“The priority, from a regulatory perspective, is the safety and well-being of the most vulnerable,” Wells told the commission at its meeting in Springfield. She said one complication is MGM's open floor plan, with multiple entrances to the gambling area. Karen Wells leads the Investigations and Enforcement Bureau at the Massachusetts Gaming Commission. Massachusetts regulators have fined MGM Springfield $100,000 for falling short in its efforts to keep people under 21 from gambling or drinking alcohol.