When a motion is based on facts not appearing of record, the Board or its designee may hear the matter on affidavits presented by the respective parties, but the Board or its designee may direct that the matter by heard wholly or partly on oral testimony.
Ga. Comp. R. & Regs. R. 480-43-.02
O.C.G.A. §§ 26-4-26, 26-4-27, 26-4-28, 50-13-13, 50-13-15.