DARLINGTON COUNTY, S. C. (WPDE) — The Darlington County Sheriff's Office has charged a man they say threatened to use a weapon of mass destruction against the Darlington Raceway. Michael Donavan Avin, 46, of Darlington, left a threatening telephone message at the Darlington Raceway on April 27, investigators say. Warrants allege Avin had written a letter to another location within the county stating he had access to 125 tons of bomb-making materials. Avin was booked into the W.