This bill codifies judicial deference to agency interpretation of statutes and rules that agencies administer. The bill establishes a 2-part test to be used by courts when reviewing an agency's interpretation of a statute it administers or a rule it has adopted. The bill requires the court to give effect to the statute's or rule's plain meaning if the statute or rule is unambiguous. If the language of the statute or rule is ambiguous, the court is required to defer to the agency if the statute or rule is within the scope of the agency's expertise and the agency's interpretation is reasonable.