KINGSPORT — Sullivan County’s school system no longer faces a multi-million-dollar black mold lawsuit from a former high school teacher. He claims his health suffered multiple times, including conditions leading to hospital visits, as a result of mold exposure on the job. A judge Monday morning dismissed a $21 million lawsuit against Sullivan County Schools alleging adverse reactions to toxic black mold or Stachybotrys chartarum at Sullivan North High/Middle School, ruling the only valid remedy of the former employee who filed the suit was a worker's compensation claim. Former North High career technical teacher Michael Upchurch filed the lawsuit.