A Certificate of Analysis, or COA, is the independent lab report that sits behind every legal cannabis product in New York. It is the receipt that says a batch was tested by a state-permitted laboratory and what that testing found. Think of it as the nutrition label and the safety inspection rolled into one document.
Two pieces matter most. First, the potency panel tells you how much THC, CBD, and other cannabinoids the product actually contains. Second, the contaminant panels confirm the batch was screened for things you do not want to inhale or eat, like heavy metals, pesticides, residual solvents, and mold. On every legal New York package you will find a QR code or link that opens that batch's COA. Scan it before you buy if you want to know exactly what you are getting.
What is a Certificate of Analysis (COA) for cannabis?
A COA is a lab report from a state-permitted testing laboratory that summarizes a specific batch's results. It lists cannabinoid potency, terpenes, and screens for contaminants like pesticides, heavy metals, residual solvents, mold, and mycotoxins. In New York, a valid COA is required before a product can be sold.
Why New York requires a COA
Under the state's adult-use program, every batch of cannabis must be tested by an OCM-permitted laboratory before it reaches a shelf. The lab issues the COA, the results are reported to the Office of Cannabis Management, and the product label must carry a scannable QR code or link to that document. This is one of the clearest differences between the legal market and the gray-market shops that sell untested products. A licensed dispensary like The Highline can show you the paper trail for anything in the case.
The potency panel
The potency section lists cannabinoids by percentage for flower or by milligrams for edibles and tinctures. You will usually see THC, THCA, CBD, CBDA, and sometimes minor cannabinoids like CBG or CBN. Total THC is the number most people scan for, since it accounts for the THCA that converts to THC when you heat the flower.
New York also sets a accuracy window. For adult-use products, the tested THC must fall within roughly 85 to 115 percent of the value printed on the label. So a package marked 20 percent THC should test somewhere in that band. If you want to understand how that total is calculated, our total-THC explainer breaks down the math.
The safety panels
This is the part that matters most for what you are putting in your body. A New York COA screens each batch across several categories, and the goal is simple: every line should read PASS or sit under the legal limit.
- Microbials and mold, including yeast, certain bacteria, and Aspergillus
- Mycotoxins, the toxic compounds some molds produce
- Heavy metals such as lead, arsenic, cadmium, and mercury
- Pesticides, herbicides, and fungicides
- Residual solvents, which matter most for extracts and concentrates
- Moisture content and water activity, which affect freshness and mold risk
How do I read a cannabis COA quickly?
Check three things. Confirm the batch or lot number matches your package. Look at the potency panel for total THC or milligrams per serving. Then scan the contaminant sections and make sure every category reads PASS or falls under the limit. If a whole panel is missing, the product may not have been fully tested.
A COA is the difference between a tested batch and a guess. Scan it, and you stop guessing.
How to find and use a COA at The Highline
On a physical package, point your phone camera at the QR code and it opens the report. On our menu at /order, many product pages link the lab results directly. Match the batch or lot number on the COA to the one on your package, since a COA is specific to one batch, not the whole product line. If you cannot find it, ask a budtender. We can pull it up for you.
Reading a COA gets faster with practice, and after a few visits it becomes second nature. Browse the menu at /order, scan a few reports, and ask a Highline budtender to walk you through one in person. We carry roughly 40 craft cultivars from independent upstate growers, and every one of them comes with its paperwork.