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Health Canada cannabis heavy metals testing limits for lead, arsenic, cadmium, and mercury: oral-route ppm values derived from USP <232>, the inhalation-route caveat, root-cause failure patterns, and the QAP checklist for auditing the heavy metals section of every COA.

The total THC formula for cannabis is Total THC equals THCA times 0.877 plus THC. Worked examples, the 0.877 conversion factor math, common audit errors QAPs find on a cannabis COA, and how Health Canada applies it to labelling and excise.

ISO 17025 cannabis lab accreditation explained for Canadian QAPs: scope annex verification, Health Canada approved list cross-check, quarterly supplier re-verification SOP, and what to do if a lab loses accreditation mid-lot.

Health Canada microbial limits for cannabis flower, extracts, and edibles: TAC, TYMC, E. coli, Salmonella, and bile-tolerant gram-negative thresholds with QAP failure-response workflow.

How to read a cannabis COA section by section: header, Total THC formula, microbial limits, heavy metals, and lab accreditation. Free 10-point QAP checklist.