A group of Maryland doctors plans to open a medical marijuana testing facility in Columbia to ensure product quality as the state prepares to launch its burgeoning therapeutic cannabis industry.

Testing is required by state law for cannabis growers, which presented an opportunity for the group of four doctors, led by Dr. Andrew Rosenstein, chief of the division of gastroenterology at University of Maryland St. Joseph Medical Center.

Rosenstein said the doctors were worried about potential threats to some of their sickest patients from contaminants in cannabis that could complicate conditions rather than alleviate pain and other symptoms.

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Meredith Cohn ~ BaltimoreSun.com ~ca