Growing & testing
Cannabis testing in Washington
A lab report describes a tested sample from a batch.
Last reviewed: 2026-09-14
The basics
Washington’s testing rule sets requirements by product type. Read the applicable table instead of assuming that every product is tested in exactly the same way. Match the certificate of analysis to the product and batch.
What the evidence means
Passing required tests is not a promise of zero risk. A report has a defined scope: the analytes tested, methods, limits and sample information. Claims about medical compliance require their own applicable standards.
A useful question
Can I see this batch’s report, including its date, tests and results?
Sources and further reading
Use the sources to check the scope of each claim. A chemical measurement, a laboratory experiment and a study in people answer different questions.