Some Ohio traffic laws say that proving one fact is "prima facie" evidence of another. This page explains what that means, the limits the Constitution puts on it, and where it shows up in Ohio speeding, street racing and license cases. It also explains when a "my speed was reasonable" argument does not apply.
Prima facie (Latin for "at first sight"): evidence that is enough to prove a fact unless something else in the case shows otherwise.
Presumption or inference: a rule that lets (or tells) the judge or jury conclude one fact from proof of another fact.
Permissive inference: the judge or jury may draw the conclusion, but does not have to.
Mandatory presumption: the judge or jury must draw the conclusion unless it is rebutted. These are treated much more strictly in criminal cases.
In an Ohio criminal or traffic case, you are presumed innocent until proven guilty beyond a reasonable doubt, and "the burden of proof for all elements of the offense is upon the prosecution." R.C. 2901.05(A).
You do not have to testify or make any statement. Traffic Rule 8(D)(3).
Ohio's Evidence Rule that makes a presumption shift the "burden of going forward" applies only in civil cases. Evid.R. 301. There is no matching rule for criminal cases; Evid.R. 302 is marked "[Reserved]." Ohio Rules of Evidence.
U.S. Supreme Court. In County Court of Ulster County v. Allen (1979), the Court explained that a permissive inference leaves the judge or jury free to accept or reject it and "does not shift the burden of proof." It is unconstitutional only if, on the facts of the case, there is no rational way to make the connection the inference allows. The Court also looked at whether the presumed fact is more likely than not to follow from the proved fact. Mandatory presumptions get closer scrutiny. 442 U.S. 140, Parts II and III.
Ohio Supreme Court. As far back as 1908, the Ohio Supreme Court held that the legislature "may not arbitrarily create a conclusive presumption of guilt against the accused." Hammond v. State, 78 Ohio St. 15 (1908).
Ohio's speed law, R.C. 4511.21, has three different kinds of rules. Your ticket should show which one you are charged under. If it does not, ask.
The basic rule, division (A). You may not drive faster (or slower) than is reasonable or proper for traffic, road surface, width of the road and other conditions, or faster than lets you stop within the "assured clear distance ahead."
Prima facie limits, divisions (B) and (C). Division (B) lists speeds that are "prima-facie lawful." Division (C) says it is "prima-facie unlawful" to exceed certain of those listed limits.
Absolute limits, division (D). Division (C) also says it is simply "unlawful" to exceed the limits in division (D). For example, division (D)(1) prohibits driving over 55 mph except where the statute allows a higher limit.
Why this matters. Ohio appeals courts hold that a charge under division (D) is a "per se" offense. If you are charged under (D), arguing that your speed was reasonable for the conditions is "not relevant." State v. Smead, 2024-Ohio-2222, ΒΆΒΆ 10-12 (Third District, affirming a conviction for 80 mph in a 55 mph zone).
If you are charged under a prima facie limit instead, how a "reasonable speed" defense works can be complicated. Talk to a lawyer before relying on it.
Ohio's street racing law says that driving two or more vehicles side by side above prima facie lawful speeds, or rapidly accelerating from a common start to such speeds, "shall be prima-facie evidence of street racing." R.C. 4511.251(A)(1). The offense itself is knowingly participating in street racing, stunt driving or a street takeover. R.C. 4511.251(B). It is a first-degree misdemeanor, and the court must suspend your license for 30 days to 3 years. The judge may not suspend the first 30 days of that suspension. R.C. 4511.251(C).
About State v. Schultz (1964). In State v. Schultz, 1 Ohio Misc. 81 (Toledo Mun. Ct. 1964), a Toledo municipal judge held that the prima facie sentence in the old "drag racing" version of this law was unconstitutional and dismissed the charge. Keep in mind:
It is a trial-court decision. It does not bind any other court.
The law has been rewritten since then (it is now "street racing"), but the current version still contains a prima facie evidence sentence, and division (B) now requires that the person acted "knowingly."
This review did not find any appeals court decision that follows or rejects Schultz.
In a no-license case, the prosecutor may ask to admit a LEADS report or BMV record showing your name, date of birth and Social Security number as prima facie evidence that you did not have a valid license. The law expressly lets you offer evidence to rebut it. R.C. 4510.12(B). If you did have a valid license, bring proof.
Ohio's OVI law includes both "under the influence" offenses and offenses defined by a measured alcohol concentration. For example, R.C. 4511.19(A)(1)(a) covers driving under the influence, while (A)(1)(b), (c) and (d) cover driving with a whole-blood, blood serum or plasma, or breath alcohol concentration in a stated range. R.C. 4511.19(A)(1). These concentration offenses are separate offenses defined by the test result. They are not presumptions. OVI cases are serious, cannot be paid through a traffic violations bureau (Traffic Rule 13(B)), and you should talk to a lawyer.
Read your ticket and note the exact code section and division. It decides which rules and defenses apply.
Go to court on time. If you miss court, the court can declare your license forfeited and issue a summons or warrant. R.C. 4510.22(A); Traffic Rule 7(A).
Ask about a lawyer. At arraignment the judge must tell you about your right to counsel and to a court-appointed lawyer at no cost if you cannot afford one. Traffic Rule 8(D)(1); Crim.R. 44.
Last verified: 2026-10-13