As if the epidemic of opioid addiction and overdoses isn’t bad enough, a new study finds that – in a very small number of cases – opioid use has been linked to profound memory loss. It’s kind of a medical mystery story that started in November of 2015. That’s when Dr. Jed Barash, a neurologist at Lahey Hospital and Medical Center in Burlington, MA, brought four patients to the attention of officials at the Department of Public Health. All four had showed up at the hospital with amnesia and, in