A hemp ingredient lot that fails incoming inspection — because the COA shows total THC above the acceptable limit, because retesting produces an OOS result, because a contaminant panel comes back with a positive, or because documentation is missing or non-compliant — is not a theoretical event. It happens. How your organization handles it determines whether the event is contained and resolved cleanly or whether it creates cascading compliance, operational, and legal problems.
This article provides a step-by-step protocol for handling a failed hemp ingredient lot in the post-November 12 compliance environment.
Step 1: Quarantine the Lot Immediately
The first action on a lot failure is quarantine. The lot must be physically separated from approved inventory, clearly labeled as "QUARANTINED — DO NOT USE," and access-restricted to authorized quality personnel only.
Why immediate quarantine matters: In a busy production environment, a quarantine action that is delayed by hours can result in the failed lot being inadvertently incorporated into production. Once a failed ingredient is in a finished product, the problem is substantially more expensive to resolve — now you're managing a potential product recall rather than an ingredient return.
Quarantine documentation: The quarantine action should be documented immediately, including: the date and time of quarantine, the lot number and quantity quarantined, the reason for quarantine (initial COA failure, retest failure, documentation non-conformance), and the name of the person who initiated the quarantine. This documentation initiates the formal deviation record.
Step 2: Verify the Failure
Before taking further action, confirm that the failure is real and accurately characterized:
For a COA-based failure (total THC above acceptable limit):
- Confirm that you're using the correct formula: Total THC = delta-9 THC + (THCA x 0.877)
- Verify the units are consistent (% by weight vs. mg/g — don't mix them)
- Confirm the serving size and servings per container calculation that converts the ingredient concentration to mg per container
- If the failure is borderline, confirm with your QA director whether retesting is appropriate before taking further action
For a retest failure (your incoming testing produces an OOS result different from the COA):
- Confirm your test method matches the COA method (HPLC vs. HPLC)
- Confirm your reference standards and calibration are current
- Document the discrepancy quantitatively: what did the COA say vs. what did you find?
For a documentation failure (missing DEA registration, GC-only testing, absent USDA attestation):
- Document specifically which documentation requirement was not met
- Determine whether missing documentation can be provided quickly by the supplier or whether the absence reflects a fundamental qualification gap
Step 3: Notify the Supplier
Once the failure is verified and documented, notify the supplier in writing. The notification should:
- Reference the specific lot number and the failure identified
- Include the COA lot number, your incoming inspection findings, and any retesting results
- State that the lot is quarantined pending resolution
- Request the supplier's response within a defined timeframe (typically 5-10 business days)
- Specify what resolution you're requesting: replacement lot, root cause investigation, corrective action plan, or all of the above
Tone: Supplier notification of a lot failure should be professional and factual, not accusatory. The goal at this stage is information and resolution, not blame. The documentation you're creating, however, should be precise and complete — it may matter if the supplier disputes the failure or if there is downstream legal exposure.
Step 4: Conduct a Root Cause Investigation
For lot failures involving total THC exceedances or significant contaminant findings, a root cause investigation should be initiated in parallel with supplier notification.
For THC exceedance:
- Was the exceedance at the ingredient level (the extract itself has too high a total THC) or at the finished product level (the ingredient is compliant but the formulation uses too much per serving)?
- Is this a one-lot issue or does the problem appear in the supplier's recent lot history?
- Could the exceedance reflect a stability/degradation issue (THCA decarboxylating during storage)?
For contaminant findings:
- Pesticides: Does the finding reflect the biomass sourcing, the extraction process, or a contamination event during processing or storage? Does the finding affect only this lot or does the supplier's broader testing history show a pattern?
- Heavy metals: Hemp is a bioaccumulator. A heavy metal finding often reflects soil conditions at the biomass source. Was this lot from a new sourcing region?
- Microbials: A microbial positive may reflect handling, storage, or packaging issues rather than the ingredient itself. Was the packaging intact? Were storage conditions controlled?
Step 5: Disposition the Lot
Based on the root cause investigation and supplier response, the quarantined lot must be dispositioned:
Return to supplier. If the lot fails on ingredient-level compliance (too high total THC, confirmed contaminant above limit, authentic documentation gap that cannot be resolved), the lot should be returned to the supplier for credit or replacement. Returns should be documented with a formal Return Material Authorization (RMA) process and a reference to the specific failure findings.
Retest and release (with qualification). If the initial failure was borderline and independent retesting by a DEA-registered, ISO 17025-accredited laboratory (different from the supplier's laboratory) confirms compliance, the lot may be releasable with documented qualification rationale. This is appropriate for borderline COA results that your retesting confirms are within specification.
Destruction. For lots containing synthetic cannabinoids, lots with significant THC exceedances, or lots where the documented failure creates unacceptable legal exposure, destruction may be the appropriate disposition. Destruction should be witnessed and documented.
Hold for reformulation review. If the ingredient is compliant but the total THC per container in your finished product calculation is above 0.4mg at your current serving size, the lot is not necessarily unusable — it may be usable at a reduced ingredient level in a reformulated product. This requires formulation review and potentially label revision.
Step 6: Corrective Action and Supplier Follow-Up
A lot failure from an established supplier should trigger a formal corrective action process:
Supplier CAPA request. Require the supplier to submit a Corrective and Preventive Action (CAPA) document that identifies the root cause of the failure and the steps being taken to prevent recurrence. Set a response deadline (typically 30 days for a preliminary CAPA, 90 days for a fully implemented corrective action).
Incoming inspection adjustment. Based on the root cause findings, adjust your incoming inspection protocol for this supplier. If a single lot failed, increased testing frequency for the next several lots may be appropriate. If the failure reflects a systemic issue, a supplier qualification review may be warranted.
Qualification review decision. For a supplier with a clean track record, a single lot failure that is resolved with documented CAPA is typically not a reason to disqualify the supplier. For a supplier with repeated failures, inadequate CAPA responses, or failures that reflect fundamental compliance gaps (not using DEA-registered lab, not performing HPLC), a qualification review that may result in disqualification is appropriate.
Step 7: Close the Deviation Record
The deviation record opened when the lot was quarantined should be closed formally when:
- The lot disposition is complete and documented
- The supplier CAPA has been received and reviewed
- Any incoming inspection adjustments are implemented
- The root cause investigation findings are documented
Closed deviation records should be retained in your quality records system for the applicable retention period. They are evidence of a functioning quality system and will be reviewed during customer audits and regulatory inspections.
Conclusion
A lot failure handled well — quarantined quickly, investigated thoroughly, resolved cleanly, and documented completely — demonstrates a quality system that works. A lot failure handled poorly exposes your organization to the downstream consequences of non-compliant ingredient in finished products, inadequate documentation, and the appearance of a quality system that only works on paper.
The protocol matters. Train your team on it before you need it.
Low Gravity Hemp maintains transparent communication with B2B customers on any lot quality finding. Our quality team is available to support customers through incoming inspection processes and lot qualification questions. Contact us to discuss our quality management practices.
