205 ILCS 5/48.5: Reliance on Commissioner.

(a) The Commissioner may issue an opinion in response to a specific request from a member of the public or the banking industry or on his own initiative. The opinion may be in the form of an interpretive letter, no-objection letter, or other issuance the Commissioner deems appropriate.

(b) No bank or other person shall be liable under this Act for any act done or omitted in good faith in conformity with any rule, interpretation, or opinion issued by the Commissioner of Banks and Real Estate, notwithstanding that after the act or omission has occurred, the rule, opinion, or interpretation upon which reliance is placed is amended, rescinded, or determined by judicial or other authority to be invalid for any reason.