Bruce Alan Block, PLC

Represents clients in Grand Rapids, Michigan, and West Michigan communities of Ada, East Grand Rapids, Kentwood, Cascade, Wyoming, Byron Center, Lowell, Caledonia, Cascade, Rockford, Holland, Grand Haven, Grandville, Kent County, Ottawa County, Muskegon County, Barry County, Ionia County, Newaygo, Montcalm, and Allegan County.
We represent students from Calvin College, Aquinas College, Grand Valley State, Cornerstone University, Grand Rapids Community College, and Michigan State University.

Bruce Alan Block, PLC
Attorney and Counselor at Law
Phone: (616) 676-8770

1155 East Paris Ave. SE, Suite 300

Grand Rapids, MI 49546

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Drugged Driving THC Fact Page – OUID Lawyer

 Grand Rapids Operating under Influence of Marijuana Defense Lawyer


See our new page Michigan Roadside Saliva Drug Testing and DRE Experts


Marijuana, THC and Drugged Driving.


As more states enact medical marijuana laws, the new marijuana laws directly conflict with long-enshrined, strict Zero Tolerance prohibitions on driving under the influence of any Schedule 1 drug, which includes cannabis, more commonly known as marijuana.


It is important to note that ALL STATES prohibit driving a motor vehicle if your ability to operate a vehicle safely is compromised or impaired. If you are impaired by any substance, you are not allowed to drive, whether you are impaired by prescription drugs, alcohol, cocaine, marijuana, water, vitamins, etc. The important difference between drunk driving and drugged driving, is that with alcohol there is a clearly defined, federally mandated .08 blood alcohol content (BAC) limit. Contrary to public perception, it is not illegal to drink and drive so long as your ability to operate the car safely is not impaired AND you are not over the presumed drunk driving legal limit of .08.


In cases involving low alcohol readings under .08 or someone who is allegedly impaired by prescription drugs, the prosecuting attorney must prove  impairment of the driver beyond a reasonable doubt. Impairment can be shown by evidence the driver was weaving, driving over the fog line, erratic driving, failure to use headlights, speeding, and failure on the roadside sobriety tests. Assuming you are not over the .08 limit or are impaired by prescription drugs, a jury would deliberate and have to decide whether the state or local prosecutor had proved impairment beyond a reasonable doubt.


Despite numerous laws that allow persons to possess and use medical marijuana, most states and the federal government continue to classify marijuana as a Schedule 1 controlled substance, meaning that: (a) it has a high potential for abuse; (b) has no accepted medical use; and (3) there is no accepted safety standards for using the substance – even under medical supervision. No doctor prescriptions may be written for a Schedule 1 substance.


All fifty states have some form of Zero Tolerance laws. Zero Tolerance laws give the same drunk driving penalties to those who operate a motor vehicle with any amount of a Schedule 1 drug or illegal substance in their bodies. Unfortunately, the states that have passed recreational marijuana laws or medical marijuana laws have not been as fast to change or modify their Draconian Zero Tolerance laws. This leads to absurd results, where a patient is state-authorized to use medical cannabis but unable to drive with active THC (a schedule 1 drug) in their bloodstream or the marijuana metabolite 11-Carboxy-THC. It is unlikely anyone would seriously posit that someone with THC should be treated the same as someone stone cold drunk, high on heroin, LSD, or ecstasy. And yet, this is the present reality in many states.


Drug Recognition Expert (DRE).


As more states legalize the possession and use of marijuana for medical and recreational purposes, the police are starting to take a closer look at persons who are driving while impaired by marijuana. This is somewhat virgin territory. The police always used to focus on alcohol, the beverage of choice for most drunk drivers. However, the number of drunk drivers is decreasing every year. The new focus of the police is on drug impaired drivers. The penalties for driving impaired by marijuana or any substance is the same as alcohol. Police are being sent to special classes so that they can detect when a driver is under the influence of marijuana or some other illegal or legal drug. After about a week of classes, these police officers are then deemed to be “experts.” This is not a joke, and if you run into a case where you are accused by a police officer who is supposedly a so-called “Drug Recognition Expert” you should seek legal counsel immediately, especially someone who has dealt with DRE officer cases before. We have. call us. Read more information here: DRE Experts


Driving Under the Influence of THC – Zero Tolerance in Michigan.


With the recreational marijuana law taking effect December 2018, so long as you are age 21 or older, there is no zero tolerance for marijuana in Michigan. The Michigan Regulation and Taxation of Marijuana Act (MRTMA) allows a person age 21 years or older to operate a car or boat with active THC in their body, so long as it does not affect their ability to safely drive.


Prosecutors can no longer simply convict under the Zero Tolerance law by producing a blood test result showing active THC in the bloodstream. Instead, a prosecutor has a much higher and harder burden of proving, beyond a reasonable doubt, that the person’s driving ability was actually impaired by the active THC in their body. In other words, the government must show the ability to operate a car was materially impaired by the active THC (e.g., weaving, excessive speed, erratic driving, etc).


Medical Marijuana States.


A few medical marijuana states have taken action to correct this perceived unfairness. On the date of writing, Colorado had introduced a 5 ng/ml blood standard that a jury can use to “reasonably infer” that the driver was impaired by THC. Both Nevada and Ohio have per se impaired limits of 2 ng/ml of blood; Montana has a per se limit of 5 ng/ml; and Pennsylvania had a 1 ng/ml THC “guideline,” meaning a THC blood level can be introduced as evidence of impairment, but is not an automatic limit. In contrast, Washington State instituted a 5 ng/ml of blood per se limit. PLEASE NOTE: marijuana and driving laws are changing rapidly. To keep this page current on all 50 states on a daily basis is beyond its scope. These amounts were accurate when this page was written, but do NOT rely on them; seek out the law in the state where you intend to drive and educate yourself. 


No Reliable Test or Studies as to THC Impairment Levels.


Unlike alcohol, there are not enough indicators that lead to setting a specific per se intoxication/impairment limit for active THC. The effects of alcohol are rather predictable and the studies on alcohol and driving are innumerable. Marijuana and its effects on drivers is much more subjective and individualized. The studies that do exist tend to show that users of marijuana act the opposite of drunk drivers. Drivers with marijuana in their bodies tend to slow their driving, allow more distance between cars, and drive more carefully. Unlike alcohol, which is a stimulant and has been shown to limit a drinkers inhibitions and make them feel they are superman (or superwoman) and thus impervious to harm, marijuana tends to act more like a sedative and its users become more cautious and careful.


However, the majority of other states still have zero tolerance laws on the books, and in these states, driving a motor vehicle with any amount of active-THC in the bloodstream can lead to a drugged driving conviction, just as if you were driving over the alcohol legal limit of .08.


Arbitrary THC Levels.


There seems to be a lot of legislative will to set arbitrary active THC standards. This may be in part, because marijuana is highly controversial and because there are few scientific studies that are considered unbiased. To date there are simply no studies that demonstrate with any reasonable certainty a certain amount of THC causes impairment. The legislators that passed laws setting a .05 ng/ml limit would no doubt readily admit that this amount is not based on any scientific study or data.


How Long after I Smoke Marijuana Will Active THC be in my Body?


There is no easy answer. There is some scientific support that shows that smoking cannabis acutely affects driving abilities for the first hour. Active THC levels begin drop over the next two hours, followed by a residual period which lasts 2-3 or more hours. If marijuana is orally ingested, THC levels peak 2-3 hours later.

Assuming that the cannabis ingested is not a high THC strain, THC levels should drop below 5 ng/ml about 4 hours.


Active THC vs 11-Carboxy-THC.


The Michigan Supreme Court (People v Feezel, 2010) ruled that the marijuana metabolite “11-carboxy-THC” (the substance that stays in your body for up to 28 days) was a ‘derivative’ of marijuana  As a derivative, 11-carboxy-THC is not a Schedule 1 controlled substance. Thus, a person who only has the metabolite cannot be prosecuted for zero tolerance drugged driving. Thus it not illegal to drive with 11-carboxy-THC metabolite in your body in Michigan. But be aware that driving with the marijuana metabolite is still illegal in many states.


Michigan’s Recreational Marijuana Law and Driving.


Michigan voters overwhelmingly passed a ballot proposal in 2018 which allows for non-medical use of marijuana. The recreational marijuana law will protect those who drive with active THC in their bodies who do not have a medical marijuana card. The recreational marijuana law has an explicit supremacy clause that will protect the recreational user who operates a car with active THC in their bodies, as it clearly overrules the Zero Tolerance statute.




Contact Us


Attorney Bruce Alan Block is a Grand Rapids, Michigan criminal defense lawyer who has successfully handled drugged driving, OUID, OWI, drunk driving, drugged driving, impaired driving, driving while impaired, driving while visibly impaired, and more. He has handled actual court cases involving drug recognition experts (DRE) and knows how to properly prepare and cross-examine them. Put his years of experience to work for you.


If you or a family member has been charged with or accused of a drugged driving crime you need immediate advice from an experienced criminal defense attorney. Contact our Grand Rapids, Michigan, drunk driving and drugged driving criminal defense lawyer at (616) 676-8770.




Bruce Alan Block, PLC

Attorney and Counselor at Law
1155 East Paris Ave SE, Suite 300 Grand Rapids, MI 49546
Phone: (616) 676-8770

Serving Clients throughout Western Michigan, in Grand Rapids, Ada, East Grand Rapids, Kentwood, Cascade, Wyoming, Byron Center, Wyoming, Caledonia, Cascade, Rockford, Holland, Grand Haven, Grandville, Kent, Barry, Ottawa, Muskegon and Ionia County. We represent college students from Calvin College, Aquinas, Grand Valley State University, Cornerstone University, Grand Rapids Community College, Michigan State University, and Western Michigan University.

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