A new DUI arrest while you are on probation or parole starts two proceedings at once. One is the new DUI charge, handled like any other criminal case. The other is a revocation of the earlier sentence or release, where the question is whether you broke a condition of supervision. They are decided by different people under different standards, and the revocation can move faster. This page explains how the two work in Montana. It is part of our Montana DUI Guide.
Two Proceedings Compared
| Question | The new DUI charge | The revocation |
|---|---|---|
| What it decides | Whether you committed a new DUI | Whether you violated a condition of the earlier sentence or release |
| Who decides | The court where the new charge is filed, with a right to a jury | Probation: the sentencing judge. Parole: a hearing panel of the Board of Pardons and Parole |
| Standard of proof | Beyond a reasonable doubt | Probation: a preponderance of the evidence (MCA § 46-18-203(7)(a)) |
| What is at stake | The DUI penalties for a first, second, third, or later offense | The suspended or deferred time on the old sentence, or a return to custody on parole |
| Release while it is pending | The ordinary bail rules | A probation and parole officer can authorize a 72-hour hold without bail |
The Arrest and the 72-Hour Hold
Supervision changes what happens in the first days. If a probation and parole officer reasonably believes a probationer has violated a condition, a court may issue a warrant, or the officer may arrest without one (MCA § 46-23-1012(1) and (2)). The officer may then authorize a detention center to hold the probationer without bail for 72 hours. Within those 72 hours the officer must do one of three things: authorize release, hold an intervention hearing, or arrange for the probationer to appear before a magistrate to set bail (MCA § 46-23-1012(3)).
For a person on parole the first steps are similar, including the 72-hour hold (MCA § 46-23-1023(4)). One difference matters: the ordinary bail statutes do not apply to a parolee who is ordered held under the parole hearing statute (MCA § 46-23-1024(6)).
The new DUI has its own release decision under the ordinary rules. For a second or aggravated DUI a court can make the 24/7 Sobriety Program a condition of release (MCA § 44-4-1205(2)(a)). Our page on bail and release conditions explains that side.
Why a New Offense Is Treated Differently
Montana's supervision statutes separate "compliance violations" from everything else. A compliance violation is a violation of supervision conditions that is not, among other things, a new criminal offense or absconding (MCA § 46-18-203(11)(b)). The statutes steer compliance violations toward graduated responses, such as intervention hearings and short sanctions, before revocation.
A new DUI is alleged as a new criminal offense, so it falls outside that category. For a parolee, when a hearing panel finds a violation that is not a compliance violation, it may continue the parole, continue it with added conditions including a placement of up to 9 months, or revoke it (MCA § 46-23-1025(3)). Our page on probation violations covers the more common, lesser violations.
The Probation Revocation Hearing
A revocation of a suspended or deferred sentence starts with a petition showing probable cause that a condition was violated. It must be filed during the suspended or deferred period, although the period running out after filing does not end the court's authority (MCA § 46-18-203(1) and (2)). The person has these protections under MCA § 46-18-203(5):
- to be brought before the judge without unnecessary delay, and no more than 60 days after arrest;
- to be told the allegations at least 10 days before the hearing;
- to appear, present evidence, and question adverse witnesses; and
- to be represented by counsel.
At the hearing the prosecution must prove a violation by a preponderance of the evidence (MCA § 46-18-203(7)(a)). If it does not, the petition must be dismissed (MCA § 46-18-203(9)). If the judge finds a violation, the options are to continue the sentence unchanged, continue it with modified or added conditions, or revoke it and require the person to serve the sentence imposed or any sentence that could have been imposed without a longer term than the original (MCA § 46-18-203(8)(a)). If the earlier sentence was deferred, the judge may impose any sentence that could have been imposed originally.
On revocation the judge must consider elapsed time on supervision and credit the time served without violations, and may deny credit for a reasonable period related to a violation, stating the reasons (MCA § 46-18-203(8)(b)).
How the Two Cases Affect Each Other
Because the revocation needs a lower level of proof and no jury, it does not have to wait for the DUI case to finish. That creates a real tension. What you say at a revocation hearing, to a probation officer, or in an admission to the violation may not be protected from use in the new DUI prosecution. Decisions about whether to admit a violation, contest it, or ask the court to hold the revocation until the DUI is resolved should be made with a lawyer who is looking at both files.
Sentences stack by default. Unless the judge orders otherwise, the time left on a suspended sentence or probation is not merged into a new sentence, and separate sentences run consecutively (MCA § 46-18-401(1)(b) and (4)).
When the Earlier Case Was Also a DUI
Many people on supervision for a DUI are serving a suspended jail term. The DUI penalty statute says that if a person violates any condition of the suspended sentence or any treatment requirement, the court may impose the remainder of the jail term that was suspended (MCA § 61-8-1007(1)(e)(iii)). A person on felony DUI probation is under conditions that include no alcohol and no driving unless a probation officer authorizes it (MCA § 61-8-1008(1)(b)(iv)).
The new charge is also likely to be more serious than the first:
- Offense number. A prior conviction within 10 years makes the new case a second offense, and every prior counts toward a third. A fourth is generally a felony. See our pages on second and third DUI and felony DUI.
- Aggravated DUI. A DUI committed while the license is suspended for a prior DUI, or while under a court or department order to use an ignition interlock, meets the definition of aggravated DUI (MCA § 61-8-1001(1)(b) and (c)). See our aggravated DUI page.
- A first case that is still open. Since October 1, 2025, a pending offense counts as a prior if it results in a conviction before sentencing on the present one (MCA § 61-8-1011(1)(a)(iii)). See our page on a second DUI while the first is pending.
What to Do First
Your conditions of supervision may require you to report the arrest. Talk with a lawyer right away about what to say beyond that, and do not miss a report date while you wait. Gather the judgment from the earlier case, your conditions of supervision, and everything you were handed at the new arrest. If you refused a test, a separate 30-day license deadline may be running under MCA § 61-8-1017.
This page explains Montana law in general as of the 2025 Montana Code Annotated. It is not legal advice about your specific case.