Minnnesota Marijuana / Cannabis DWI Chages Defense Lawyer

Marijuana Is Legal in Minnesota. Driving While Impaired Is Not.

Legal recreational marijuana has changed Minnesota’s criminal laws, but it has also created confusion about what drivers can legally do with cannabis in their vehicles.

Can you keep a THC vape pen in your center console? Can a passenger smoke marijuana while you drive? Does cannabis have to be stored in the trunk? And can a police officer search your car simply because it smells like weed?

The answers matter. Even if you are not impaired, the way cannabis is stored or used in your vehicle can lead to criminal charges. And when police suspect marijuana-impaired driving, an ordinary traffic stop can quickly become a DWI investigation.

At North Star Criminal Defense, we defend people accused of cannabis-related DWI offenses and other criminal violations involving marijuana in Minnesota. We understand the differences between lawful possession, open-package violations, and impaired driving—and why those distinctions matter when challenging criminal charges.

Can You Get a DWI for Marijuana in Minnesota?

Yes. Minnesota law prohibits driving, operating, or being in physical control of a motor vehicle while under the influence of cannabis, THC, or other intoxicating substances.

Although adults 21 and older can legally possess and consume marijuana under certain circumstances, legalization does not permit impaired driving.

However, using marijuana and being impaired by marijuana are not necessarily the same thing.

Unlike alcohol, which has a defined legal concentration limit for most drivers, Minnesota does not establish a specific THC blood concentration that automatically makes someone guilty of cannabis DWI.

Instead, prosecutors generally must establish that the driver was under the influence of cannabis at the relevant time.

Evidence may include:

• Observations about the driver’s behavior, coordination, speech, or appearance.
• Driving conduct before the traffic stop.
• Statements about recent marijuana consumption.
• Performance on field sobriety tests.
• Observations made by a drug recognition evaluator.
• Blood or urine testing identifying THC or related compounds.
• Other circumstances suggesting impairment.

Each of these forms of evidence can raise questions about reliability, interpretation, or whether the driver’s abilities were actually impaired.

Is It Illegal to Smoke Marijuana in a Car in Minnesota?

Yes. Minnesota prohibits using marijuana in a motor vehicle on a street or highway.

This restriction applies even when marijuana possession would otherwise be legal.

A person does not have to be driving under the influence to violate Minnesota’s cannabis vehicle-use restrictions. Smoking marijuana in a vehicle can create a separate criminal issue regardless of whether the driver is impaired.

For example, someone who smokes marijuana while sitting in a parked vehicle on a public street may face a cannabis-use violation even if the vehicle is not moving.

The situation becomes more serious when police believe the person was driving or in physical control of the vehicle while impaired.

Can a passenger smoke weed while someone else drives?

Generally, no. Minnesota’s prohibition on cannabis use in a motor vehicle on a street or highway is not limited to the driver.

A passenger smoking marijuana or using a THC vape can create legal problems even if the driver has not consumed cannabis.

Minnesota law provides limited exceptions for certain passenger transportation vehicles, but those exceptions generally do not apply to an ordinary private passenger car.

Importantly, a passenger’s marijuana use does not automatically establish that the driver was impaired.

Can You Have a THC Vape Pen in Your Car?

A THC vape pen is not automatically illegal to possess simply because it is inside a vehicle. However, the circumstances matter.

Minnesota’s cannabis open-package law applies to cannabis products, which can include THC vape cartridges and other cannabis concentrates.

A vape cartridge that has been opened or partially used may violate the open-package law if it is kept in the passenger compartment while the vehicle is on a street or highway.

Consider these situations:

An unopened THC vape cartridge in compliant retail packaging: Possession may be lawful, assuming the person can legally possess the product and the packaging complies with Minnesota law.

A partially used THC vape in the center console: This can create an open-package violation even when the driver is completely sober.

A THC vape in the driver’s pocket: A used or opened cartridge may create an open-package issue when the driver possesses it inside the vehicle.

A passenger actively vaping THC: Using cannabis inside an ordinary vehicle on a street or highway is prohibited, regardless of whether the passenger is driving.

A used THC cartridge stored in the trunk: The trunk exception to Minnesota’s open-package law may apply, provided the other applicable possession laws are satisfied.

A particularly important distinction is that possessing an open THC vape does not automatically prove cannabis-impaired driving. The prosecution must still establish the elements of any separate DWI charge.

Does Marijuana Have to Be Kept in the Trunk in Minnesota?

Minnesota’s cannabis open-package law makes the location and packaging of marijuana especially important.

Under Minnesota Statute § 169A.36, it is generally unlawful to possess cannabis in a private vehicle on a street or highway when the product is improperly packaged, has been removed from its original packaging, has an opened or broken seal, or has been partially consumed.

The statute provides an exception for packages kept in the trunk.

For vehicles without a traditional trunk, such as certain SUVs or hatchbacks, the exception applies to an area not normally occupied by the driver or passengers. A glove compartment or utility compartment does not qualify as an area outside the passenger compartment.

What about unopened marijuana from a dispensary?

Cannabis in unopened, legally compliant packaging can generally be transported in the passenger compartment by an adult who is legally permitted to possess it.

However, once that package has been opened, the rules change.

The simplest precaution is to keep marijuana and THC products in the trunk or an appropriate cargo area, particularly after the original packaging has been opened.

What if marijuana is in a backpack, purse, or glove box?

Putting marijuana in a backpack or purse does not automatically satisfy Minnesota’s open-package law.

If the marijuana is in opened or otherwise noncompliant packaging, storing it in a bag inside the passenger compartment generally does not eliminate the potential violation.

Similarly, placing cannabis inside the glove compartment or center console does not qualify for the trunk exception.

These rules can surprise drivers who reasonably assume that possessing legal marijuana is no different from carrying other legally purchased products.

Can Police Search Your Car Because It Smells Like Marijuana?

The odor of marijuana alone does not authorize police to search your vehicle in Minnesota.

This is one of the most important legal changes affecting cannabis-related traffic stops.

Under Minnesota Statute § 626.223, a police officer’s perception of cannabis odor cannot serve as the sole basis for searching a vehicle, its occupants, or its contents.

The Minnesota Supreme Court also addressed this issue in State v. Torgerson, concluding that marijuana odor alone, without additional supporting circumstances, did not establish probable cause for a warrantless vehicle search.

But this protection has limits.

What if police smell marijuana and see a vape pen or an open container?

Police may have grounds to investigate further when the smell of cannabis is accompanied by other evidence suggesting a crime.

Examples might include:

• An open or partially used container of marijuana in plain view.
• A driver admitting to recently smoking marijuana.
• Observations suggesting impaired driving.
• A passenger actively smoking or vaping THC.
• Other evidence indicating an open-package violation.

The legality of a search depends on the totality of the circumstances and the specific justification officers relied upon.

In 2026, the Minnesota Court of Appeals addressed this distinction in State v. Roberson, concluding that an observed cannabis open-package violation provided probable cause to search a vehicle for additional evidence of similar violations.

In other words, although smelling marijuana alone is not enough to justify a vehicle search, evidence of an actual open-package violation can change the legal analysis.

Can Police Investigate You for DWI Because They Smell Weed?

The legal standard for investigating impaired driving is different from the standard for searching a vehicle.

An officer who smells marijuana may begin asking questions about cannabis use. Whether the officer can lawfully expand a traffic stop into a DWI investigation depends on the facts and the legal justification for doing so.

Police may consider additional circumstances, including:

• Erratic driving or traffic violations.
• Physical or behavioral signs of possible impairment.
• Admissions of recent cannabis consumption.
• Observations of active marijuana use.
• Other specific facts supporting suspicion of impaired driving.

The presence of marijuana odor does not automatically establish that the driver consumed cannabis, much less that the driver was impaired.

This is especially important when passengers have been using marijuana or when the odor comes from cannabis that was legally possessed.

A defense attorney can examine whether police had sufficient grounds to extend the traffic stop, conduct sobriety testing, make an arrest, or obtain chemical evidence.

How Do Police Test for Marijuana Impairment?

Cannabis DWI investigations can be more complicated than alcohol-related DWI cases.

Alcohol breath testing provides a measurement that can be compared against Minnesota’s statutory alcohol limits. THC testing does not provide the same straightforward legal determination.

Police may rely on field sobriety exercises, drug recognition evaluations, blood testing, urine testing, and their own observations.

However, the presence of THC or cannabis metabolites does not necessarily establish how impaired someone was while driving.

THC detection can be affected by the type of test, the timing of consumption, the frequency of cannabis use, and other factors.

A positive test may be relevant evidence, but it does not automatically prove a cannabis DWI.

An effective defense requires examining the entire investigation rather than treating a laboratory result as conclusive.

What Are the Penalties for Cannabis DWI in Minnesota?

Cannabis DWI charges are prosecuted under Minnesota’s impaired-driving laws, and the consequences can be significant.

Depending on the circumstances, a conviction may involve:

• Criminal fines and possible jail time.
• Probation and court-ordered conditions.
• Chemical dependency evaluations or treatment requirements.
• Driver’s license consequences under applicable law.
• Increased penalties for prior qualifying impaired-driving offenses.
• A criminal record that may affect employment, professional licensing, or other opportunities.

Minnesota DWI offenses range from fourth-degree DWI to first-degree felony DWI, depending on aggravating factors, prior convictions, and other statutory requirements.

A first-time cannabis DWI may be charged as a misdemeanor, but prior offenses or additional aggravating circumstances can increase the severity.

An open-package violation is a separate misdemeanor offense and does not, by itself, establish guilt for DWI.

How Can a Criminal Defense Lawyer Challenge a Marijuana DWI?

Cannabis DWI cases often turn on details that may not be obvious from the police report.

At North Star Criminal Defense, defending a marijuana-related driving charge means examining the legal and factual basis for every stage of the investigation.

Was the traffic stop lawful?

Police must have a legally sufficient reason to stop a vehicle. If the original stop violated constitutional protections, evidence obtained afterward may be subject to challenge.

Did police improperly extend the stop?

An officer cannot automatically transform every routine traffic stop into an unrestricted drug investigation. The circumstances supporting additional questioning, detention, or testing matter.

Was the vehicle search justified?

If police relied primarily on marijuana odor, we examine whether the search complied with Minnesota law and constitutional requirements.

Did the evidence actually establish impairment?

The smell of marijuana, possession of a THC vape, or a positive cannabis test does not necessarily establish impaired driving.

We examine the observations, testing procedures, timelines, and alternative explanations for the evidence.

Were your constitutional rights protected?

Improper searches, unlawful detentions, and other constitutional violations may provide grounds to challenge evidence or seek other appropriate relief.

A cannabis DWI charge is not the same as a cannabis DWI conviction. The evidence and the legality of the investigation deserve careful scrutiny.

Frequently Asked Questions About Marijuana and Driving in Minnesota

Can I drive with marijuana in my car if I’m over 21?

Yes, provided you are legally permitted to possess the cannabis, you are not impaired, and you comply with Minnesota’s transportation and open-package laws. Opened or improperly packaged cannabis should be kept in the trunk or another qualifying area outside the passenger compartment.

Is it illegal to have a weed vape in your cup holder?

A THC vape cartridge that has been opened or partially used can violate Minnesota’s open-package law when kept in a vehicle’s passenger compartment on a street or highway. An unopened, legally compliant product presents a different situation.

Can I smoke weed in my parked car?

Minnesota prohibits cannabis use in a motor vehicle on a street or highway, even if the vehicle is parked. Depending on the circumstances, a person in a parked vehicle may also face a DWI investigation if police believe the person was impaired and in physical control of the vehicle.

Can police search my car if they smell weed?

Not based solely on the odor of cannabis. Minnesota law expressly prohibits using marijuana odor as the sole basis for a vehicle search. Other facts may establish a lawful basis for a search.

Can I get a DWI if my passenger was smoking marijuana?

A passenger’s cannabis use does not automatically make the driver guilty of DWI. However, police may investigate whether the driver was impaired, and the passenger’s consumption may constitute a separate violation.

Can you get a marijuana DWI without smoking that day?

Potentially, but prosecutors must prove the applicable elements of impaired driving. A positive THC test does not automatically establish impairment at the time of driving. The timing of consumption and the remaining evidence can be central to the defense.

Is there a legal THC limit for driving in Minnesota?

Minnesota does not have a numerical THC concentration limit equivalent to the 0.08 alcohol limit for most drivers. Cannabis DWI cases generally require evidence establishing that the person was under the influence.

Can police search my car if they find an open bag of marijuana?

Possibly. An observed open-package violation may provide probable cause to search for additional evidence of that offense. The scope and legality of the search still depend on the circumstances.

Is having marijuana in the glove box the same as keeping it in the trunk?

No. Minnesota’s open-package statute specifically treats the glove compartment as part of the passenger-occupied area. An opened cannabis package generally does not qualify for the trunk exception simply because it is placed in the glove box.

Should I hire a lawyer for a first-time cannabis DWI?

A first-time DWI can carry serious consequences, and marijuana-related cases raise legal and scientific questions that may affect the outcome. An attorney can evaluate the traffic stop, investigation, chemical testing, and available defenses before you decide how to proceed.

Accused of Cannabis DWI in Minnesota? Talk to North Star Criminal Defense.

Marijuana legalization has not eliminated criminal penalties for cannabis-related driving offenses. It has created new distinctions between legal possession, illegal vehicle use, open-package violations, and impaired driving.

Those distinctions can make an enormous difference in a criminal case.

If you were arrested after police smelled marijuana, discovered a THC vape, searched your vehicle, or accused you of driving while impaired by cannabis, you deserve a defense based on the actual evidence and the law.

Contact North Star Criminal Defense to schedule a free consultation about your Minnesota cannabis DWI case.

We can review the circumstances of your arrest, explain the charges, and help you understand your options.