Yes. Driving high is illegal in Michigan even though recreational marijuana is legal for adults 21 and older. Michigan law does not allow someone to operate a vehicle while under the influence of marijuana. Legal marijuana use and possession do not give a driver permission to drive while impaired, and medical marijuana patients are also prohibited from driving under the influence.
Michigan legalized recreational marijuana, but that did not legalize driving while high. This distinction causes confusion because marijuana can be lawfully purchased, possessed, and used by adults under Michigan law while driving under the influence remains illegal.
The rules also are not as simple as Michigan’s .08 BAC standard for alcohol. Marijuana raises different questions about THC, impairment, medical marijuana, chemical testing, and what police must establish before a driver can be convicted of an impaired driving offense. Understanding those distinctions is important whether you use marijuana legally or were injured by an impaired driver in a Michigan car accident.
- Driving high is illegal in Michigan. Recreational marijuana legalization did not legalize operating a vehicle while impaired.
- Legal marijuana use does not mean legal impaired driving. A person can lawfully use marijuana and still violate Michigan law by driving under the influence.
- Michigan does not use a simple THC impairment limit like .08 BAC. The presence and concentration of THC raise different legal and scientific questions than alcohol.
- Medical marijuana patients are not allowed to drive impaired. However, Michigan law treats the presence of marijuana differently for qualifying medical marijuana patients.
- Police look at more than a THC result. Driving behavior, officer observations, field sobriety testing, statements, and chemical evidence can all become part of a marijuana impaired driving investigation.
Is It Illegal to Drive High in Michigan?
Yes. Driving under the influence of marijuana is illegal in Michigan, even though recreational marijuana is legal for adults 21 and older. Legalization changed when adults may possess and use marijuana. It did not create a right to drive while impaired.
Michigan law prohibits operating a vehicle while under the influence of marijuana or while marijuana has visibly impaired the driver’s ability to operate the vehicle. The rule is broader than just cars. Michigan’s recreational marijuana law also does not authorize operating a motor vehicle, aircraft, snowmobile, off road recreational vehicle, or motorboat while under the influence of marijuana.
This is an important distinction because legal use and impaired driving are two separate questions. A person does not violate Michigan law merely because they legally used marijuana at some earlier point. The issue behind the wheel is whether marijuana affected their ability to operate the vehicle safely. When that impairment contributes to a collision, it can become an important issue in a marijuana car accident claim.
For drivers, the safest way to think about the law is simple: Michigan legalized marijuana. It did not legalize driving high. Michigan State Police continues to treat cannabis impaired driving as an impaired driving offense.
What Does “Under the Influence of Marijuana” Mean in Michigan?
Being “under the influence” is different from simply having used or possessed marijuana. The central issue is whether marijuana affected the driver’s ability to operate the vehicle safely. Michigan law expressly prohibits operating a vehicle while under the influence of marijuana, even when the marijuana itself was lawfully obtained or used.
Legal Marijuana Use vs. Illegal Marijuana Driving
| Situation | Legal in Michigan? | Important Distinction |
|---|---|---|
| Adult recreational marijuana use | Generally yes | Adults 21 and older may legally use marijuana within Michigan's rules |
| Driving after marijuana use | Depends | Prior use is not the same question as driving under the influence |
| Driving while marijuana impaired | No | Michigan prohibits operating a vehicle under the influence |
| Using marijuana while driving | No | Consumption while operating a vehicle is prohibited |
| Passenger smoking marijuana | No on a public way | Smoking in the passenger area is prohibited |
| Medical marijuana patient driving | Depends | Lawful medical use does not permit impaired driving |
Michigan’s marijuana law specifically separates lawful use from conduct behind the wheel. It also prohibits consuming marijuana while operating a vehicle and smoking marijuana within the passenger area of a vehicle on a public way. Unlike alcohol, marijuana impairment is not simply determined by comparing a driver’s THC concentration with a universal .08 style impairment threshold.
Is There a Legal THC Limit for Driving in Michigan?
No. Michigan does not have a THC concentration limit that works like the .08 BAC limit for alcohol. Michigan law prohibits driving while under the influence of a controlled substance or when a driver’s ability to operate the vehicle is visibly impaired, but it does not establish a specific THC concentration that automatically proves marijuana impairment.
That distinction matters because a THC result cannot simply be interpreted like a breath alcohol result. The amount detected and whether the driver was actually impaired are separate questions.
For a deeper explanation of blood tests, THC concentration, timing, and what a positive result can actually prove, see our THC Limits and Testing After a Michigan Car Accident guide.
Does a Medical Marijuana Card Change Michigan Driving Laws?
Yes, but a medical marijuana card does not give someone permission to drive while impaired. A qualifying patient can still violate Michigan law if marijuana affects their ability to operate a vehicle safely.
The important difference involves THC being present in the driver’s system. Michigan State Police states that drivers generally face Michigan’s controlled substance rules when a Schedule 1 substance is detected. However, there is an exception for a driver with a valid medical marijuana card. For a qualifying medical marijuana patient, the presence of marijuana alone is not enough. The evidence must establish that the driver was impaired by marijuana.
That distinction can be especially important because THC may remain detectable after marijuana was consumed. But the basic rule remains straightforward:
The card changes the legal analysis. It does not change the driver’s responsibility to operate safely.
A medical marijuana patient may lawfully use marijuana under Michigan law, but they still cannot legally drive under the influence.
Can You Drive With Marijuana in Your Car in Michigan?
Yes. Adults 21 and older can generally transport legally possessed marijuana in a vehicle in Michigan. Simply having marijuana in the car is different from using marijuana in the vehicle or driving while impaired.
Michigan law does not authorize consuming marijuana while operating a vehicle, smoking marijuana within the passenger area of a vehicle on a public way, or driving under the influence. In other words:
Marijuana in the car ≠ marijuana being used in the car ≠ driving high.
Medical marijuana can involve additional transportation requirements. For example, Michigan requires a qualifying patient transporting a marijuana infused product to keep it in a sealed and labeled package in the trunk or, if the vehicle has no trunk, somewhere that is not readily accessible from the interior. The label must include specific information about the product, including its weight, manufacturer, manufacture date, source, and date received.
Primary caregivers can face additional transportation and documentation requirements depending on who the marijuana infused product is being transported for.
The practical takeaway is simple: Michigan law may allow marijuana to be transported in a vehicle, but that does not mean it can be used in the vehicle or that someone can legally drive while impaired.
Can You Smoke Marijuana While Driving or Riding in a Car?
No. Michigan law does not allow a driver to consume marijuana while operating or being in physical control of a vehicle. It also prohibits smoking marijuana within the passenger area of a vehicle on a public way.
That means the rule applies to passengers too. A passenger cannot legally smoke marijuana in the passenger compartment simply because someone else is driving. The passenger area restriction also is not limited to a vehicle that is moving, so pulling over or parking on a public way does not automatically make smoking marijuana inside the vehicle legal.
The distinction is important: Michigan may allow adults to legally possess marijuana in a vehicle, but possession does not give the driver or passengers permission to smoke or consume it there.
For the driver, marijuana use can also create a separate and much more serious issue if it results in impaired driving.
How Do Police Determine Whether a Driver Is High?
Police do not rely on a single THC number to decide whether a driver is impaired by marijuana. Michigan State Police describes the investigation as a progression that looks at driving behavior, the officer’s observations, and performance on field sobriety tests. Based on that evidence, an officer may request chemical testing.
How Police Investigate Marijuana Impaired Driving
| Stage | What Police May Evaluate |
|---|---|
| Driving behavior | How the vehicle was being operated before the stop or crash |
| Driver observations | Appearance, behavior, statements, and other signs observed by the officer |
| Field sobriety testing | Performance on standardized roadside tests |
| Drug recognition evaluation | A detailed evaluation by a specially trained Drug Recognition Expert when appropriate |
| Chemical testing | Blood or other chemical evidence requested as part of the investigation |
Michigan also trains Drug Recognition Experts to evaluate suspected drug impairment. A DRE may assess behavior, vital signs, physical responses, coordination, judgment, and other indicators before forming an opinion about whether impairment is drug related. These evaluations are typically conducted after an arrest rather than at the roadside.
No single observation necessarily answers the impairment question. The strength of the investigation comes from how the evidence fits together.
For a deeper look at that evidence, see our Proving Marijuana Impairment After a Car Accident guide.
What Are the Penalties for Driving High in Michigan?
Driving high can carry serious criminal consequences in Michigan. Michigan State Police states that drivers with a Schedule 1 controlled substance in their system are subject to the same fines and penalties as drunk drivers, subject to the medical marijuana exception discussed above.
For a first impaired driving offense, potential consequences can include:
- Up to 93 days in jail
- A fine of up to $500
- Up to 360 hours of community service
- Up to 180 days of license suspension
- Six points on the driver’s license
What Happens If Driving High Causes a Car Accident?
When driving high causes a crash, the driver may face both criminal consequences and a separate civil injury claim. The criminal case focuses on whether Michigan’s impaired driving law was violated. The civil case focuses on whether marijuana impairment contributed to unsafe driving that caused another person’s injuries.
Those are related questions, but they are not the same. A marijuana OWI charge does not automatically establish civil liability, and the absence of a criminal charge does not necessarily prevent an injured person from pursuing a claim.
If marijuana contributed to the collision, determining responsibility requires looking at the driver’s impairment, conduct, and role in causing the crash. See our Fault and Liability in Michigan Marijuana Car Accidents guide for a deeper look at that issue.
The criminal case and the injury case answer different questions. Having handled marijuana cases in criminal court and serious injury cases on the civil side, I look beyond whether someone was charged. In an injury case, I want to know whether marijuana impairment affected the driver's conduct and whether that conduct caused the crash.
Frequently Asked Questions About Driving High in Michigan
Can You Get a Marijuana OWI Without Causing an Accident?
Yes. A crash is not required for a marijuana impaired driving charge in Michigan. A driver can face criminal consequences if the evidence establishes that they operated a vehicle under the influence of marijuana or while their ability to drive was visibly impaired.
Can You Refuse a Marijuana Chemical Test in Michigan?
A driver can refuse a requested chemical test, but there can be serious consequences. Michigan State Police states that refusing a chemical test results in license suspension under Michigan's implied consent law. Refusing the test does not simply make the impaired driving investigation disappear.
Can You Drive the Morning After Using Marijuana?
There is no universal number of hours after marijuana use when Michigan law automatically considers someone safe to drive. The legal issue is whether the person is impaired when they operate the vehicle. THC concentration also does not reliably correspond to driving impairment in the same way BAC does for alcohol.
Can You Drive High If You Have a Medical Marijuana Card?
No. A medical marijuana card does not authorize driving under the influence. Michigan law prohibits medical marijuana patients from operating a motor vehicle while under the influence of marijuana. The important distinction is that lawful medical use can change how the presence of marijuana in the driver's system is treated.
Resources and References
Attorney Review
Legally reviewed by
Matthew R. Clark focuses exclusively on personal injury and wrongful death cases throughout Mid-Michigan. He graduated from Michigan State University College of Law and trained at The Geoffrey Fieger Trial Practice Institute. His practice includes serious car accident, no-fault insurance, and catastrophic injury claims, and he has recovered millions for injured clients while providing direct attorney-level representation from start to finish.