06-11-2026, 07:34 AM
We tell everyone to "check the COA" but nobody explains how to actually read one, so let's fix that. Takes two minutes once you know what you're looking at.
Step 1: Check who ran the test
The lab name should be at the top. Google it. A real third-party lab has a website, an address, and usually a license number. If the "lab" is the vendor themselves, that's not a COA, that's marketing.
Step 2: Match the batch
Every COA has a batch or lot number. It should match the batch printed on the product you're actually buying. A vendor showing you a COA from a different batch (or with no batch at all) is showing you a piece of paper, not proof.
Step 3: Check the date
Cannabinoids degrade over time. A COA from over a year ago tells you what the product WAS, not what it is. Fresher is better, especially for flower.
Step 4: Read the cannabinoid table
The two numbers that matter:
You'll also see "Total THC" which is calculated as: delta-9 + (THCa x 0.877). That 0.877 is there because THCa loses some weight when it converts. Total THC is the real-world potency number once you light it.
Step 5: Check the safety panels
A full panel COA also tests for pesticides, heavy metals, mold, and residual solvents, each with a PASS or FAIL. A lot of cheap vendors only pay for the potency test and skip safety panels entirely. For something you're putting in your lungs, full panel matters.
Step 6: Verify it's real
Most legit labs put a QR code or verification link on the COA that pulls up the original report on the lab's own website. Scan it. Photoshopped COAs are a real thing and this defeats them instantly.
If a vendor can't or won't provide a COA that passes these six checks, walk away. There are plenty who will.
Got a COA you're not sure about? Post it in this section and we'll take a look.
Step 1: Check who ran the test
The lab name should be at the top. Google it. A real third-party lab has a website, an address, and usually a license number. If the "lab" is the vendor themselves, that's not a COA, that's marketing.
Step 2: Match the batch
Every COA has a batch or lot number. It should match the batch printed on the product you're actually buying. A vendor showing you a COA from a different batch (or with no batch at all) is showing you a piece of paper, not proof.
Step 3: Check the date
Cannabinoids degrade over time. A COA from over a year ago tells you what the product WAS, not what it is. Fresher is better, especially for flower.
Step 4: Read the cannabinoid table
The two numbers that matter:
- THCa % - the potency you're paying for
- Delta-9 THC % - needs to be under 0.3% for the product to be sold as hemp
You'll also see "Total THC" which is calculated as: delta-9 + (THCa x 0.877). That 0.877 is there because THCa loses some weight when it converts. Total THC is the real-world potency number once you light it.
Step 5: Check the safety panels
A full panel COA also tests for pesticides, heavy metals, mold, and residual solvents, each with a PASS or FAIL. A lot of cheap vendors only pay for the potency test and skip safety panels entirely. For something you're putting in your lungs, full panel matters.
Step 6: Verify it's real
Most legit labs put a QR code or verification link on the COA that pulls up the original report on the lab's own website. Scan it. Photoshopped COAs are a real thing and this defeats them instantly.
If a vendor can't or won't provide a COA that passes these six checks, walk away. There are plenty who will.
Got a COA you're not sure about? Post it in this section and we'll take a look.