March 4, 2016

This guide was updated on Feb. 24, 2020.

In most legal states, cannabis products that you purchase from a licensed facility are required to undergo a series of tests by a state-accredited lab. These tests help ensure that products are safe to consume and accurately labeled. Lab tests primarily screen for potency and levels of THC and CBD, residual pesticides, unwanted contaminants, and the presence of mycotoxins like mold and mildew. But as with everything in the cannabis world, requirements can vary widely state to state.

The importance of required lab testing was borne out during the 2019 VAPI lung injury outbreak. Vitamin E oil, the culprit in the outbreak, wasn’t specifically tested for by most cannabis labs—at least not…

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