CFR›Title 25›Chapter I›Part 166›Subpart A ContainsSections 166.1–166.4CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart A—Purpose, Scope, and Definitions Sections 166.1 § 166.1 What is the purpose and scope of this part? 166.2 § 166.2 Can the BIA waive the application of these regulations? 166.3 § 166.3 May decisions under this part be appealed? 166.4 § 166.4 What terms do I need to know? Next B Subpart B—Tribal Policies and Laws Pertaining to Permits