A Sullivan County Grand Jury Has Decided Not To Indict A Sheriff’s Captain Accused Of Domestic Violence Against His Wife. Kingsport Police Responded To The Home Of Mark Ducker Last Month At The Request Of The Sheriff’s Office. According To A Police Report, No One Was Charged After A Primary Aggressor Could Not Be Determined And There Were No Physical Injuries. The Case Was Then Taken To A Grand Jury Which Failed To Issue A True Bill. Sheriff Wayne Anderson Said There Was No Findings In An Internal Investigation And Ducker Has Since Returned To Work.