A paper cup complaint sample chain of custody records who controlled a sample, where it was stored, what happened to it and whether its condition changed. This helps distinguish production evidence from damage, contamination or mix-up introduced after collection.
This article adapts evidence-control principles for quality investigation; it is not legal advice or a forensic procedure. The responsible organization must define confidentiality, regulatory, safety and customer-handling requirements.
Diagnostic decision table
| Transfer risk | Control | Evidence retained |
|---|---|---|
| Identity mix-up | Unique case and item code | Label and photographs |
| Package opened | Tamper indication and opening record | Seal condition |
| Condition changes | Storage and transport controls | Receipt condition |
| Sample consumed | Approved test allocation | Remaining quantity |
Open the case before moving the sample
Assign a case number and an item identifier that cannot be confused with the production lot alone. Record who collected the cup, date and time, location, customer report, package condition and any visible change. Photograph all sides, labels and damage before cleaning or testing.
Separate customer statements from observations. Do not write an assumed cause into the sample description. If multiple cups, lids, bags or cartons arrive, identify each item and their relationship rather than treating the shipment as one undifferentiated sample.
Package and seal without altering evidence
Choose a clean enclosure that protects the suspected feature from crushing, abrasion, moisture, leakage or contamination. Mark the item and outer container. Use a tamper-indicating control where justified and record seal identity and condition.
Do not place wet or contaminated cups with clean comparison samples. Safety and food-contact concerns require appropriate handling by competent personnel. If cleaning, drying or disassembly is necessary, document the original condition first and authorize the change.
Document every custody transfer
For each transfer, record item, sender, receiver, date, time, location, purpose and condition. The receiving person should check identifiers, seal and quantity before acceptance. Electronic systems must retain attributable entries and corrections.
NIST defines chain of custody as tracking evidence through collection, safeguarding and analysis by documenting handlers, transfer times and purpose. A quality investigation is different from a legal case, but the same chronological discipline helps make complaint evidence reviewable.
Control testing and destructive allocation
Approve a test plan before consuming limited samples. Define which item supports visual review, dimensional checks, leak investigation, material analysis or comparison. Photograph setup and retain raw results, instrument identity and invalid-test reasons.
When a test changes or destroys the cup, record the remaining fragments and final package. Avoid repeating tests until a preferred answer appears. If supplier and customer laboratories divide samples, use traceable matched allocation and preserve transport conditions.
Close with disposition and retained records
Record return, continued storage, disposal or transfer of every item and remaining portion. Link custody history to lot genealogy, investigation, conclusions and customer communication. Protect customer identity and confidential artwork in stored images and records.
Send HANNAI the authorized sample evidence, production identity and test observations when machine review is appropriate. Chain of custody strengthens confidence in what was examined; it does not prove that one received cup represents the entire production lot.
Related equipment and next checks
Review the paper cup packing machine and the related guide to paper cup batch traceability and complaint investigation. The Engineering Notes archive connects these checks with wider machine planning.
Technical reference
- NIST chain of custody glossary — general reference; confirm applicability to the installed equipment.
Frequently asked questions
Must every transfer be documented?
Yes, record the handler, time, purpose, location and condition.
Can a complaint cup be cleaned before photographs?
Preserve and document the received condition first.
How are destructive tests controlled?
Approve allocation and record what remains after testing.
Does chain of custody prove lot representativeness?
No. Combine it with sampling, traceability and production records.
Review the evidence with HANNAI
Send your machine model, component identification and the observations described in this guide. Include the drawing or material reference and any before-and-after measurements so the required next check can be identified.