SUBPART A—General Provisions (§145.1 to §145.5)
- 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.