CFR›Title 43›Subtitle B›Chapter II›Part 3832›Subpart D›43 CFR 3832.40 Citation43 CFR 3832.40CorpusDaily eCFRDisplayed edition2026-08-12Last updated2026-08-12 § 3832.40 Tunnel sites. Next 3832.41 § 3832.41 What is a tunnel site?