To contain such terrorism, USA instructs Department of Homeland Security (DHS) and Customs & Border Protection (CBP) to activate preventive security measures. Pushing Our "Zone of Security" Outwards. The introduction of Container Security Initiative!
Upon the deployment of the Container Door Seal, the Consignee must produce tangible evidence to CBP that the Container Door Seal has not been subjected to tamper or compromise in order to gain speedy, priority access, US CBP clearence, possibly without human inspection.
A Container entering into USA territory may have ample exposure possibilities to potential tamper and compromise during feeder service or at a transit point or Container deposit farm or even during the journey by skilful compromising or tampering of the Door Seal.