How to Choose a Cannabis Testing Lab
Start with your state's approved lab list
Every legal state publishes a list of approved testing laboratories. Your lab must hold a current state license for your specific market. Using a non-approved lab means your test results won't be accepted by regulators, and your product can't legally reach shelves.
Check your state cannabis authority's website for the current list. Labs gain and lose approval status regularly, so verify before every new engagement.
Verify ISO 17025 accreditation
ISO 17025 is the international standard for testing laboratory competence. While some states don't require it yet, accredited labs produce more reliable results. Ask for their certificate and verify it with the accrediting body. This matters because inconsistent test results can lead to failed batches, regulatory scrutiny, and lost revenue.
Compare turnaround times
Standard turnaround ranges from 3-7 business days for a full compliance panel. Rush services (1-2 days) typically cost 50-100% more. If you're running a high-volume operation, negotiate guaranteed turnaround times in your service agreement. Delays at the testing stage ripple through your entire supply chain.
Understand pricing structures
Labs price by the test or by the panel. A full compliance panel (potency, pesticides, heavy metals, microbials, residual solvents, terpenes) runs $150-400 per sample. Potency-only tests start at $50-75. Volume discounts kick in at 10+ samples per month. Get quotes from at least three labs before committing.
Ask about retest policies
Products fail tests. When they do, you need to know: Does the lab offer retesting at reduced cost? What's the process for challenging a result? How quickly can you resubmit? Labs with transparent retest policies save you money and time when failures happen.
Evaluate their reporting
You need Certificates of Analysis (COAs) that meet your state's requirements and are easy for your team to read. Ask for sample COAs before committing. Good labs also offer digital reporting that integrates with seed-to-sale tracking systems.
Frequently Asked Questions
How often should I switch cannabis testing labs?
Most operators stick with one primary lab for consistency but maintain a relationship with a backup. Consider switching if turnaround times increase, pricing becomes uncompetitive, or you have concerns about result accuracy. Annual reviews of your lab relationship are good practice.
Can I use a testing lab in a different state?
No. Cannabis testing labs must be licensed in the state where the product was produced. Interstate commerce of cannabis is federally illegal, which means your samples can't cross state lines to reach an out-of-state lab.
What's the difference between compliance testing and R&D testing?
Compliance testing is mandatory and follows state-specific protocols to determine if your product meets legal requirements for sale. R&D testing is optional and helps you optimize your production process, test new strains, or troubleshoot quality issues. R&D tests are typically cheaper since they don't require the full regulatory panel.