Montana DUI Guide

Montana DUI Defenses: Dismissal, Reduction, and Trial

No honest lawyer promises to beat a DUI. But these cases are built from a stop, a set of tests, and a machine, and each of those can be checked.

Written by

Misty Gaubatz, Partner, A&M Law

Licensed Montana attorney and co-founder of A&M Law. Over two decades in the practice of law focusing on family law, criminal defense, and DUI defense, with federal and state court experience and a Certificate in Mediation.

Montana Bar #122346+ years as an attorney, with over two decades working in the lawReviewed by Ashley HurlbertLast reviewed: October 1, 2026

Key Takeaways: Montana DUI Defenses: Dismissal, Reduction, and Trial

A DUI charge can end in a dismissal, an acquittal, a plea to a different offense, or a conviction. Which one depends on the evidence.
The stop must rest on particularized suspicion (MCA § 46-5-401). Evidence from an unlawful stop can be suppressed (MCA § 46-13-302).
A breath result is admissible only if the test was given by a certified operator, and instruments must be field certified at least every 31 days (MCA § 61-8-1018; ARM 23.4.213).
For a drug-based impairment charge, a positive test is not enough by itself (MCA § 61-8-1018(1)(a)).
There is no "wet reckless" in Montana. A reduction means a plea to a different existing offense, such as reckless driving.
A DUI cannot be deferred, so the charge itself has to be confronted (MCA §§ 46-16-130(4), 61-8-1011(4)).

A DUI charge feels final when you are holding the citation. It is not. It is an accusation the State has to prove, with evidence that was gathered by people following procedures, and both the people and the procedures can be examined. This page describes where Montana DUI cases are actually contested and what the realistic outcomes are. It is part of our Montana DUI Guide.

What the State Has to Prove

Under MCA § 61-8-1002 the State must prove that you drove or were in actual physical control of a vehicle, in a place the statute covers, and either that you were under the influence, meaning your ability to safely operate a vehicle was diminished, or that a test showed a prohibited level. Every defense is aimed at one of those elements or at whether the evidence for it was lawfully and reliably obtained.

1. The Stop

An officer needs particularized suspicion that an offense has been, is being, or is about to be committed (MCA § 46-5-401), and a stop may last no longer than necessary for its purpose (MCA § 46-5-403). We compare the report to the dash and body camera video: what the officer says they saw, and what the video shows. If the stop or its extension was unlawful, a motion to suppress can remove everything that followed (MCA § 46-13-302). See stops, roadblocks, and open containers.

2. The Roadside Investigation

The standardized field sobriety tests have specific instructions and scoring. An attorney trained in the same protocol checks whether the tests were given the way the officer was taught, on a suitable surface, to a person without an injury or condition that affects the result. A report of such an assessment is admissible only if it was made by a person with training the Department of Justice provides or recognizes (MCA § 61-8-1018(1)(c)).

The handheld roadside breath test is a screening device. Under the administrative rules its results are recorded only as positive or negative (ARM 23.4.225).

3. The Breath Test

The operator. A breath test report is admissible if the test was performed by a person certified by the Forensic Science Division to administer it (MCA § 61-8-1018(1)(b)).
The instrument. Breath instruments must be field certified for accuracy at least once every 31 days, and a field certification is valid when results are within plus or minus 10% of the target value (ARM 23.4.213). The maintenance and certification records are obtainable and worth reading.
The timing. The statutory inferences depend on a sample taken within a reasonable time after the driving (MCA § 61-8-1002(2)).
Your records. On request, full information about any test given at an officer's direction must be made available to you or your attorney (MCA § 61-8-1019(3)).

4. The Blood Test

Blood may be drawn for the State only by a licensed physician, registered nurse, or other qualified person acting under their supervision (MCA § 61-8-1019(1)), and it must be analyzed by a laboratory operated or certified by the Department of Justice or one exempt from certification (MCA § 61-8-1018(1)(b)). The rules require the skin to be cleaned with a non-alcohol antiseptic (ARM 23.4.220). A defense looks at who drew the sample, how it was sealed and stored, the chain of custody, and what the laboratory actually measured. For THC and other drugs, see THC DUI and prescription and drug DUI.

5. Were You Driving, and Was It a Vehicle?

If you were found parked, asleep, or outside the vehicle, the State must prove actual physical control, which Montana courts decide on the totality of the circumstances. And some things are not vehicles for DUI purposes at all. See actual physical control and horses, bikes, ATVs, and boats.

6. Is It the Right Charge?

The penalty depends on the exact subsection and the number of priors. We check whether the evidence supports an impairment charge, a per se charge, or an aggravated one, and whether each prior actually counts under the 10-year and lifetime rules in MCA § 61-8-1011. Correcting a miscounted prior can change a second offense to a first, or a felony to a misdemeanor.

7. Procedure

After a plea on a misdemeanor charge, the case must be dismissed if it is not brought to trial within 6 months, unless the defendant postponed the trial or the State shows good cause (MCA § 46-13-401(2)). The statements you made, and whether they were voluntary, can also be challenged (MCA § 46-13-301).

What "Reduced" Means in Montana

Two rules frame every negotiation. A DUI prosecution may not be deferred (MCA § 46-16-130(4)), and a DUI sentence may not be deferred (MCA § 61-8-1011(4)). So there is no diversion program that makes a DUI charge disappear after good behavior.

What Montana law does allow is a plea agreement to "a lesser or related offense" (MCA § 46-12-211). In practice that can mean reckless driving (MCA § 61-8-301) or another traffic offense. Reckless driving carries up to 90 days in jail and a fine of $100 to $500 on a first conviction, and 5 points, but it is not a DUI conviction and it is not listed as a DUI prior. Montana has no special "wet reckless" charge. Whether a prosecutor will agree to an amendment depends on the strength of the evidence, which is why the review in the sections above comes first.

Honest Expectations

Many DUI cases have solid evidence, and in those the work is to get the best available sentence, protect the license as far as the law allows, and avoid mistakes that make things worse. Some cases have a real problem in the stop, the testing, or the charge. You cannot tell which kind you have from the citation. You can tell from the video and the records, and getting those is the first step. Our page on the DUI court process shows where each of these challenges happens.

This page explains Montana law in general as of the 2025 Montana Code Annotated and the Administrative Rules of Montana. Every case turns on its own facts, and past results do not predict future outcomes. It is not legal advice about your specific case.

Montana DUI Guide DUI Defense DUI vs. DWI: Montana Terms & Limits Sleeping in Your Car: Actual Physical Control DUI on a Horse, Bike, ATV, or Boat Checkpoints & Open Containers

FAQ

Montana DUI Defenses: Dismissal, Reduction, and Trial FAQ

Can a DUI be dismissed in Montana?

Yes, in some cases. Dismissals happen when key evidence is suppressed, when the State cannot prove an element such as driving or actual physical control, when test results are inadmissible or unreliable, or when a speedy trial deadline is missed. Whether any of that applies depends entirely on the facts. No lawyer can promise a dismissal.

Can a DUI be reduced to reckless driving in Montana?

It can happen by agreement with the prosecutor, because Montana law allows plea agreements to a lesser or related offense (MCA § 46-12-211) and we found no statute barring one in a DUI case. It is not automatic and prosecutors do not offer it in every case. Reckless driving is a real offense with its own penalties: up to 90 days in jail and a $100 to $500 fine for a first conviction, and 5 points (MCA §§ 61-8-715, 61-11-203).

What is a wet reckless in Montana?

It is not a Montana offense. Some states have a special alcohol-related reckless driving charge that counts as a prior DUI. Montana's reckless driving statute has no alcohol version, and reckless driving is not on the list of convictions that count as DUI priors in MCA § 61-8-1011.

Can I beat a DUI if I blew over 0.08?

A result of 0.08 or more is strong evidence but not the end of the analysis. The questions are whether the stop and arrest were lawful, whether the operator was certified, whether the instrument was within its certification period, and whether the result reflects your alcohol concentration at the time of driving. For an impairment charge, the inference from 0.08 is rebuttable (MCA § 61-8-1002(2)).

Does refusing the test make the case easier to win?

Not reliably. Without a number the State must prove impairment by other evidence, but the refusal itself is admissible and the jury may infer from it that you were under the influence (MCA § 61-8-1018(2)). A refusal also brings its own license suspension with no probationary license. See our test refusal page.

Can I get my own blood test?

Yes. In addition to any test given at an officer's direction, a person may request an independent blood sample drawn by a physician or registered nurse. The officer may not unreasonably impede that right but has no duty to transport you, and you pay for the test (MCA § 61-8-1019(2)).

Want Someone to Look at the Evidence?

The video and the testing records usually answer the question. Call 406-830-3060 for a confidential consultation.

Call 406-830-3060 Send a Message