Overview
A Metrc transfer manifest often shows a single batch moving from one licensed entity to another. Yet the cannabinoid totals on the manifest can differ from the lab results attached to the same shipment. This discrepancy is not a system bug; it is a consequence of how data flow, testing, and inventory practices intersect in California’s regulated market.
1. Lab results are not static
a. Updated certificates
California labs may issue a Certificate of Analysis (COA) and later release a revised version. Revisions can occur when additional testing is performed, when a lab identifies an analytical error, or when a state‑mandated audit requires a re‑run. Metrc records the original COA at the time of the transfer, but the revised COA can be uploaded later. The manifest therefore reflects the earlier numbers, while the current COA shows a different cannabinoid profile.
b. Multiple test dates for the same lot
A single lot can be split for testing. One sub‑sample may be tested on Day 1, another on Day 3. If the two sub‑samples produce different THC or CBD percentages, the lab may report a range or an average. Metrc only allows one set of values per manifest, so the distributor must choose which result to enter. The choice can lead to a manifest that does not match the later, consolidated COA.
2. Rounding and unit conversions
Metrc stores cannabinoid amounts in milligrams per package and then aggregates to total milligrams for the manifest. Labs report percentages to two decimal places. When converting a percentage to milligrams, rounding can create a variance of a few milligrams per package. Multiply that variance across dozens or hundreds of packages and the total on the manifest can differ noticeably from the lab‑derived total.
3. Split shipments and partial transfers
Distributors sometimes split a larger inventory into multiple transfers. Each partial transfer receives its own manifest, but the original lab result applies to the entire lot. If the first transfer moves 60 % of the inventory, the distributor must calculate the proportional cannabinoid amount. Manual calculations or spreadsheet errors can result in a manifest that lists a slightly higher or lower total than the lab’s proportional figure.
4. Inventory adjustments after the manifest is created
a. Damaged or destroyed packages
If a package is found damaged after the manifest is generated but before the physical hand‑off, the distributor may adjust the inventory in Metrc to reflect the loss. The manifest’s cannabinoid total remains unchanged, creating a mismatch.
b. Re‑weighing for compliance
Weight discrepancies can trigger a re‑weigh. When the weight changes, the calculated milligram total for cannabinoids must be updated. Metrc does not automatically recalculate the cannabinoid total on an existing manifest; the user must edit the manifest manually. Failure to do so leaves two different totals on record.
5. Use of different testing methods
Some labs use HPLC, others use GC‑MS. While both methods are accepted, they can produce slightly different potency numbers, especially for minor cannabinoids. If a distributor receives a COA from one lab for the inbound shipment and a different lab’s COA for the outbound product (e.g., after a processing step), the manifest may reflect the inbound numbers while the outbound COA shows the new values.
6. “Inaccurate Labeling (Cannabinoid inflation)” and the “Misbranded” risk
When a manifest’s cannabinoid total does not align with the COA attached to the shipment, regulators may view the product as Inaccurate Labeling (Cannabinoid inflation). If the discrepancy leads to a label that misrepresents the product’s potency, the product can be deemed Misbranded under California law. Both findings can trigger enforcement actions, including recall orders listed on the state recall portal (recalls.cannabis.ca.gov).
7. Preventive steps for distributors
a. Lock the COA at receipt
Upload the COA to Metrc as soon as the inbound shipment is received and lock the file. If a revised COA is issued, attach it as an amendment rather than replacing the original. This creates a clear audit trail.
b. Use a single source of truth for calculations
Adopt a spreadsheet or ERP module that pulls the lab percentages directly and applies the same rounding rules that Metrc uses. Products such as Acumatica can be configured to perform the conversion automatically, reducing manual entry errors.
c. Reconcile before finalizing the manifest
Run a reconciliation report that compares the manifest’s total milligrams to the calculated total from the COA. Any variance greater than a pre‑defined tolerance (e.g., 0.5 %) should trigger a review before the manifest is submitted.
d. Document any post‑manifest adjustments
If inventory is adjusted after the manifest is created, record the reason in the Metrc notes field and attach a supplemental document explaining the change. This documentation can be crucial during a DCC audit.
8. When a mismatch leads to a recall
If a discrepancy is discovered after the product has left the distributor’s control, the distributor may be required to issue a recall. The state’s recall database tracks these events; patterns can be seen on Phenominal’s recall trend analysis page (Recall Trend). Reviewing that data helps identify whether cannabinoid mismatches are a common driver of recalls in the region.
9. Common failure modes
Phenominal’s failure‑mode library outlines several scenarios that result in divergent cannabinoid values on a manifest. The most frequent include:
- Late lab updates – COA revised after manifest submission.
- Manual calculation errors – Spreadsheet formulas not aligned with Metrc rounding.
- Partial transfers – Proportional calculations not applied consistently.
A deeper dive into these scenarios is available on the firm’s failure‑modes guide (Failure Modes).
10. Bottom line
A Metrc transfer manifest can show two different cannabinoid values because of lab revisions, rounding, split shipments, inventory adjustments, and differing testing methods. Each source of variance is traceable and can be mitigated with disciplined data practices. Maintaining a clear audit trail, using automated calculation tools, and reconciling before finalizing manifests protect distributors from “Inaccurate Labeling (Cannabinoid inflation)” findings and the costly recalls that can follow.
This memo is for informational purposes only and does not constitute legal advice.