Marijuana Car Accident Lawyer in Michigan

Marijuana related car accident cases present issues that do not arise in a typical collision. THC can remain detectable after its impairing effects have diminished, there is no simple THC equivalent to the .08 blood alcohol standard, and legal marijuana use does not necessarily establish that a driver was impaired. Determining what happened requires looking beyond a test result and examining the driver’s behavior, the circumstances of the crash, and the evidence available at the scene.

The Clark Law Office represents people injured in serious car accidents throughout Michigan. Matthew R. Clark also has prior experience handling Michigan medical marijuana matters, giving him a unique perspective when marijuana law, impairment evidence, insurance, and accident liability overlap. Our focus is not simply on whether marijuana was present, but whether impairment can be proven and whether it actually contributed to the crash.

What Happens When Marijuana Is Involved in a Michigan Car Accident?

When marijuana is involved in a Michigan car accident, the case usually becomes more fact specific. The presence of THC may raise questions about impairment, but it does not automatically establish that a driver was unsafe behind the wheel or responsible for the collision.

The most useful way to evaluate these cases is to separate three different questions: Was marijuana present? Was the driver actually impaired? Did that impairment cause or contribute to the crash? Those issues are related, but they are not interchangeable.

For example, a driver could have THC in their system and still be struck by another motorist who runs a red light. In that situation, the THC result does not automatically make the first driver responsible. On the other hand, if marijuana impairment contributed to speeding, delayed reactions, unsafe lane changes, or another driving error that caused the crash, the impairment may become important evidence when determining liability.

This distinction is the foundation of a marijuana related accident claim. The analysis should focus on what the evidence shows about the driver’s condition, behavior, and role in causing the collision, rather than assuming that marijuana use alone decides the case.

Does Marijuana Automatically Make a Driver At Fault?

No. Marijuana use does not automatically make a driver responsible for a Michigan car accident. Fault is based on the conduct that caused or contributed to the collision, not simply on whether THC was present in someone’s system.

For example, a driver may test positive for THC but still have been obeying traffic laws when another vehicle runs a red light and causes the crash. In that situation, the positive test does not erase the other driver’s negligence. On the other hand, if marijuana impairment contributed to delayed reactions, unsafe lane changes, failure to yield, or another driving error, that evidence may become important when determining fault.

Michigan also follows comparative fault rules. If an injured person shares responsibility for causing the accident, their recovery can be affected by their percentage of fault. Marijuana use may be part of that analysis when there is evidence it contributed to the crash, but it should not be treated as a substitute for proving negligence.

The key question is not simply whether someone used marijuana. It is whether that use affected the driver’s behavior and played a role in causing the collision.

Is It Illegal to Drive High in Michigan?

Yes. Michigan law makes it illegal to drive while under the influence of marijuana, even though recreational marijuana itself is legal for adults.

From a car accident standpoint, the important issue is not simply whether someone used marijuana. The real question is whether that marijuana affected the person’s ability to drive safely and whether that impairment played a role in causing the crash. If a driver was weaving, reacting slowly, missing traffic signals, or making poor decisions behind the wheel, marijuana impairment may become an important part of proving negligence.

Medical marijuana does not give someone a free pass to drive impaired either. A valid medical marijuana card can affect how marijuana in a driver’s system is analyzed, but it does not protect someone who was actually impaired while driving.

In these cases, I would never rely on a positive THC result by itself. I would want to know what the driver was doing before the crash, what the police observed, what witnesses saw, what the testing showed, and whether the driving behavior actually fits with impairment.

Does Michigan Have a Legal THC Limit?

No. Michigan does not use a specific THC concentration to determine marijuana impairment the way it uses a .08 blood alcohol concentration for alcohol.

That is one of the biggest differences between marijuana and alcohol accident cases. A THC test can show that marijuana was present in a driver’s system, but the number by itself does not necessarily tell us whether that person was impaired when the crash occurred. In a real case, I would want to look at the test result together with the driver’s behavior, police observations, witness accounts, field sobriety testing, and the circumstances of the collision.

This is also why I would be cautious anytime an insurance company tries to treat a positive THC result as automatic proof of fault. The better question is whether the evidence shows that marijuana actually affected the driver’s ability to operate safely and contributed to the accident.

Michigan law also treats valid medical marijuana cardholders differently when marijuana is found in their system. In those cases, police must establish impairment rather than relying simply on the presence of marijuana.

Our guide to Michigan THC limits and testing takes a deeper look at what THC results can and cannot prove after a car accident.

How Is Marijuana Impairment Proven After an Accident?

Proving marijuana impairment after a Michigan car accident usually requires more than pointing to a positive THC test. In a serious injury case, I would want to know what the driver was doing before the crash, what police and witnesses observed, what testing was performed, and whether the driver’s behavior was consistent with impairment.

No single piece of evidence necessarily proves the issue. Instead, the strongest cases usually rely on several facts that support one another.

Our guide to proving marijuana impairment after a Michigan car accident explains these evidence issues in greater detail.

Can You Sue a Driver Who Was High?

Yes. If a driver was impaired by marijuana and their negligence caused your accident, you may be able to bring a claim against that driver for your injuries and losses.

The important point is that being high does not create liability by itself. We still have to prove that the driver did something negligent, such as running a red light, drifting out of a lane, following too closely, or reacting too slowly, and that this conduct caused the collision. Evidence of marijuana impairment can strengthen that case when it helps explain why the unsafe driving occurred.

In Michigan, an injured person may pursue a third party claim for pain and suffering when the legal injury threshold is met. Depending on the circumstances, a claim may also include certain economic losses that are not fully covered through Michigan No Fault benefits.

From my perspective, the strongest marijuana accident cases are not built around the argument that someone used marijuana. They are built around showing exactly how that impairment affected the person’s driving and how that driving caused the crash.

Our guide to marijuana accident fault and liability explains in more detail how negligence, impairment, comparative fault, and compensation work together in these cases.

Can You Still Get No Fault Benefits If Marijuana Was Involved?

In many cases, yes. Marijuana involvement does not automatically disqualify someone from receiving Michigan No Fault benefits after a car accident.

PIP benefits are separate from the question of who caused the crash. Depending on the coverage available, they may help pay accident related medical expenses, wage loss, and replacement services even when fault is disputed. The fact that marijuana was found in someone’s system does not by itself eliminate those benefits.

That distinction is important because people sometimes assume that being high, or even being accused of being high, means the insurance company can simply deny everything. That is not how I would analyze the claim. I would first look at whether the person qualifies for PIP benefits, what coverage applies, and whether any actual statutory exclusion affects the case.

Marijuana may still matter in a separate claim against an at fault driver, particularly if there is evidence that impairment contributed to the collision. But the No Fault claim and the liability claim should be evaluated separately.

What If You Had Marijuana in Your Own System?

Having marijuana in your system does not automatically mean you caused the accident or lose your right to compensation. The key question is whether marijuana actually impaired your driving and whether that impairment contributed to the collision.

If another driver runs a red light and hits you, a later positive THC test does not automatically shift fault to you. The crash still has to be evaluated based on what actually happened.

If there is evidence that marijuana affected your driving, Michigan’s comparative fault rules may come into play. Even then, the issue should be based on your actual conduct behind the wheel, not simply the fact that THC was present in your system.

What If the Other Driver Was High?

If you believe the other driver was high, you may still have a strong injury claim, but proving impairment requires preserving the right evidence.

Marijuana impairment can be difficult to prove later, especially if testing is delayed or the driver is never charged with an impaired driving offense.

Useful evidence may include police observations, witness statements, admissions by the driver, dash-cam or body-cam footage, marijuana found in the vehicle, toxicology testing, and the driver’s behavior before and after the crash.

You do not necessarily need a criminal conviction to pursue a civil injury claim. The question is whether the evidence shows that marijuana impairment contributed to the unsafe driving that caused the collision.

If marijuana impairment is suspected, I would want to investigate that issue early rather than assume the police report will contain everything needed to prove it.

Marijuana, Edibles and Other Forms of THC

The form of marijuana can matter because different products may affect how quickly impairment begins and how long it lasts.

Smoking or vaping marijuana generally produces effects more quickly, while edibles can take longer to take effect and may last longer. Concentrates can also contain much higher levels of THC than traditional marijuana flower.

From an accident perspective, the important issue is timing. I would want to know what was consumed, how much was used, when it was used, and whether the driver’s behavior at the time of the crash was consistent with impairment.

That is especially important with edibles because a driver may consume marijuana well before getting behind the wheel and still experience significant effects later. The type of product does not determine fault by itself, but it can become relevant when reconstructing whether marijuana contributed to the collision.

What Compensation May Be Available?

Marijuana does not create a separate category of compensation, but it can affect how fault is argued, how insurers value the claim, and whether your own conduct becomes part of the case.

The amount you may recover still depends on your injuries, insurance coverage, economic losses, and who caused the crash. The marijuana issue matters when it changes the evidence surrounding negligence or gives an insurance company a basis to dispute responsibility.

In a strong case, the value should be driven primarily by the severity of the injuries, the available insurance coverage, the financial losses, and the evidence establishing fault. Marijuana becomes important when it helps explain why the crash happened or when an insurer tries to use it to reduce responsibility.

What Should You Do After a Marijuana Related Car Accident?

If you suspect marijuana impairment played a role in the crash, protect your health first and preserve evidence of the other driver’s condition as early as possible.

In a serious injury case, I would begin investigating the marijuana issue early. Waiting until settlement negotiations to determine whether impairment can actually be proven may mean important evidence is already gone.

Why Marijuana Accident Cases Can Be Harder Than They Look

Marijuana accident cases are rarely as simple as a positive test followed by an automatic finding of fault.

THC may be present in a driver’s system, but the legal issue is whether marijuana actually impaired the driver and contributed to the collision. Michigan’s own impaired driving materials recognize that marijuana cases can require evidence of impairment rather than simply relying on presence alone in certain circumstances.

That means the strength of the case often comes from putting several pieces of evidence together. Toxicology results may matter, but so can driving behavior, police observations, witness testimony, video, statements made at the scene, and the physical evidence showing how the crash occurred.

In my experience, the mistake is focusing so heavily on marijuana that the underlying accident gets lost. I would still start with the same fundamental question we ask in every car accident case: What caused this crash, and what evidence proves it?

Frequently Asked Questions About Marijuana Car Accidents in Michigan

Michigan Marijuana Driving Laws and Sources