Short answer
No federal agency regulates cannabis lab testing. Each state with a legal market writes its own rules. Those rules set three things: what must be tested, who may take the sample, and what credentials the lab must hold. Most states with adult-use sales mandate testing. Medical-only states mandate less, and a few mandate none.
what does cannabis lab tested mean
Typical test panel
Panels differ by state. Most include:
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- Potency: THC, CBD, and THC-A after decarboxylation
- Pesticides: 60 to 100 or more analytes, set by state
- Microbials: total yeast and mold, E. coli, Salmonella
- Heavy metals: lead, cadmium, arsenic, mercury
- Residual solvents: butane, propane, ethanol, hexane
- Mycotoxins: aflatoxin and ochratoxin
- Moisture content and water activity
- Foreign matter
Terpenes appear on the panel only when a label makes a terpene claim.
Panel size by state
California requires the full panel for all cannabis goods. Colorado, Oregon, Nevada, Washington, Massachusetts, Illinois, Michigan, and New York require most of that list. Florida tests medical products only. Some states test flower and exempt topicals and edibles.
Sampling rules
Sampling is where states diverge. Colorado requires the licensed lab to collect the sample at the production site. Washington requires the lab or a certified sampler. California allows sampling by the distributor or the lab, using batch-size tables. States that let producers submit their own samples accept more risk of cherry-picked product. States that require lab sampling add a trip charge: 1 to 3 hours of technician time per batch.
Lab accreditation
Most regulated states require ISO/IEC 17025 accreditation. Examples: Colorado, Washington, Oregon, Massachusetts, Michigan, Illinois, and Nevada. Accreditation bodies include A2LA and PJLA. Labs also run proficiency tests, twice a year in many states, against standards from AOAC or ASTM. California licenses labs and requires accreditation from an approved body.
Turnaround and cost
Turnaround runs 3 to 10 business days. A full-panel test costs about $500 to $1,500 per batch. Price depends on state, product type, and panel size. Potency-only tests cost under $100 in states that permit them.
Failures and retesting
Failure rates differ by state and product. Some states publish batch-level data; others do not. Failed batches can be remediated in some states, for example by filtering concentrates or sending flower to extraction. Colorado and California allow limited retests. A second failure means destruction in most states.
Where convenience enters
Convenience does not change the panel. It changes three things: the sample trip, the turnaround, and the number of licensed labs. States with few labs see longer waits and higher prices. When a state adds a contaminant to the list, labs need new instruments and method validation. That takes months.
What is not standardized
Action limits for pesticides, moisture thresholds, potency label tolerance, and rules for hemp-derived products differ by state. No national rule exists. A product that passes in one state can fail in the next.