Lab shopping is one of the cannabis industry’s worst-kept secrets. The practice involves submitting product samples to multiple testing laboratories until one returns a passing result, then using that COA to clear the product for retail sale. While not always explicitly illegal, lab shopping undermines the integrity of compliance testing and is increasingly drawing regulatory scrutiny heading into 2026.
How Lab Shopping Works
A cultivator harvests a batch that fails initial testing for mold, yeast, or potency. Rather than destroying the batch or pursuing remediation, the operator submits the same product to a second lab — and if necessary, a third — hoping for a different result. In states without robust lab audit systems, this can succeed, placing non-compliant product into the retail supply chain with a passing COA.
Why Labs Sometimes Produce Different Results
Cannabis testing is not perfectly standardized across labs. Different labs use different sampling methods, different analytical instruments, and different internal quality controls. Legitimate variation in test results exists. But the range of variation from legitimate analytical differences is far narrower than what lab shopping exploits. When a batch fails by a wide margin at Lab A but passes comfortably at Lab B, that is a red flag for regulatory systems designed to detect it.
The 2026 Regulatory Response
States are responding to the lab shopping problem with several tools. Mandatory lab accreditation under ISO 17025 standards is being required in more markets, creating a baseline for analytical competency. Inter-laboratory proficiency testing programs require labs to correctly analyze identical blind samples, identifying outliers. Some states have implemented tracking requirements that capture every lab submission for a given batch, making it impossible to hide sequential submissions.
What Honest Cultivators Should Do
For cultivators who are not engaging in lab shopping, the crackdown is good news. A market where every operator is held to the same standard is a more level playing field. But it also raises the stakes for first-pass compliance. Cultivators who invest in pre-testing decontamination and quality assurance protocols will consistently outperform those who rely on luck at the lab.
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