Subpart A. Subpart A—General Provisions

• § 145.1 - Definitions.
• § 145.2 - Mail subject to Customs examination.
• § 145.3 - Opening of letter class mail; reading of correspondence prohibited.
• § 145.4 - Dutiable merchandise without declaration or invoice, prohibited merchandise, and merchandise imported contrary to law.
• § 145.5 - Undeliverable packages.