Laboratory Testing, Quality Assurance, and Product Safety
Testing categories
Candidates must know the standard test panels: cannabinoid potency, terpene profile, residual solvents, pesticides, heavy metals, microbial contamination (including Aspergillus), mycotoxins, and water activity/moisture. Understand sampling: representative sampling, composite versus individual samples, and why sample size and homogeneity matter. Know the concept of limit of detection (LOD) and limit of quantification (LOQ) and how they affect pass/fail reporting.
QA systems
Understand the role of an independent, licensed laboratory, chain-of-custody documentation, and the prohibition on labs also holding production licenses in many jurisdictions. Grasp the difference between quality control (testing) and quality assurance (the system that prevents defects). Know how failed results are handled: quarantine, retest rules, and destruction or remediation requirements. Understand stability and shelf-life considerations, especially for edibles and beverages.
Traps in questions
- Assuming a single passing test covers an entire harvest without representative sampling.
- Confusing LOD with LOQ.
- Believing a failed result can be retested until it passes; retest rules are strictly limited.
- Overlooking water activity as a microbial risk indicator.
- Forgetting chain-of-custody breaks invalidate results.
Rule of thumb
Use the "representative sample plus documented chain" rule: a result is only as valid as the sample and its custody trail. Worked example: a cultivator submits one top cola from a 50-plant harvest and passes; a regulator finds the sample was not random or representative, so the result is invalid and the batch must be resampled per the approved plan before release.