Rare drugs designed to mimic the opioid fentanyl are showing up more often in urine samples from Penobscot County than any other county in the nation, according to a recent study. The findings are concerning to the authors, they said, since they come at a time when the fentanyl analogs are frequently being added to methamphetamine, creating a deadly combination. In the study, published in the Drug and Alcohol Dependence journal, the authors analyzed 300,000 urine drug tests from July 15, 2019, through March 12, 2020.