Can You Get a Marijuana DUI in Indiana Weeks After Smoking Weed?

Yes. In Indiana, you can face marijuana DUI charges even if you smoked weed days or weeks before driving. Indiana law prohibits operating a vehicle with certain controlled substances or their metabolites in your blood. You do not necessarily have to be high at the time.

That means a weekend trip to a state where marijuana is legal could create criminal problems after you return to Indiana. You might feel completely sober, drive perfectly normally, and still find yourself facing charges after a blood test.

The problem isn’t necessarily what marijuana is doing to your body. It’s what marijuana has left behind.

Why Can Indiana Charge You With a DUI If You’re Not High?

Indiana uses the term operating a vehicle while intoxicated, or OVWI. Most people simply call it a DUI. For practical purposes, we’re talking about the same family of criminal offenses.

Under Indiana Code § 9-30-5-1, operating a vehicle with a Schedule I or II controlled substance, or its metabolite, in your blood can be a Class C misdemeanor.

Unlike an ordinary intoxication charge, this offense does not necessarily require proof that your driving was impaired.

Think about that for a moment.

You could smoke marijuana legally while vacationing in Colorado, return to Indianapolis, and get pulled over weeks later. A blood test showing a prohibited substance or metabolite could still create criminal exposure.

There are statutory exceptions and defenses, so a positive blood test does not automatically establish guilt. Nevertheless, Indiana’s approach creates a serious risk for drivers who consumed marijuana long before getting behind the wheel.

How Long Can Marijuana Stay in Your Blood After You Stop Smoking?

Marijuana affects the body in different ways, and understanding the difference between THC and its metabolites is essential.

THC is the primary psychoactive component of marijuana. It’s the chemical responsible for making someone feel high.

THC-COOH, sometimes called THC carboxy, is an inactive metabolite. It’s produced when your body processes THC.

Here’s the important distinction:

• Active THC: May remain detectable in blood for hours or longer, depending on usage and testing conditions.
• THC-COOH: Can remain detectable after the intoxicating effects have disappeared.
• Detection periods: Vary based on frequency of use, dosage, metabolism, and the type of test performed.

Frequent marijuana users may retain detectable metabolites considerably longer than occasional users. 

Indiana’s controlled-substance driving law specifically includes metabolites. That means the absence of a current high does not necessarily eliminate the possibility of prosecution.

Is There a Legal THC Limit for Driving in Indiana?

Indiana does not use a numerical THC threshold comparable to the familiar 0.08 alcohol limit.

For alcohol, Indiana law establishes specific alcohol concentration thresholds. Marijuana is treated differently.

Under Indiana Code § 9-30-5-1, the controlled-substance offense can apply when a prohibited substance or metabolite is present in the driver’s blood.

In other words, Indiana does not require prosecutors to establish a particular minimum THC concentration for this offense.

That doesn’t mean every positive result guarantees a conviction. The prosecution must still prove the required elements, and statutory defenses may apply.

But there’s no reason to assume you’re legally safe simply because you no longer feel marijuana’s effects.

What Signs Make Indiana Police Suspect Marijuana Impairment?

Police officers don’t need to catch someone actively smoking marijuana to investigate a possible DUI.

During a traffic stop, officers look for physical and behavioral indicators that might suggest impairment.

Common observations include:

• Red or bloodshot eyes.
• Slurred or unusually slow speech.
• Difficulty retrieving a driver’s license or registration.
• Fumbling with a wallet, purse, or glove compartment.
• Trouble answering questions while performing another task.
• Unusual coordination or balance problems.

Officers may also use field sobriety testing to investigate suspected impairment.

Consider something as ordinary as reaching for your registration.

While you’re searching through the glove compartment, an officer might ask where you’re coming from. They’re watching whether you can handle both tasks simultaneously.

Difficulty multitasking can become part of the officer’s observations.

Of course, nervousness isn’t intoxication. Neither are tired eyes or clumsy fingers.

An officer’s observations must be evaluated in context, particularly when the suspected substance is marijuana.

Can You Face Felony Charges After an Accident If You Smoked Weed Weeks Earlier?

Yes, a serious accident can create additional criminal exposure when marijuana or its metabolites appear in blood testing.

Imagine returning from a vacation where you legally consumed marijuana.

Three weeks later, you’re involved in a serious collision in Indiana. Someone suffers severe injuries or dies.

Under Indiana Code Chapter 9-30-7, officers have special chemical-testing procedures for accidents involving serious bodily injury or death.

These investigations can involve blood testing even when the circumstances differ from an ordinary traffic stop.

If the results reveal a prohibited controlled substance or metabolite, prosecutors may consider additional charges.

The potential consequences are substantial. Certain serious-injury or fatality offenses carry serious felony penalties.

However, a positive marijuana result does not automatically prove criminal responsibility for the accident. The specific charge, statutory elements, and circumstances remain critical.

A fatal accident and a positive drug test are serious facts. They are not substitutes for proving a criminal offense.

Should You Refuse a Blood Test During an Indiana Marijuana DUI Investigation?

Generally, refusing a lawfully requested certified chemical test creates additional legal problems.

Indiana operates under an implied consent system.

Under Indiana Code § 9-30-6-1, people who operate vehicles in Indiana are subject to the state’s chemical-testing requirements.

This applies to visitors as well as Indiana residents.

Refusing a qualifying chemical test can result in substantial license consequences:

• One-year suspension: Generally applies when the driver has no qualifying prior DUI / OVWI conviction.
• Two-year suspension: Generally applies when the driver has a qualifying prior DUI / OVWI conviction.

These penalties are addressed in Indiana Code § 9-30-6-9.

Refusal also doesn’t guarantee that police will abandon testing. Officers may seek a warrant authorizing a blood draw.

The better approach is to understand your rights before you’re confronted with this decision.

What Should You Do If You’re Charged With a Marijuana DUI in Indiana?

A marijuana-related DUI / OVWI charge deserves careful attention, particularly when the alleged consumption occurred long before driving.

An Indiana criminal defense attorney can examine several important questions:

1. Did the officer have a lawful basis for the traffic stop and investigation?
2. Was the chemical test properly requested and administered?
3. What substance or metabolite did the blood test actually identify?
4. Were the samples properly collected, preserved, and analyzed?
5. Does a statutory exception or defense apply?
6. Can the prosecution prove every element of the charged offense?

A positive drug test may be important evidence, but it isn’t the entire case.

Remember, you have the right to remain silent. You can cooperate with lawful testing requirements without volunteering statements about your marijuana use.

If you’re facing marijuana DUI or OVWI charges in Indianapolis or elsewhere in Indiana, contact the Marc Lopez Law Firm at 463-283-7387 to speak with a criminal defense lawyer today.

And remember—always plead the 5th.