In all hearings the testimony of witnesses shall be taken orally before the Board or hearing officer, unless otherwise provided by these rules.
Ga. Comp. R. & Regs. R. 20-14-.26
O.C.G.A. Secs. 43-3-8, 43-3-20, 43-3-21, 43-3-22, 43-3-23, 43-3-24, 43-3-28.