24. If a candidate or a junior engineer is unable to provide a certification form as required under section 21, he shall give the evaluator a written account of the reasons and circumstances preventing him from doing so. The evaluator shall indicate to him what other means of proof he may use in place of the certification form, notably a statement from his employer or his clients or other persons familiar with the work performed, a certificate from a Canadian association of professional engineers, or an inspection of his work carried out by a person designated by the evaluator.