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Ohio Senate Passes Marijuana DUI Bill Aimed At Protecting Drivers Who Aren’t High Behind The Wheel From Prosecution
Oct 16, 2025
Marijuana Moment
Marijuana Moment
*“Right now we’re testing inactive metabolites, mostly through urine, and
it’s really not accurate. The inactive metabolites don’t show impairment,
it just shows whether or not you used it [in the past].”*
*By Jake Zuckerman, Signal Cleveland*
*This story was originally published by Signal Cleveland. Sign up for their
free newsletters at SignalCleveland.org/subscribe.*
The Ohio Senate unanimously passed legislation last week to overhaul the
way that prosecutors must prove whether a person was driving under the
influence of marijuana.
Ohio, like most the rest of the nation, has liberalized its marijuana laws
over the past decade, now allowing recreational and medical use of the drug
in a variety of forms.
This has posed a tricky challenge of setting a legal standard that
prohibits driving while under the influence of marijuana, while not
ensnaring people who are sober on the road but have used the drug in the
past few days.
And unlike with alcohol’s well established limit of .08 percent of blood
alcohol content as the legal threshold for impaired driving, the science
around cannabis concentration in the blood is far murkier. Some people with
high concentrations wouldn’t exhibit behavioral signs of impairment, while
some people with low concentrations would, studies show.
“The current law allows for the conviction of innocent people, 100 percent
straight out,” said Tim Huey in an interview, who lobbied for the bill on
behalf of fellow DUI defense attorneys.
*What the bill would do for drivers of accused of being high*
Senate Bill 55, if agreed to by the Ohio House and the governor, would
bring two big changes for people accused of driving while high. For one, it
ends prosecutors’ current ability to convict drivers for driving under the
influence based solely on the presence of marijuana “metabolites” in a
person’s system.
Metabolites are the non-psychoactive byproduct of marijuana produced as the
body breaks down (metabolizes) marijuana. Those metabolites can linger in a
person’s system as long as 30 days after use, according to researchers and
defense attorneys who support the bill.
Instead, police and prosecutors must show the presence of Delta 9-THC, the
active ingredient that produces the high sensation.
The legislation also gives people accused of driving while high an
opportunity to rebut the evidence against them if a comparatively lower
concentration of marijuana is detected in their systems. That’s opposed to
the “per se” system in current law, where a positive drug test almost
guarantees a conviction.
“Basically right now we’re testing inactive metabolites, mostly through
urine, and it’s really not accurate,” said Sen. Nathan Manning, a Lorain
County Republican and former prosecutor who has pushed the legal change for
years. “The inactive metabolites don’t show impairment, it just shows
whether or not you used it [in the past].”
Several sources described the legal thresholds set in the legislation as
the product of more art than science, and a compromise between prosecutors
and defense attorneys who lobbied the bill.
*Half baked?*
Ohio legalized marijuana for medicinal use in 2019 and for adult
recreational use in 2023, joining a list of 37 other states that allow some
form of legal marijuana use. Senate Bill 55 would be the first major update
to the marijuana DUI laws since then.
The roadways pose one of the biggest risk zones for a newly legalized
intoxicating substance. Marijuana has been associated with slower reaction
times, difficulty maintaining lane positioning, divided attention and other
behaviors that worsen driving performance.
The problem, as noted in a 2017 National Highway Transportation Safety
Administration research review, is that available evidence shows a weak
correlation between blood THC concentration and measurable impairment.
The AAA Foundation for Traffic Safety in 2016 conducted a similar study and
found that per se laws like Ohio’s “cannot be scientifically supported.”
While the organization opposes the legalization of marijuana due to what it
describes as negative traffic safety implications, it opposes any per se
DUI law unless prosecutors pair it with behavioral evidence of impairment
like weaving between lanes or bloodshot eyes.
*Legislation calls for THC testing, new thresholds*
The proposed law still allows for per se convictions of marijuana. However,
it raises that threshold from 2 nanograms per milliliter of blood to 5
ng/ml. In other words, a drug test detecting higher than that will yield a
guaranteed conviction, assuming no legal roadblocks arise.
For those with concentrations of 2- to 5 ng/ml, juries and judges can
“infer” that a driver was impaired. However, that driver can introduce
evidence, summon witnesses, or testify on their own behalf to rebut that
inference.
The new standard doesn’t absolutely rule out the possibility of a false
positive, according to Alfred Staubus, a pharmacist and forensic
toxicologist, However, he said in an interview that ending a legal system
where the presence of marijuana metabolites can automatically trigger a
conviction is a massive step forward.
“If you have it much higher than [5 ng/ml], then there will be a large
group of people that are impaired that will not be convicted on a per se
charge,” he said. “If you have it down to 2, then there’s going to be a
large group of people that are not impaired but will be convicted.”
*Prosecutors disagree*
The Ohio Prosecuting Attorneys Association has successfully thwarted
similar legislation over the past few years. This time around, the
prosecutors declined to formally oppose the bill in committee.
Lou Tobin, the association’s executive director, said in an email that
Manning, the sponsor, made changes the prosecutors asked for including
maintaining a per se threshold for THC concentration in blood, and
including various THC-knockoff products like Delta-8 THC (a similar product
that has avoided regulation via a legal loophole).
He disputed the notion that testing for metabolites produces false positive
convictions.
“People aren’t being randomly pulled over and subjected to urine tests,” he
said. “They’re pulled over because the officer had some reason to suspect
that they were driving impaired and then their urine is tested because
there was probable cause that confirmed the suspicion.”
He said the prosecutors would be fine with a zero tolerance approach to any
level of THC in the bloodstream. But keeping at least some limit, as the
bill does, acts as a deterrence. Plus, he noted that the law still allows
for OVI convictions for those who show signs of impairment while driving or
speaking with officers.
“Someone who has used marijuana recently should assume the risks of that if
they get behind the wheel,” he said.
The post Ohio Senate Passes Marijuana DUI Bill Aimed At Protecting Drivers
Who Aren’t High Behind The Wheel From Prosecution appeared first on Marijuana
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