(1) A person charged with an offence under sections 307 or 308 shall not be convicted, otherwise than on his or her own plea of guilty, except on the evidence in open Court of 2 witnesses at least to one overt act of the kind alleged or the evidence of one witness to one overt act and one other witness to another act relevant to the same kind of offence.
(2) This section does not apply in the case in which the act of treason alleged is in respect of the killing of the Governor General or a direct attempt to endanger the life or injure the person of the Governor General.