Who's Responsible for a Cannabis COA in Michigan?

Michigan-specific and educational only, not legal advice. Rules change; operators should confirm current requirements with the CRA or counsel.

Michigan built one of the largest adult-use markets in the country, and its testing chain has a twist you won't see in California: the lab comes to you. Instead of a licensee handing over a sample, the lab sends someone to the grow to pull it.

There is no distributor here either. The grower or processor arranges testing directly with a licensed lab. Here is one batch's path from the grow room to the shelf.

The short version:

The COA comes from an independent, CRA-licensed, ISO/IEC 17025 lab.

There is no distributor tier. The grower or processor arranges the test directly.

The lab travels to the site and pulls the sample itself; a business employee may watch but not touch it.

The retailer confirms in Metrc that the product passed and is labeled before it can be sold.

Here is how it actually works, following one batch from the field to the shelf.

▶ Try the interactive version (https://weed-central.com/learn/coa/usa-michigan?utm_source=newsletter.weed-central.com&utm_medium=newsletter&utm_campaign=who-s-responsible-for-a-cannabis-coa-in-michigan): follow one batch from farm to shelf and watch the label build up, color-coded by who adds each piece.

A quick note on the rulebook

Michigan cannabis is regulated by the Cannabis Regulatory Agency (CRA) under the administrative rules at R 420.301 and following. Every plant and package is RFID-tagged in Metrc.

Meet the players

The grower creates a harvest batch (capped at 50 pounds), each plant tagged in Metrc. Adult-use grower licenses carry an AU-G prefix.

The processor turns flower into the finished product and arranges its own testing.

The lab travels to the site, pulls the sample, runs the panel, and issues the COA. Safety-compliance labs carry an AU-SC prefix.

The retailer (provisioning center) confirms the product passed in Metrc and sells to 21+. Retail licenses carry an AU-R prefix.

The state (CRA) watches the chain through Metrc and runs its own random audit sampling.

The COA workflow, step by step

Grower / harvest batch (Grower). The grower creates a harvest batch (≤ 50 lb), each plant RFID-tagged in Metrc. This becomes the label’s Metrc package tag, harvest date, and net weight. Michigan has no distributor.

Quarantine, request testing (Grower). The batch is held apart while the grower (flower) or processor (final form) arranges testing directly with a CRA-licensed lab.

Lab samples on-site (Lab). Michigan is unusual: the lab travels to the site and pulls the sample itself (a business employee observes but may not touch it), with a signed chain-of-custody.

Safety-compliance analysis (Lab). The independent, ISO/IEC 17025 lab runs potency, foreign matter, microbials, chemical residue, metals, solvents, and vape checks.

Pass/fail into Metrc + COA (Lab). The lab enters pass/fail into Metrc and issues the COA. This unlocks THC & CBD and the tested-by lab + date.

Pass / fail (Regulatory). A failed batch is destroyed or remediated, then must pass two consecutive re-tests. The CRA also runs its own random audit sampling.

Package + label (Grower). The grower/processor adds Michigan’s green inverted triangle “MARIJUANA PRODUCT” symbol, the potency + a “value may vary by 10%” note, and the warnings.

Retail sale (Retailer). The retailer confirms in Metrc that the product passed, isn’t on hold, and is labeled, then sells to 21+ and hands over a required info pamphlet.

What a licensed lab tests for

A Michigan lab runs a safety-compliance panel:

Cannabinoid potency (THC and CBD)

Foreign matter

Microbials

Chemical residue (pesticides) and heavy metals

Residual solvents and vape-specific checks

A failed batch is destroyed or remediated, and then must pass two consecutive re-tests before it can move. The CRA also pulls its own random audit samples.

What ends up on the package, and who puts it there

A Michigan label carries the product identity, the net weight, the potency, the Metrc package tag, the harvest date, the grower or processor, and the required warnings, in child-resistant packaging.

Michigan's symbol is a green inverted triangle with a "MARIJUANA PRODUCT" banner, with no exclamation point and no "THC." It also requires the potency to carry a note that the value may vary by up to 10 percent.

The warning, word for word

Michigan requires several warnings, including a boxed statement on use during pregnancy:

It is illegal to drive a motor vehicle while under the influence of marihuana.

National Poison Control Center 1-800-222-1222.

For use by individuals 21 years of age or older or registered qualifying patients only. Keep out of reach of children.

WARNING: USE BY PREGNANT OR BREASTFEEDING WOMEN, OR BY WOMEN PLANNING TO BECOME PREGNANT, MAY RESULT IN FETAL INJURY, PRETERM BIRTH, LOW BIRTH WEIGHT, OR DEVELOPMENTAL PROBLEMS FOR THE CHILD.

The QR question

Michigan does not require a QR code linking to the COA on the package. The Metrc package tag ties the product back to its record. Some brands add a COA QR voluntarily, but it is not mandated.

Common myths

"The grower samples its own batch." No; the lab comes to the site and pulls the sample itself.

"There's a distributor." No; the grower or processor arranges testing directly.

"The potency is exact." Michigan labels carry a note that the value may vary by up to 10 percent.

"The store tested it." No; it confirms in Metrc that the batch passed and is labeled.

How to read a COA as a customer

Three quick checks:

Does it pass? Look for an overall pass, and scan for any fail on the contaminant sections.

Does it match the package? The COA's Total THC and CBD should line up with the label, and the batch numbers should match.

Is it current and real? The issuing lab should be an independent, accredited facility, and the tracking tag confirms it is a real, logged package.

The one-line takeaway

Michigan has no distributor, the grower and processor arrange testing directly, and the lab comes to the site to pull the sample itself. Michigan’s symbol is a green inverted triangle with a “MARIJUANA PRODUCT” banner (no “!”, no “THC”), potency carries a required “±10%” note, and compliance runs on Metrc plus CRA audits.

Michigan-specific and educational only, not legal advice. Sources: Michigan Cannabis Regulatory Agency (CRA), R 420.301 et seq.; Michigan Metrc track-and-trace.