PROVIDENCE, R.I. — Norman Birenbaum, Rhode Island’s top medical marijuana regulator, could be heading to Massachusetts to oversee the start of that state’s legal pot business.Birenbaum is one of three finalists being interviewed Tuesday for executive director of the Massachusetts Cannabis Control Commission, said Steve Hoffman, the commission’s chairman.The position will pay roughly $150,000; Birenbaum currently makes $82,000.The executive [...]