Last verified: March 2026
The Problem: Ohio's Outdated THC Driving Law
Ohio's current OVI (Operating a Vehicle Impaired) law for cannabis was written during the medical-only era and has two major issues:
- The 2 ng/mL per se limit: Ohio currently sets the legal limit for active THC (delta-9) in blood at just 2 nanograms per milliliter. This is one of the lowest thresholds in the country. Regular cannabis users can exceed 2 ng/mL for days after their last use — long after any impairment has worn off.
- Metabolite-based charges: Ohio also allows OVI charges based on the presence of THC metabolites (THC-COOH), which are inactive breakdown products that can remain in the body for weeks after last use. These metabolites have zero psychoactive effect and indicate only past use, not current impairment.
The combination means a legal cannabis consumer who used cannabis a week ago can be charged with OVI based on a blood test — even if they are completely sober while driving.
What SB 55 Would Change
| Provision | Current Law | SB 55 |
|---|---|---|
| Active THC limit | 2 ng/mL | 5 ng/mL |
| Metabolite charges | Allowed (THC-COOH) | Eliminated |
The 5 ng/mL threshold aligns with Colorado, Washington, and Montana — states that have had legal cannabis for years and settled on 5 ng/mL as a more reasonable per se limit. Eliminating metabolite charges is equally important: it means people cannot be convicted of OVI based solely on inactive THC that indicates past — not current — use.
Legislative Status
SB 55 has had a remarkably bipartisan journey — up to a point:
| Stage | Status |
|---|---|
| Senate vote (October 2025) | Passed unanimously |
| House Judiciary Committee | Stuck — no vote scheduled as of March 2026 |
A unanimous Senate vote is extraordinary for any cannabis-related legislation. Every Republican and every Democrat in the Ohio Senate agreed this reform was needed. The bill was then referred to the House Judiciary Committee, where it has sat without a scheduled vote since October 2025.
Why It Matters
Ohio legalized recreational cannabis for adults 21 and older. Hundreds of thousands of Ohioans now use cannabis legally. But the state's driving laws have not been updated to reflect this new reality. Under current law:
- A patient who uses medical cannabis for chronic pain can test above 2 ng/mL for days after their last dose
- A recreational user who consumed cannabis on Friday night can test positive for metabolites the following Wednesday
- Neither person is impaired while driving, but both can be charged with OVI
The metabolite provision is particularly unjust. THC-COOH is a waste product with no psychoactive effect. Using it as the basis for an impaired-driving charge is the equivalent of charging someone with drunk driving because they consumed alcohol last week. No serious toxicology expert defends metabolite-based impairment claims.
What You Can Do
SB 55 needs to move through the House Judiciary Committee. Ohio residents can:
- Contact their state representative and urge a committee vote
- Contact the House Judiciary Committee chair directly
- Reference the unanimous Senate vote as evidence of bipartisan support
The bill's biggest asset is its Senate record. Unanimity is rare, and it removes the usual partisan objections. The obstacle is scheduling — getting the House committee to prioritize the bill and bring it to a vote.
Until SB 55 passes, Ohio's THC driving limit remains 2 ng/mL — one of the lowest in the country. Regular cannabis users can exceed this threshold for days after last use. If you use cannabis in Ohio, be aware that you could test above the legal limit even when you are not impaired.
For in-depth cannabis education, dosing guides, safety information, and research summaries, visit our partner site TryCannabis.org