Illinois Statutes Chapter 725. Criminal Procedure § 5/115-7.3. Evidence in certain cases

(a) This Section applies to criminal cases in which:

(b) If the defendant is accused of an offense set forth in paragraph (1) or (2) of subsection (a) or the defendant is tried or retried for any of the offenses set forth in paragraph (3) of subsection (a), evidence of the defendant's commission of another offense or offenses set forth in paragraph (1), (2), or (3) of subsection (a), or evidence to rebut that proof or an inference from that proof, may be admissible (if that evidence is otherwise admissible under the rules of evidence) and may be considered for its bearing on any matter to which it is relevant.

(c) In weighing the probative value of the evidence against undue prejudice to the defendant, the court may consider:

(d) In a criminal case in which the prosecution intends to offer evidence under this Section, it must disclose the evidence, including statements of witnesses or a summary of the substance of any testimony, at a reasonable time in advance of trial, or during trial if the court excuses pretrial notice on good cause shown.

(e) In a criminal case in which evidence is offered under this Section, proof may be made by specific instances of conduct, testimony as to reputation, or testimony in the form of an expert opinion, except that the prosecution may offer reputation testimony only after the opposing party has offered that testimony.

(f) In prosecutions for a violation of Section 10-2, 11-1.20, 11-1.30, 11-1.40, 11-1.50, 11-1.60, 12-3.05, 12-4, 12-13, 12-14, 12-14.1, 12-15, 12-16, or 18-5 of the Criminal Code of 1961 or the Criminal Code of 2012,  2 involving the involuntary delivery of a controlled substance to a victim, no inference may be made about the fact that a victim did not consent to a test for the presence of controlled substances.