A father and son face drug charges in Marshall County following a traffic stop late Tuesday night on U.S. 31 near U.S. 6. The driver, Marshall Smith Sr., 52, of Mishawaka was believed to be under the influence of a controlled substance, according to a news release from the Marshall County Sheriff’s Department. The passenger, Marshall Smith Jr., 28, was reportedly found to be in possession of synthetic marijuana. Officers detained both men and searched the vehicle. That’s when they reportedly found more than three grams of what appeared to be methamphetamine packaged for resale. Both men were arrested. Marshall Smith, Sr. faces charges of operating a vehicle while intoxicated endangering a person, operating a vehicle while intoxicated controlled substance, dealing and possession of more than three grams of methamphetamine. Marshall Smith, Jr. was charged with possession of marijuana with a prior charge, dealing and possession of more than three grams of methamphetamine. Bond was set at $20,000 cash. Formal charges are pending with the Marshall County Prosecutors Office.