IL SB3450

Allows evidence of prior driving under the influence (DUI) or aggravated DUI offenses to be admissible in cases where a defendant refused chemical testing as requested by law enforcement.

Courts must weigh the probative value of prior DUI evidence against potential prejudice, considering factors such as time proximity to the charged offense, factual similarity, and whether prior offenses resulted in conviction.

Prosecution must disclose prior DUI evidence, including witness statements or testimony summaries, a reasonable time before trial, unless the court excuses pretrial notice for good cause.

Permits proof of prior DUI offenses through specific conduct, reputation testimony, or expert opinion, with restrictions on prosecution use of reputation testimony until the defense presents such testimony first.