Supreme Court Rules 2000

If a deponent appears to the person before whom an affidavit is taken to be illiterate or blind, that person is to certify in the jurat – that the affidavit was read in the presence of that person to the deponent; and that the deponent seemed to understand it fully; and that the deponent made his or her signature or mark in the presence of that person.

An affidavit of a person who is illiterate or blind is not to be used in evidence in the absence of a certificate in accordance with subrule (1) unless the Court or a judge is otherwise satisfied of the matters referred to in that subrule.