Where an administrative commission makes a determination of credibility for a witness, it is the exclusive function of the commission to make such a determination and, a circuit court that overrules this decision, absent the manifest weight of evidence, acts in error. The Illinois Appellate Court, 1st District, reversed and remanded a decision by Cook County Circuit Judge Margaret Ann Brennan. Jose Nunez was employed by Dig Right In Landscaping as a laborer and driver. On July 14, 2008, Nunez claimed that he injured …