Until now, the admissibility of evidence in Illinois was primarily governed by the developing case law of reviewing court decisions. Recently, however, the Illinois Supreme Court adopted formal, codified Rules of Evidence. These Rules take effect January 1, 2010. A copy of the Rules may be found here:
As an older lawyer who has worked with the case law pronouncements of our evidentiary rules, I do not fully understand why formal, codified Rules of Evidence must now be imposed. This is especially true given the fact that the Rules of Evidence, as stated in the Commentary accompanying the Rules indicates that these codified Rules for the most part merely restate the case law development of evidentiary rules. In any event, this is the statement of the Supreme Court committee as to why these Rules were promulgated:
Currently, Illinois rules of evidence are dispersed throughout case law, statutes, and Illinois Supreme Court rules, requiring that they be researched and ascertained from a number of sources. Trial practice requires that the most frequently used rules of evidence be readily accessible, preferably in an authoritative form. The Committee believes that having all of the basic rules of evidence in one easily accessible, authoritative source will substantially increase the efficiency of the trial process as well as expedite the resolution of cases on trial for the benefit of the practicing bar, the judiciary, and the litigants involved. The Committee further believes that the codification and promulgation of the Illinois Rules of Evidence will serve to improve the trial process itself as well as the quality of justice in Illinois.
Truthfully, I don’t believe the presence of these Rules will significantly affect trial practice. Analogous to the adage, “the devil is in the details,” trial court rulings on the admissibility of evidence will depend on how the appellate courts interpret the general statements of law found in these Rules of Evidence. To the extent that will be founded upon the pre-Rules of Evidence case law, I guess I won’t have to throw out my case law trial book which is 600 pages long in 10 point type and which I have maintained for the last 25 years — thank goodness.