If you are not a U.S. citizen, a Montana DUI has two layers. The criminal case is decided in a Montana court under Montana law. What that case means for a visa, a green card, DACA, or a citizenship application is decided by federal agencies under federal immigration law, and the answer depends on your status and on the exact outcome of the case. This page explains the Montana side and collects a few published federal points to show why early immigration advice matters. It is part of our Montana DUI Guide.
Please read this next sentence carefully. A&M Law defends DUI charges. We do not practice immigration law, and nothing here is immigration advice. You need an immigration lawyer to tell you how any of this applies to you.
What Montana Courts and Defense Lawyers Must Do
Montana law builds in one warning. Before accepting a plea of guilty or no contest, the court must determine that the defendant understands that, for a person who is not a United States citizen, the plea "might result in deportation from or exclusion from admission to the United States or denial of naturalization under federal law" (MCA § 46-12-210(1)(f)). The court can cover this with a written acknowledgment that you sign (MCA § 46-12-210(2)).
That warning is general. It tells you a risk may exist, not whether it exists for you. The U.S. Supreme Court has also held that a criminal defense lawyer must inform a client whether a plea carries a risk of deportation, and that when the immigration law is not clear the lawyer must at least advise that the charge may carry adverse immigration consequences (Padilla v. Kentucky, No. 08-651, decided March 31, 2010). In practice that means your defense lawyer needs to know your status on day one.
Published Federal Points That Show the Range
The table below is not a complete list and is not a prediction for any person. It shows how differently a DUI is treated depending on who you are and what the conviction is.
| Topic | What the source says | Source |
|---|---|---|
| Visa holders | A visa may be revoked based on a DUI arrest or conviction within the previous five years. No conviction is required. | State Department, 9 FAM 403.11-5(B) |
| Naturalization applicants | Two or more DUI convictions in the statutory period create a rebuttable presumption that the applicant lacks good moral character. | USCIS Policy Manual, Vol. 12, Part F, Ch. 5 |
| DACA requestors | A single misdemeanor DUI conviction is listed as disqualifying, regardless of the sentence imposed. | 8 CFR 236.22(b)(6) |
| Crime involving moral turpitude | The Board of Immigration Appeals has said a simple DUI ordinarily is not one, but held that an aggravated DUI requiring knowledge that driving was prohibited is. | Matter of Lopez-Meza, 22 I&N Dec. 1188 (BIA 1999) |
| Crime of violence | A DUI statute that requires no mental state, or only negligence, is not a crime of violence under 18 U.S.C. 16. | Leocal v. Ashcroft, 543 U.S. 1 (2004) |
Two cautions about the last rows. The Supreme Court's decision in Leocal is narrow. It does not say a DUI has no immigration consequences. And the Board's decision in Lopez-Meza concerned an Arizona statute. How Montana's offenses compare is a question for an immigration lawyer.
Why the Exact Montana Charge Matters
Montana has several ways to charge a DUI, and they are not the same for immigration purposes.
- Simple alcohol DUI. The impairment offense and the 0.08 per se offense carry absolute liability, meaning no mental state has to be proved (MCA § 61-8-1002(5)).
- Aggravated DUI. Montana's definition includes a DUI committed while the license is suspended or revoked for a prior DUI, among other triggers (MCA § 61-8-1001(1)). Because the Board has treated an aggravated offense differently from a simple one, an aggravated DUI charge needs immigration review.
- THC and drug DUIs. Montana has per se limits for THC and for listed drugs (MCA § 61-8-1002(1)(d) to (f)). Federal immigration law has its own grounds for offenses relating to a controlled substance (8 U.S.C. 1182(a)(2)(A)(i)). See our THC DUI page for the Montana side.
- A second DUI. A second conviction changes the naturalization analysis described above, apart from the higher Montana penalties.
A person may be convicted of only one offense under the DUI statute for one incident (MCA § 61-8-1002(6)), so which subsection a plea names is a real choice. It should be made with both lawyers involved. Our pages on plea agreements and pleading guilty or not guilty explain the Montana process.
No Deferred Sentence for a Montana DUI
In some kinds of cases a deferred sentence is part of the discussion. It is not available here. A Montana court may not defer imposition of sentence for a DUI (MCA § 61-8-1011(4)). Federal immigration law also uses its own definition of "conviction," which does not always match a state's. Both points are reasons the outcome should be reviewed by an immigration lawyer before it is final, not after.
Travel, Renewals, and Pending Applications
A pending charge can matter before any conviction. Visa guidance reaches arrests, and U.S. Customs and Border Protection lists pending criminal charges, including DUI, among the reasons a person may not be eligible for Global Entry. If you have international travel planned, a renewal coming up, or an application on file, tell your immigration lawyer about the arrest before you travel or file anything. Our page on international travel after a DUI covers travel generally, and Canadian citizens should see our page for Canadians arrested in Montana.
What to Do Now
- Tell your defense lawyer your exact status and any pending applications.
- Consult an immigration lawyer before any plea, including a plea to a reduced charge.
- Keep every court date. A missed appearance can lead to a warrant and a second problem.
- Gather your immigration documents and any prior court records, from any state or country.
For other consequences outside court, see our page on jobs, licenses, gun rights, and custody.
This page explains Montana law in general as of the 2025 Montana Code Annotated and summarizes published federal sources as of October 2026. Immigration rules change often. It is not immigration advice and is not legal advice about your specific case.