39 U.S.C. §§ 604-606 - Private Carriage of Letters

Customs enforces those provisions of the law which permit seizure and forfeiture of letters and bags, packets or parcels containing letters which are being carried contrary to law on board any vessel.

39 U.S.C. §§ 3002(a) - Nonmailability of Locksmithing Devices

Customs aids in the enforcement of this provision prohibiting the mailing of locksmithing devices except to certain statutorily recognized parties.

39 U.S.C. §§ 3005 - Conducting a Lottery through the Mails

Customs aids in the enforcement of this provision which prohibits the mailing of schemes or devices for obtaining property or money and specifically conducting a lottery through the mails including prohibition of interstate mailing of tickets.

39 U.S.C. §§ 3008, 3010 - Pandering of Sexually Oriented Advertisements

Customs aids in the enforcement of these provisions which prohibit the mailing of pandering and sexually oriented advertisements without strict compliance with the stated requirements for such mailing and provide for the issuance of any order by the Postal Service to require the sender to refrain from sending such materials; disobedience is punishable by contempt of Court.