Researchers tested 75 marijuana-infused edibles from Washington and California and found wide discrepancies between the potency advertised on the labels and what the products actually contained.

The findings, published in JAMA, echo an Oregonian/OregonLive report earlier this year that found labels inflated the product’s actual potency. We commissioned an experienced analytical chemist to conduct a detailed potency analysis of 15 marijuana-infused edible products sold in Portland dispensaries and found only one contained accurate potency information on its label.

Johns Hopkins University School of Medicine funded the latest study. The cost of the testing was paid for by the Werc Shop, a marijuana testing lab with locations in California and Washington.

The New York Times reports that the analysis included 75 products purchased in Seattle, San Francisco and Los Angeles. Just 17 percent were accurately labeled. 

Some discrepancies were notably large: In one case, a product had just three milligrams of THC even though its label claimed 108, said Ryan Vandrey, the study’s lead author and an associate professor of psychiatry and behavioral sciences at the Johns Hopkins University School of Medicine.

— The Oregonian

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