How do I read a COA?

Five checks cover most of it. One: the batch number on the report matches the batch on your product — no match, no evidence. Two: the lab is a real, ISO/IEC 17025-accredited third party, not the vendor’s in-house operation. Three: the math — total THC should equal THCA × 0.877 + Δ9, and it should roughly match the advertised number. Four: the test date is under a year old. Five: on a full panel, contaminants read ND (not detected). Our free 10-point checklist turns this into a two-minute routine.