GlossaryEN1 min readUpdated: Jun 26, 2026

Trailer security seals

When a trailer leaves the loading dock under seal, the security seal becomes the chain of custody's critical link.

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Last updated: 26 June 2026Published: 19 June 2025

Source: https://en.wikipedia.org/wiki/Security_seal

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Passar Hub: Everything on the new Swiss customs system

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Definition & Explanation

When a trailer leaves the loading dock under seal, the security seal becomes the chain of custody's critical link. Trailer security seals are tamper-evident devices – made of plastic or metal – fitted to the door locking mechanism; any forcible removal or bypass leaves visible, irreversible marks that cannot be concealed. Customs authorities worldwide accept properly affixed seals as evidence that a consignment has not been interfered with in transit; a missing or damaged seal typically triggers a more thorough physical examination. Each seal carries a unique serial number entered in the shipping documents, enabling full traceability from origin to destination. Conventional seals are passive by nature: they record unauthorized access after the fact rather than actively preventing it, which sets them apart from electronic seals (e-seals) capable of sending real-time alerts. In day-to-day freight operations, seal numbers are a mandatory entry on the CMR consignment note and the customs declaration.

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⚡ Current 2026

Passar Hub: Everything on the new Swiss customs system

Passar replaces E-dec and NCTS. Passar 1.0 (export) is live, Passar 2.0 (import) starts from Q2 2026. Roadmap, ePortal registration, deadlines and FAQ — all on one page.

Passar 1.0Passar 2.0 → Q2 2026Passar 3.0 → Q2 2027

Passar Hub →Declar Info

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Trailer security seals

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Related Terms

Inbound Trailer Seal Check

Seal Replacement

Inbound Trailer Check

Detection Systems for Cargo Cold Chain Theft

Trailer Inspection Drones

Customs seal

Passar Hub: Everything on the new Swiss customs system

Logistics knowledge straight to your inbox

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