The cannabinoid content of legal cannabis in Washington State varies systematically across testing facilities and popular consumer products

In 2017, Washington State's cannabis testing laboratories were going through a mini-crisis, with questions of credibility being raised about certain laboratories' testing methodologies and practices. How much were differences in tested samples based on differences in methodologies? What more can be done by laboratories in the industry? This 2018 paper by Jikomes and Zoorob answer these questions and more, using "a large dataset from Washington State’s seed-to-sale traceability system." Their analyses of this dataset showed "systematic differences in the results obtained by different testing facilities in Washington," leading to "cannabinoid inflation" in certain labs. The authors conclude that despite the difficulties of having cannabis illegal at the federal level, efforts to standardize testing protocols etc. must continue to be made in order to protect consumers and increase confidence in the testing system.

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