Home › CFR › Title 21 › Part 80821 CFR Part 808 — Exemptions from Federal Preemption of State and Local Medical Device RequirementsSubpart A — General Provisions§ 808.1— Scope.§ 808.3— Definitions.§ 808.5— Advisory opinions.Subpart B — Exemption Procedures§ 808.20— Application.§ 808.25— Procedures for processing an application.§ 808.35— Revocation of an exemption.Subpart C — Listing of Specific State and Local Exemptions§ 808.55— California.