(1) If the application is in proper form and sets forth facts showing:

(a) A subminimum wage is necessary to prevent curtailment of the worker with a disability's opportunities for employment;

(b) The disability impairs the earning capacity of the worker for the work he or she is to perform, a certificate may be issued.

(2) The director or an authorized representative may require the submission of additional information to that shown on the application and may require the worker with a disability to take a medical examination where it is deemed necessary in order to determine whether or not the issuance of a certificate is justified.