Michigan Cannabis Testing Requirements
Michigan’s CRA technical guidance combines MMFLA/MRTMA laboratory requirements and preserves Michigan’s own categories: marihuana product, harvest batch, inhaled flower, inhaled concentrate, vape concentrate, inhalable compound concentrate, infused product, and infused beverage.
Required and Conditional Panels
| Panel | Michigan-specific treatment |
|---|---|
| Potency | Minimum 0.5 g representative sample; required cannabinoids include THC, THCA, CBD, and CBDA; LOQ ≤ 1.0 mg/g |
| Foreign matter | Includes powdery mildew, organic, and inorganic material; inorganic matter causes automatic failure |
| Microbial screening | Total yeast/mold, total coliform, STEC, pathogenic Salmonella, and specified Aspergillus species |
| Chemical residues | CRA-published banned chemical residue list with action limits and LOQs; minimum 0.5 g sample |
| Heavy metals | Lead, inorganic arsenic, mercury, cadmium, chromium, nickel, and copper where applicable; minimum 0.5 g sample |
| Residual solvents | Minimum 0.25 g; product-category-specific inhaled/non-inhaled limits |
| Water activity | 0.65 aw for marijuana sample, 0.85 aw for edible infused product; exceptions for non-edibles and approved beverages |
| Mycotoxins | CRA-requested screen; accepted limits in the guidance are below 20 ppb for named aflatoxins and ochratoxin A |
| Target analytes | Vitamin E acetate and MCTs for vape cartridges; MCT testing mandatory beginning 2024-10-01 |
| Homogeneity | Ten randomly sampled doses/servings; weight and delta-9 THC variability no more than +/-15% |
| Beverage pH | Required for infused beverages; CRA guidance references AOAC 945.10 |
Numeric Action Limits
The normalized source file preserves analyte, matrix class, unit, limit, and source section in TDTS-0024. Examples include:
| Analyte | Matrix | Limit |
|---|---|---|
| Lead | inhaled flower / inhaled concentrate / other products | 1.00 / 0.500 / 0.500 ppm |
| Inorganic arsenic | inhaled flower / inhaled concentrate / other products | 0.400 / 0.200 / 1.500 ppm |
| Mercury | inhaled flower / inhaled concentrate / other products | 0.200 / 0.100 / 3.000 ppm |
| Cadmium | inhaled flower / inhaled concentrate / other products | 0.400 / 0.200 / 0.500 ppm |
| Total yeast & mold | adult-use flower / infused product | 100,000 / 10,000 CFU/g |
| Total coliform | flower / infused product | 1,000 / 100 CFU/g |
| Vitamin E acetate | inhalation product LOQ | 100 ppm |
| MCT C6 and C8 | inhalation product LOQ | 100 ppm each |
Sampling, Reporting, Retesting, and Remediation
The laboratory collects the sample from another marihuana business. Chain of
custody must include the complete Metrc identification number, product name and
type, number of containers, and source-package and test-sample weights. CRA says
results are reported as pass/fail in Metrc and on the COA; values below the
method LOQ retain the numerical LOQ and the <LOQ notation.
The rules and guidance allow the CRA to publish minimum portions, LOQs, and action limits, and they distinguish safety testing from additional terpene reporting. Retesting, remediation, and failed-test disposition are governed by the current rule set and product category; this archive does not infer a pass from a later retest without a linked source record.
Source
- CRA technical guidance, version 5.2, revised 2024-09-23
- CRA laws, rules, and other resources
- Michigan administrative-rule text for sampling/testing
Retrieval date: 2026-08-09. The guidance is operational technical direction, not legal advice; the rule and statute control if they differ.
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