The prosecuting entity must prove the ordinance violation by a preponderance of the evidence;
meaning it is more likely true than not that the violation occurred.
Rule 578.Burden of Proof
Article V. Rules on Trial Court Proceedings in Traffic and Conservation Offenses, Ordinance Offenses, Petty Offenses, Misdemeanors, and Civil Law Violations · Part E. Rules and Procedures for Non-Traffic/Non-Conservation Ordinance Violations · Last amended 2011 · Last verified July 20, 2026
In one sentenceRule 578 holds municipalities to the civil standard of proof — a preponderance of the evidence — when prosecuting an ordinance violation, not the tougher criminal standard.
Full Text of Ill. S. Ct. R. 578
Plain-English Summary
To win an ordinance violation case, the prosecuting entity only has to show that the violation is more likely true than not — the preponderance-of-the-evidence standard used in civil cases. That's a lower bar than the beyond-a-reasonable-doubt standard that applies in a criminal trial.
The rule reflects long-standing Illinois case law treating ordinance prosecutions as civil in form, even though they punish rule-breaking much the way a criminal case would. It applies only to ordinance violations under Rules 570 through 579 — traffic and conservation cases follow different rules entirely.
Frequently Asked Questions
What does the city have to prove to win an ordinance violation case?
That the violation is more likely true than not — the preponderance-of-the-evidence standard.
Is that the same standard used in a criminal trial?
No, criminal cases require proof beyond a reasonable doubt, a higher bar than an ordinance case.
Why is the standard lower for ordinance violations?
Because these cases are treated as civil in form, even though they punish rule-breaking the way a criminal case would.
Does this affect my chances of beating the ticket?
It can — a lower burden makes it easier for the prosecuting entity to win than it would be in a criminal trial.
Does the preponderance standard apply to traffic tickets too?
No, Rule 578 only governs ordinance violations under Rules 570 through 579; traffic and conservation cases follow different rules.
Committee Comments and Commentary
(December 7, 2011)
This rule restates case law which holds that the burden of proof in ordinance violation cases is the civil law standard of preponderance of the evidence rather than the criminal standard of beyond a reasonable doubt. City of Mattoon v. Mentzer, 282 Ill. App. 3d 628, 634 (4th Dist. 1996) (citing Chicago v. Joyce, 38 Ill. 2d 368, 373 (1967)).
Amendment History
Adopted December 7, 2011, effective immediately.
Source & verification. Rule text, official Committee Comments, and
amendment history are reproduced verbatim from the Illinois Supreme Court Rules,
promulgated by the Supreme Court of Illinois. Last verified July 20, 2026.
· Official source
Also known as: burden of proof ordinance violation Illinoispreponderance of the evidence tickethow to win a municipal ordinance casestandard of proof for a parking ticket