R.C. 2901.21 sets basic requirements for being guilty of a crime in Ohio: a voluntary act (or a failure to act), and, for some offenses, a guilty state of mind called "culpability." This page explains the section in plain language, including a special rule for traffic offenses, and links to the official text.
Note: an older version of this page showed the version of the law in effect from 2000. The section was rewritten effective March 23, 2015. (R.C. 2901.21)
You are not guilty of an offense unless:
your liability is based on conduct that includes a voluntary act, or a failure to do something you were able to do, and
you had the required mental state for each element of the offense where the language defining the offense specifies one.
"Culpability" means purpose, knowledge, recklessness, or negligence, as defined in R.C. 2901.22. (R.C. 2901.21(F)(3); R.C. 2901.22)
Reflexes, convulsions, and movements during unconsciousness or sleep are involuntary acts. (R.C. 2901.21(F)(2))
If the language defining an offense does not specify any mental state and plainly shows a purpose to impose strict liability, no mental state is required. Strict liability for one division of a section does not by itself carry over to other divisions of that section. (R.C. 2901.21(B))
For most offenses, if the language defining an element related to knowledge or intent (or to which a mental state could fairly apply) says nothing about mental state and does not plainly impose strict liability, that element is proven only if the person acted recklessly. (R.C. 2901.21(C)(1))
That "recklessly" default does not apply to offenses defined in Title 45 of the Revised Code. (R.C. 2901.21(C)(2))
Title 45 covers motor vehicles, and includes Chapter 4511 (traffic laws) and Chapter 4510 (license suspensions). (Title 45, codes.ohio.gov)
In plain terms: do not assume the prosecutor must prove you acted recklessly for a traffic offense just because the traffic statute does not mention a mental state. What, if anything, must be proven about your state of mind depends on the specific offense and on court decisions about it. If this matters to your case, talk to a lawyer.
Voluntary intoxication cannot be considered in deciding whether you had a required mental state, and does not excuse a failure to act. Evidence of voluntary intoxication may be admissible to show whether you were physically able to do the act charged. (R.C. 2901.21(E))
This section was rewritten in 2015, and the older text said something different about mental state. This page summarizes the current law and links to it. If this summary and the official text differ, the official text controls.
Last verified: 2026-10-13