What should the seal around the knot of a firearm tag be made from?

The seal around the knot of a firearm tag should be made from a gummed label because it provides a reliable and tamper-evident seal. Gummed labels have adhesive properties that allow them to securely stick to the item being tagged, ensuring that if someone attempts to tamper with the seal, it will be visibly disrupted. This is crucial in maintaining the chain of custody for evidence in criminal investigations, as any breach in the seal could raise questions about the integrity and handling of the firearm.

In contrast, other materials like plastic wrap or sticky tape do not offer the same level of security or documentation. Plastic wrap may not adhere properly and can easily be removed without leaving any indication of tampering, while sticky tape can be peeled off and reapplied, posing similar risks to the integrity of the evidence. Twine, while it can be used for securing items, does not provide a tamper-evident feature, which is essential for maintaining the evidentiary value of the tag. Therefore, using a gummed label for sealing ensures both physical security and evidential credibility.