The California Department of Cannabis Control revoked a commercial testing laboratory’s permit a month ago after tests at state-run labs discovered a harmful pesticide in marijuana the private lab had cleared for sale.
Many industry operators and a national association of state regulators consider oversight at so-called “reference laboratories” to be a best practice that should be standard in all state-regulated marijuana markets.
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Absent reference laboratories, some states contract private, third-party labs to verify licensed cannabis labs’ compliance with safety standards as well as the reliability of THC-potency results.
But more than half of the country’s biggest marijuana markets do not have a reference lab, according to analysis by MJBizDaily, a glaring gap that critics say raises major questions about product labeling and
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