What Third-Party Lab Testing Actually Checks For (Beyond Potency)

Most people glance at a Certificate of Analysis for one number: the THCA or total THC percentage. That's understandable, but it's also only a fraction of what a full-panel COA actually tests for. A real lab report is closer to a food safety document than a potency chart, and understanding what else it covers is useful for knowing what you're actually buying.

The compliance number: cannabinoid potency

The potency panel is where THCA, Delta-9 THC, CBD, and other cannabinoids get measured, usually reported as a percentage by dry weight. This is also the number that determines federal compliance — hemp is legally defined by the 2018 Farm Bill as cannabis containing no more than 0.3% Delta-9 THC on a dry-weight basis. It's an important number, but on a full-panel COA it's typically just the first section, not the whole report.

Pesticides: screening for what shouldn't be there

A thorough pesticide panel tests for dozens of compounds — often 30 to 60 or more — checking that each comes back at "not detected" or below an established action limit. Because cannabis and hemp plants can absorb and concentrate whatever was used during cultivation, this panel matters more here than it might for many other agricultural products, and it's one of the clearest indicators of how a crop was actually grown.

Heavy metals: a soil and environment check

Heavy metal testing screens for arsenic, cadmium, lead, and mercury — contaminants that don't come from anything added during growing, but from what the plant absorbed out of its soil, water, or surrounding environment. Cannabis is a known bioaccumulator, meaning it can concentrate heavy metals present in its growing medium more readily than many other crops, which is exactly why this panel is treated as a standard part of a full COA rather than an optional add-on.

Microbials: the contamination risk that's invisible to the eye

Microbial testing checks for harmful bacteria and fungi — things like E. coli, Salmonella, and various species of mold and yeast, including Aspergillus, a mold capable of producing dangerous mycotoxins. None of this is visible or detectable by smell in the early stages, which is exactly why it has to be tested in a lab rather than assessed by eye. This panel is closely tied to how flower was dried, cured, and stored — rushed or improperly humidity-controlled batches are far more likely to fail it.

Mycotoxins and residual solvents: the less obvious risks

Mycotoxins are byproducts of mold contamination and are tested separately from the microbial panel itself, typically measured in parts per billion against an action threshold. Residual solvent testing applies mainly to extracted products rather than raw flower, checking for leftover trace chemicals from any processing step — but it's worth knowing this panel exists, since it's part of why extracted products (like distillate-based vapes) carry a different testing burden than whole flower does.

Why the full panel matters more than the headline number

A high THCA percentage on its own doesn't tell you anything about whether a batch is clean. A product can test potent and still fail on pesticides, heavy metals, or microbials — which is exactly why a real COA is a multi-page document, not a single number on a label. When comparing sellers, checking whether a lab report only shows potency or whether it shows a full contaminant panel is one of the fastest ways to tell a serious operation from one cutting corners.

Every batch of Miiintz flower ships with a third-party COA covering potency, pesticides, and heavy metals, so the number on the front of the listing is never the whole story — the rest of the report is available too.