CFR›Title 21›Chapter I›Part 100›Subpart A ContainsSections 100.1–100.2CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart A—State and Local Requirements Sections 100.1 § 100.1 Petitions requesting exemption from preemption for State or local requirements. 100.2 § 100.2 State enforcement of Federal regulations. Next F Subpart F—Misbranding for Reasons Other Than Labeling