Tamper-evident packaging does not stop anyone from opening a shipment. It makes sure that if someone does, the evidence is visible. For legal originals, medical specimens, aircraft parts, storage media, and anything holding personal information, that evidence is what turns a worry into something you can act on. This guide explains how tamper-evident packaging works, which methods suit which shipments, how to record and check seals, and what to do when one is broken.
Quick answer
- Tamper-evident means that opening leaves visible evidence. It is different from tamper-resistant, which means hard to open, and no packaging is truly tamper-proof.
- A seal is only useful if its serial number is recorded at pickup and compared at delivery.
- Common methods include void tape, serial-numbered plastic seals, tamper-evident bags, and signed security labels. The right one depends on the contents and the risk.
- If a seal is broken or does not match, stop, document, and report before opening anything.
Evident, Resistant, Proof: Know the Difference
| Term | What it means | What to expect |
|---|---|---|
| Tamper-evident | Opening or interfering leaves visible, hard-to-hide evidence | It will not stop a determined person, but it will show that they tried |
| Tamper-resistant | Designed to be hard to open without tools or force | It slows access, and is often combined with an evidence feature |
| Tamper-proof | A marketing term, since nothing is truly proof against a determined attempt | Treat the claim with caution |
Common Methods
| Method | How it shows tampering | Typical use |
|---|---|---|
| Void or security tape | Leaves a pattern or message if peeled, and cannot be neatly reapplied | Boxes, cases, and envelopes |
| Serial-numbered plastic seals | Must be cut or broken to open, and the number is recorded | Bags, totes, and cases with a hasp |
| Tamper-evident bags | A sealed strip with a serial number that shows if it has been opened | Specimens, documents, and storage media |
| Signed security labels | Signature or initials across the seal, so that any lifting disturbs it | Envelopes and small parcels |
| Bolt and cable seals | High-strength seals for containers and truck doors | Freight, with classification under the ISO 17712 standard for container seals |
The ISO 17712 standard covers mechanical seals for freight containers in international trade, including tamper-evidence requirements. For ordinary courier shipments, the same principles apply on a smaller scale.
Seal Practice: What Makes It Work
- Record the serial number at pickup. On the paperwork, in the booking, and with the person who hands the shipment over.
- Apply it properly. A clean, dry surface, firm pressure, and no gaps. Poorly applied tape or a seal that is not fully locked proves nothing.
- Use each seal once. Never reuse a seal or a tape, and store unused seals securely so that numbers cannot be duplicated.
- Photograph it. A clear photo of the seal and the number at handover is cheap and useful.
- Check it on arrival. The recipient compares the number and inspects the seal before opening, then records the result.
Who Benefits Most
- Law firms and legal departments: originals and sensitive files, see our guide to secure document delivery.
- Medical and research teams: specimens and devices where handling must be documented.
- Aerospace suppliers: parts where serial numbers and paperwork must stay with the item.
- Anyone shipping electronic evidence or storage media: see our guide to electronic evidence and storage media.
- Organizations handling personal information: unauthorized access to personal information is among the things Québec's privacy law treats as a confidentiality incident, so evidence of tampering matters, see our guide to Law 25 and courier delivery.
What to Check on Arrival
- Is the seal present and intact, with no signs of cutting, lifting, or re-taping?
- Does the serial number match the paperwork?
- Does the packaging show damage, moisture, or signs of re-sealing?
- Is the number of pieces correct?
- Are the results of the check recorded on the delivery paperwork?
If a Seal Is Broken or Does Not Match
- Stop. Do not open or repack the shipment.
- Photograph the seal, the number, and the packaging from several angles.
- Write down what you see, with the time and the people present.
- Notify the shipper and the courier right away, using the contact you were given.
- Keep the packaging and seals as they are.
- Decide, with the shipper, whether the contents should be inspected, replaced, or quarantined.
Our claims guide explains how to document a problem, and our article on delivery verification covers the proof of delivery that goes with it.
The Limits of Tamper Evidence
A seal detects. It does not prevent. It works only when someone checks it, and a sophisticated attacker may defeat a cheap one. It works best as part of a system: a named recipient, a documented chain of custody, and a courier that you can reach. Use the level of protection that fits the risk, and do not give a false sense of security to a shipment that deserves more.
Frequently Asked Questions
What is the difference between tamper-evident and tamper-proof?
Tamper-evident packaging shows visible signs if someone opens or interferes with it. Tamper-proof is a marketing term, since nothing can be made proof against a determined attempt. Evidence is the realistic goal.
What should be written on the paperwork about a seal?
The seal's serial number, the date and time it was applied, who applied it, and the number of pieces. The recipient then records the number they find and the condition of the seal.
Who applies the seal, the shipper or the courier?
Usually the shipper, who knows the contents and records the number. Some jobs have the courier apply or check seals at pickup. Agree this when you book.
What should I do if the recipient finds a broken seal?
Stop, photograph the seal and packaging, record what is seen, and notify the shipper and the courier before opening. Keep the packaging as it is.
Do all shipments need tamper-evident packaging?
No. It is a risk-based choice. Use it where unauthorized access would matter, such as legal originals, specimens, aircraft parts, and anything with personal information.
Seal It, Record It, Check It
Tamper-evident packaging works when three things happen: the seal is applied well, the serial number is recorded at pickup, and someone checks it at delivery. Done together, they turn a shipment you hope arrived untouched into one you can show did.
Sealed and sensitive shipments are part of what Rush Expedited Courier handles, with dispatch around the clock. Tell us what you are sending in the quote form, and browse our courier services for the rest.
Sources and Further Reading
- BSI Knowledge: ISO 17712, freight containers and mechanical seals (2010 edition page, since superseded)
- LégisQuébec: Act respecting the protection of personal information in the private sector (P-39.1)