Grayson County Sheriff’s captain completes FBI National Academy training. Captain Jeremy Cox from the Grayson County Sheriff’s Office has returned from a 10-week training program at the FBI National Academy in Quantico, Virginia. Cox graduated from the 296th session of the FBI National Academy, describing the experience as a once-in-a-lifetime opportunity for law enforcement professionals. “It’s one of those moments in an individual’s career, especially at the executive level in law enforcement,