Marc Seidler served as an assistant state’s attorney for Lake County (defendant) before joining the law firm Rudnick and Wolfe (the firm) in February 1981. A few months later, the firm sued Lake County on behalf of LaSalle National Bank (plaintiff). Seidler stated in an affidavit that he had not disclosed any confidential information relevant to the case to anyone associated with the firm. However, the firm did not establish any specific screening arrangements to prevent inadvertent sharing of confidential information until the county moved to disqualify the entire firm six months later. The trial court found that Seidler’s past association with the county created an appearance of impropriety and disqualified the entire firm. The bank appealed.