(1) A witness before a summary authority must give sworn evidence.
(2) However, if the summary authority is satisfied that a person is incapable of understanding that, in giving evidence, he or she is under a legal obligation to give truthful evidence:
(a) the person must not give sworn evidence; and
(b) the person may give unsworn evidence only if the summary authority is satisfied that the person understands the difference between the truth and a lie.
(3) If a witness before a summary authority is to give sworn testimony, the person must, subject to rule 17, be sworn by the administration of the following witness oath or affirmation:
Form of oath
I swear by Almighty God that the information I am about to give shall be the truth, the whole truth and nothing but the truth.
Form of affirmation
I do solemnly, sincerely and truly declare and affirm that the information I am about to give shall be the truth, the whole truth and nothing but the truth.