James B Cox, III, was arrested on Thursday after he left his vehicle unattended in a gas station parking lot, and an officer stopped to investigate. He was found to have ‘Grey Death’ in his possession – which is a newer street drug combination of heroin, meth, cocaine, and often carfentanil and other narcotics. Just before 4 AM Thursday morning, James Cox pulled into the Speedway at 2600 Gallatin Pk and left his red Pontiac G6 running and unattended. After a stop was conducted, MNPD reports a smell of marijuana was…