Oklahoma Cannabis Testing Overview
COA Requirement:
Required.
All medical marijuana and marijuana products must pass laboratory testing by a licensed facility before being transferred or sold. A Certificate of Analysis (COA) must be issued and retained for at least 2 years. Results must clearly indicate "Pass" or "Fail" in no smaller than 12-point Times New Roman font.
Cannabinoid Testing:
Testing includes (at a minimum):
- Δ⁹-THC
- THCA
- CBD
- CBDA
- THC (Total THC must be calculated: THCA × 0.877 + Δ⁹-THC)
- Additional cannabinoids may be tested but are not mandated.
Terpene Testing:
Not required.
Terpenes may be tested voluntarily but are not mandatory for compliance testing.
Contaminants Tested For:
All major categories required.
a. Pesticides: Products must pass the most stringent EPA limits. Detection of any unapproved pesticide results in an automatic fail.
b. Microbiological Contaminants: E. coli, Salmonella spp.: Must be absent
- Total aerobic bacteria, yeast & mold: limits vary by product type
- Failed batches can only be processed into solvent-based concentrates (remediation)
c. Mycotoxins:
- Aflatoxins B1, B2, G1, G2 (total): <20 µg/kg
- Ochratoxin A: <20 µg/kg
d. Heavy Metals: (must test for and pass limits for):
- Arsenic
- Cadmium
- Lead
- Mercury
- Specific threshold values must align with USP <233> and state rule tables
e. Filth and Foreign Materials: COAs must identify any foreign material observed, such as:
- Hair
- Insects
- Mold
- Dust
- Packaging fragments
Contaminants Not Required (But of Concern):
- Listeria monocytogenes, Shigella spp., and Clostridium botulinum are not mentioned
- Terpene testing is not required
- Chromium and Nickel are not included among heavy metals
Risk Level:
Moderate Concern: Oklahoma requires all essential contaminant screening, but omits terpene testing and does not require specific action limits for some uncommon but hazardous metals or pathogens.
Moisture and Water Activity:
Flower must have:
- Moisture content ≤15%
- Water activity (aw) ≤0.65
Batches that fail must be cured further or remediated into concentrate
State Cannabis Regulatory Agency:
Oklahoma Medical Marijuana Authority (OMMA): a division of the Oklahoma State Department of Health
Website: https://oklahoma.gov/omma
Email: OMMACompliance@ok.gov
Phone: (405) 522-6662
Address: 123 Robert S. Kerr Ave., Oklahoma City, OK 73102
References:
Oklahoma State Department of Health. (2021). Title 310. Oklahoma State Department of Health, Chapter 681. Medical Marijuana Regulations.
Oklahoma State Department of Health. (2024). OAC 310:681 – Medical Marijuana Laboratory Regulations.