19 U.S. Code § 1583 - Examination of outbound mail
For purposes of ensuring compliance with the Customs laws of the United States and other laws enforced by the Customs Service, including the provisions of law described in paragraph (2), a Customs officer may, subject to the provisions of this section, stop and search at the border, without a search warrant, mail of domestic origin transmitted for export by the United States Postal Service and foreign mail transiting the United States that is being imported or exported by the United States Postal Service.
Mail not sealed against inspection under the postal laws and regulations of the United States, mail which bears a Customs declaration, and mail with respect to which the sender or addressee has consented in writing to search, may be searched by a Customs officer.
Notwithstanding any other provision of this section, subsection (a)(1) of this section shall not apply to mail weighing 16 ounces or less sealed against inspection under the postal laws and regulations of the United States.
 See References in Text note below.
The Customs laws of the United States, referred to in subsec. (a)(1), are classified generally to this title.
The Export Administration Act of 1979, referred to in subsecs. (a)(2)(D) and (c)(1)(G), is Pub. L. 96–72, Sept. 29, 1979, 93 Stat. 503, as amended, which is classified principally to section 2401 et seq. of Title 50, Appendix, War and National Defense. For complete classification of this Act to the Code, see Short Title note set out under section 2401 of Title 50, Appendix, and Tables.
The International Emergency Economic Powers Act, referred to in subsecs. (a)(2)(F) and (c)(1)(I), is title II of Pub. L. 95–223, Dec. 28, 1977, 91 Stat. 1626, as amended, which is classified generally to chapter 35 (§ 1701 et seq.) of Title 50, War and National Defense. For complete classification of this Act to the Code, see Short Title note set out under section 1701 of Title 50 and Tables.
Section 2332a(b) of title 18, referred to in subsec. (c)(1)(B), does not define the term “weapon of mass destruction”. However, that term is defined elsewhere in that section.
The Trading with the Enemy Act, referred to in subsec. (c)(1)(J), is act Oct. 6, 1917, ch. 106, 40 Stat. 411, as amended, which is classified to sections 1 to 6, 7 to 39 and 41 to 44 of Title 50, Appendix, War and National Defense. For complete classification of this Act to the Code, see Tables.
Rule 41 of the Federal Rules of Criminal Procedure, referred to in subsec. (c)(2)(A), is set out in the Appendix to Title 18, Crimes and Criminal Procedure.
A prior section 1583, acts June 17, 1930, ch. 497, title IV, § 583, 46 Stat. 748; Aug. 2, 1956, ch. 887, § 4(c), 70 Stat. 948, related to delivery and certification of manifest, prior to repeal by Pub. L. 103–182, title VI, § 690(b)(9), Dec. 8, 1993, 107 Stat. 2223.
2004—Subsec. (c)(1). Pub. L. 108–429 realigned margins.
For transfer of functions, personnel, assets, and liabilities of the United States Customs Service of the Department of the Treasury, including functions of the Secretary of the Treasury relating thereto, to the Secretary of Homeland Security, and for treatment of related references, see sections 203(1), 551(d), 552(d), and 557 of Title 6, Domestic Security, and the Department of Homeland Security Reorganization Plan of November 25, 2002, as modified, set out as a note under section 542 of Title 6.