Where a plaintiff’s attorney shows the jury a demonstrative exhibit during closing rebuttal without having produce it to the defense or laid any foundation for it prior to that point, and the exhibit had potential prejudicial effect, the error may be grounds for a mistrial if the case is closely balanced.The 1st District Appellate Court reversed and remanded a decision by Cook County Circuit Judge Charles P. Burns.On March 21, 2012, Ricky Brown was shot to death on the sidewalk outside his home. His neighbor, 13-year …