Purpose, scope, and applicability. 258.2 § 258.2 Definitions. 258.3 § 258.3 Consideration of other Federal laws. 258.4 § 258.4 Research, development, and demonstration permits. 258.5-258.9 §§ 258.5-258.9 [Reserved] Next Appendix I to Part 258 Appendix I to Part 258—Constituents for Detection Monitoring