CHARLESTON -- While opioid distributors have argued there is no proof of connection between prescription painkiller use and illicit drug use, an expert in the neurobiology of addiction said, during the second day of a landmark federal trial against those distributors, that people who take prescription painkillers and illicit opioids see the same changes in their brain chemistry. Dr. Corey Waller, an Michigan doctor with expertise in pain and substance use disorder, testified May 4 at the federal courthouse in Charleston. Lawyers for the City of Huntington and Cabell County, which sued the “...