5 ILCS 235/15

An emergency responder from outside this State who holds a license, certificate, or other permit recognized or issued by another state shall be deemed licensed, certified, and permitted to render mutual aid during a mutual aid emergency within this State pursuant to a mutual aid agreement authorized by this Act, if the emergency responder is (i) acting within the scope of his or her license, certificate, or permit and within the scope of what an equivalent license, certificate, or permit from or recognized by this State would authorize and (ii) acting pursuant to a request for mutual aid made pursuant to a mutual aid agreement authorized by this Act.