Costco's Foreign Material & X-Ray Requirement, Explained
The 'fish bone' rule that pushed an industry toward X-ray — and what changed in 2025.
By PPI Technologies Group · · 9 min read
Key Takeaways
- Costco's addendum historically required a calibrated X-ray on finished product for most operations
- X-ray was favored because it detects bone, glass, stone, and dense plastic — not just metal
- The 2025 V3.0 update broadened it to a 'foreign material detection system' you must justify with evidence
- Specific raw commodities (whole eviscerated fish, whole muscle meats, shell eggs, etc.) are exempt
- Missing a device or valid exemption by your anniversary audit is an automatic audit failure
Why everyone calls it the 'fish bone' rule
Costco's Foreign Material Control expectations leaned hard on X-ray because X-ray detects what metal detectors physically cannot — bone fragments, glass, stone, and dense plastics. For seafood, poultry, and meat suppliers, bone is a leading complaint, and only X-ray reliably finds it. That single capability is why so many suppliers associate the Costco requirement with catching bones.
What the addendum has required
Historically: all manufacturing operations must have a properly installed and calibrated X-ray detection device for finished product, unless an exemption applies. If product density or composition makes X-ray ineffective, the operation needs a metal detector plus a letter from a subject-matter expert confirming X-ray isn't applicable.
Who is exempt
Commonly exempted from the device requirement:
- Shell eggs, whole raw agricultural commodities, and whole roasted coffee beans
- Whole muscle meats; whole or portioned in-shell crab; whole lobster tails
- Whole, eviscerated fish; hand-portioned fish fillets; peeled/de-headed shrimp
- Packaging products
- Operations using an appropriately sized physical barrier (screen, filter, sieve) placed just before packaging
Exempt operations still have to maintain current Good Manufacturing Practices and prerequisite programs to control foreign material, and barrier users must run documented integrity checks at a defined frequency.
What changed with the 2025 V3.0 Addendum
The V3.0 Addendum (auditable from September 1, 2025) reframed the requirement. Instead of mandating X-ray specifically, it requires a foreign material detection system — metal detection, X-ray, sieves, optical sorter, etc. — choosing the most effective solution for your product and process. Critically, suppliers must justify that choice with documented scientific and technical evidence: expert recommendations, scientific literature, regulatory guidance, and validation studies. A verbal 'an expert told us' is explicitly not enough.
Challenge testing is non-negotiable
Devices must have a rejection mechanism that segregates rejects, and you must run documented challenges: at the start and end of each production day/shift, at intervals of two hours or less during the run, at batch changes, at machine-setting changes, and after downtime for repairs. Where metal detection is used, challenge with Ferrous, Non-Ferrous, and Stainless Steel test pieces.
Practical read for a co-packer
A co-packer running diverse SKUs for a Costco program installs X-ray on finished retail packs as the broadest single solution — it covers metal, glass, stone, bone, and dense plastic, and doubles as a fill/quality check. For a dry, non-foil SKU where X-ray adds little, they document a metal-detection justification under V3.0 instead. Both are defensible; both are evidenced.
Bottom line
Treat the Costco addendum as a floor, not a ceiling. Pick the detection technology that genuinely best controls your hazards, document why with real evidence, run disciplined challenge tests, and make sure a device or valid exemption is in place before your anniversary audit — because the alternative is an automatic failure.
Equipment for this topic
Machines and brands we supply that apply to what you just read.
- PSG X-Ray 4280D — PSG X-Ray · X-Ray: Dual-energy X-ray inspection system for enhanced material discrimination — detects glass, stone, bone, dense plastics, and metal contaminants.
- PSG X-Ray 4500DP — PSG X-Ray · X-Ray: High-performance dual-perspective X-ray inspection — two viewing angles eliminate blind spots for maximum detection coverage.
- PSG X-Ray 2500PH — PSG X-Ray · X-Ray: Compact X-ray inspection system for small to medium products — high-resolution imaging for precise contaminant detection.
- PSG X-Ray 6500D — PSG X-Ray · X-Ray: Large-format X-ray inspection system for bulk products, large packages, and case-level inspection before shipping.
Browse the full line-up
- PSG X-Ray — X-Ray Inspection
- Inspection & Quality Control — All 23 machines
Buyer's guide: X-Ray Inspection Systems
Sources & Further Reading
- Costco Addendum V3.0 (2025) — Costco Wholesale Food Safety addendum
- Costco Foreign Material Control letter — Foreign material detection requirements
- Costco Food Safety & Quality Audit Expectations — Audit expectations document
Frequently Asked Questions
Does Costco require X-ray inspection?
Costco's food safety addendum requires robust foreign-material controls, and for many product categories that effectively means X-ray inspection. Always verify the current addendum for your specific category.
What contaminants does Costco's requirement target?
Physical or foreign material in finished product — such as metal, glass, stone, hard plastic, and bone.
How do I become compliant for Costco?
Install validated detection (often X-ray), document a HACCP/foreign-material program, and keep inspection records. We can help spec compliant equipment.
Keep reading
- X-Ray vs Metal Detection: Which Foreign Object System Fits? — Two technologies, very different capabilities — here's how to choose.
- FSMA 204: What the Food Traceability Rule Means for Packaging — Why your coding, labeling, and records need to talk to each other.