A now- former Greene County school board member is under investigation by the TBI. Hugh Thomas Cobble resigned his seat Monday, but cited a health reason for the move… not the state investigation. The TBI confirms only the investigatiopn is active, but it will not say what the case is about. The school board isn’t talking, either. In his resignation letter, COblle said he was very proud of his 12 years of service to the school board and has deep admiration for the Greene County School System.