415 ILCS 45/20

The Agency shall, upon application and payment of the proper fee, issue a certificate of competency to any individual who holds an unexpired certificate of competency issued by any state or territory or possession of the United States or of any country, if:

(a) the requirements for the certificate of competency under which the certificate of competency was issued do not conflict with and are substantially equal to those specified by Sections 1 through 23 of this Act; and

(b) the particular state or territory or possession of the United States or country extends similar privileges to persons certified under Sections 1 through 23 of this Act.