Serialized Security Tape: 5 Roles in Chain of Custody

Serialized security tape is the quiet workhorse of chain-of-custody documentation. A tamper-evident bag is only as reliable as the unique identifier printed on its closure, because that number connects a sealed package to the custody log, the transfer record, and the final courtroom exhibit. A bag that tears open or loses its serial number can compromise an entire case, which makes the tape the link between the physical seal and the written record, not an afterthought.

Why Serial Numbers Do More Than Identify a Bag

A serial number on the tape does two jobs at once: it gives each bag a unique identity, and it creates an anchor point for every custody entry. The chain of custody is the chronological record of who handled evidence, when, and why, and according to the Cornell Law School Legal Information Institute, the prosecution carries the burden of proving that the item presented in court is the same item collected at the scene.

Without a unique identifier, that's a harder burden to meet. The tape also shows tampering: peel it, and a void pattern or the word VOID stays behind. The serial number plus the void mark tells a handler two things at once: that this bag was opened, and that this is the exact bag in question.

What Serialized Security Tape Looks Like on a Tamper-Evident Bag

On a tamper-evident bag, serialized security tape appears as a closure strip or receipt tab, typically carrying:

• A unique sequential number or barcode

• A perforated tear-off receipt tab that mirrors the number on the bag

• A void adhesive that reveals physical tampering

• A writable block for initials, date, and case details

The receipt tab is the overlooked piece. When an officer seals a bag, the perforated tab comes off and attaches to the evidence log, and because it carries the same serial number as the bag, it's a physical backup: if the bag is later questioned, the tab matches back to the sealed item.

How Serialized Security Tape Supports Chain of Custody

1. Collection: the custodian places the item in the bag and seals the serialized tape

2. Documentation: the serial number goes on the custody form and the receipt tab comes off for the file

3. Transfer: each handoff records the same serial number, the date, and the receiver

4. Analysis: the lab logs the number when the bag is opened, then reseals in a new serialized bag if needed

5. Storage: the sealed bag sits in secure storage, its number linking the physical item to the inventory record

This sequence isn't required by law everywhere, but it reflects a common best practice, and the key is that the serial number stays consistent across every entry.

When every transfer references the same serial, there's less room for an undocumented opening, and a bag that arrives with a torn void seal or a missing number flags the problem before the evidence reaches a courtroom. The handling side of that discipline is covered in our guide to preventing evidence contamination.

Custody Failures That Serialization Helps Prevent

• Unrecorded transfers: the tape makes the bag identifiable, but the written log still needs discipline; the tape supports the process, it does not replace it

• Substitution: a unique serial makes swapping a similar bag hard to hide, because the number on the bag must match the log

• Lost documentation: receipt tabs and duplicate numbers give multiple copies of the identifier

• Undetected tampering: void-tape closures reveal peeling or lifting, and that visual signal prompts investigation

What to Look for in Serialized Security Tape and Evidence Bags

• Heavy-gauge, multi-layer polyethylene film that resists punctures and tears

• Permanent void-tape adhesive with a clear void message when lifted

• Readable serial numbers, sequential digits or barcodes that survive handling

• Perforated receipt tabs for a removable duplicate in the file

• Writable information blocks for initials, dates, and case numbers

• Anti-static options for electronic evidence, covered in depth in our anti-static evidence bags comparison

• Opaque or transparent construction, depending on privacy and visibility needs

For the wider selection framework across bag types, see our guide to choosing the right security bag.

One Supplier, One Custody Format

Alert Security Products manufactures tamper-evident security bags in the USA, and every line, bank deposit, evidence and chain of custody, anti-static evidence, confidential document, patient medicine, personal property, and mailer bags, can be ordered with serialized receipt tabs and void-tape closures.

Custom printing covers agency names, sequential numbering, barcodes, and case-specific text, so a department can standardize on one supplier and keep one consistent custody format across every evidence type; our security bag solutions page covers custom configurations.

The Number Is the Case

Serialized security tape earns its place one transfer at a time: a unique number at collection, the same number at every handoff, and a void message the moment anyone tries to get around it. Standardize the tape, discipline the log, and the chain of custody defends itself. Contact Alert Security Products to spec serialized closures for your evidence workflow, or request samples to compare formats side by side.

Frequently asked questions

What is serialized security tape and what role does it play in chain of custody?

Serialized security tape is a tamper-evident closure strip with a unique sequential number or barcode that links a sealed evidence bag to its custody log, transfer records, and courtroom exhibit. It gives each bag a unique identity and creates an anchor point for every custody entry, helping prove the item presented in court is the same item collected at the scene.

How does serialized security tape show tampering?

The tape uses a void adhesive that leaves a visible pattern or the word VOID behind if peeled or lifted. Combined with the unique serial number, this tells a handler that the bag was opened and identifies the exact bag in question.

What features should I look for in serialized security tape for tamper-evident bags?

Look for a unique sequential number or barcode, a perforated tear-off receipt tab mirroring the bag number, a void adhesive that reveals physical tampering, and a writable block for initials, date, and case details. The receipt tab is especially important because it provides a physical backup that can be attached to the evidence log.

Do I need receipt tabs on serialized security tape?

Receipt tabs are not always legally required, but they are a valuable backup. When an officer seals a bag, the perforated tab can be removed and attached to the evidence log with the same serial number, allowing the bag to be matched back to the sealed item if questioned later.

Can serialized security tape prevent all custody failures?

No, serialized security tape supports chain of custody but does not replace written discipline. It helps prevent unrecorded transfers, substitution, lost documentation, and undetected tampering, but handlers must still consistently record transfers and maintain logs.