"The purpose of this document is to provide guidance on the use of security seals for Federal Government personnel and for all domestic commercial organizations/entities that transport goods throughout the inter-modal cargo supply chain, including, but not limited to manufacturers, shippers, importers, consolidators, and freight forwarders. Subjects covered on the use of seals include: Role in protecting cargo; Selection of the correct seal for the application; Types of seals that are available; Identification markings to ensure seal uniqueness; Control during the life of the seal; Installation of seals on container or door; Inspection of seals during the shipping process; Container inspection; Removal of seals; and Disposal of seals. This guide provides information on the different types of security seals available for use in securing and controlling containers, doors, and equipment. While this guide is not intended as a precise procedure for developing a comprehensive seal control program, instead, the objective is to provide information and procedures that will support the development of a seal control program that will meet site-specific requirements."
Transportation Security Administration: http://www.tsa.gov/