Was this your first DUI, and do you need your car for work? Learn if an interlock is coming.
Ignition Interlock Requirements After a DUI, by State
Learn which group your state is in: 26 jurisdictions require the device for every offender, 12 only at a high blood alcohol level and 13 not for every first offense. Then choose your state in the free tool below to see its rule, the period the statute sets and your license hearing window, which runs on its own deadline.
Quick answer
26 jurisdictions require an ignition interlock for every DUI offender, first offense included (for 17 of them the count rests on NCSL's March 2024 table and GHSA's October 2025 state pages agreeing, not on statute text read for this site), 12 require it on a first offense only at a high blood alcohol level, and 13 do not require it for every first offense, 4 of those only for a restricted license or early reinstatement. Where the statute was read, Nevada orders 185 days for a first violation within 7 years (NRS 484C.460), South Carolina six months (S.C. Code 56-5-2990), and Connecticut a year of interlock-only driving after a 45-day suspension (C.G.S. 14-227a). Mississippi's driver services page prices it at $175 when the interlock-restricted license is issued, plus $56 for the license. Checked on October 14, 2026.
Free tool
Choose your state and your arrest date to learn how many days you have to request the license hearing, the date that window ends, and the first-offense fine, jail, suspension and interlock rules your state records, each with its source.
By the Legal Cost by State Editorial Team·Last updated and source-checked October 14, 2026
What to do next
1
Find your BAC on the citation or the test report
In 12 states the first-offense interlock rule turns on that number, at a level the statute sets above the per-se limit.
2
Choose your state in the free lookup
It shows you the interlock rule on a first offense and the period the statute sets, with the license suspension and your hearing window beside it.
3
Read the agency page linked for the price
The one price quoted on this page is from Mississippi's agency page; no vendor lease or installation price is published here, so the vendor and the agency are the only places you can get it.
Which states require an interlock on a first offense?
The group comes from the statute for 18 jurisdictions, the agency page for Tennessee, and the NCSL and GHSA tables agreeing for the other 32 (both marked secondary in the Sources list).
First-offense rule
Jurisdictions
Count
Required for all offenders
Alaska, Arizona, Arkansas, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Illinois, Kansas, Kentucky, Louisiana, Maryland, Mississippi, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, Oklahoma, Oregon, South Carolina, Tennessee, Utah and Washington
26
Required only at a high BAC
Alabama, Colorado, Florida, Michigan, Minnesota, North Carolina, Pennsylvania, Rhode Island, Texas, West Virginia, Wisconsin and Wyoming
12
Only for a restricted license or early reinstatement
Iowa, Maine, Vermont and Virginia
4
No all-offender mandate (NCSL and GHSA)
California, Georgia, Indiana, Massachusetts, Missouri, Montana, North Dakota, Ohio and South Dakota
9
Of the 26 all-offender jurisdictions, 17 rest only on NCSL and GHSA agreeing. "Only for a restricted license or early reinstatement" means a person who serves the whole suspension gets the license back without a device. "No all-offender mandate" does not rule out a court-ordered interlock or one tied to a restricted license.
Learn the interlock period the statutes set for a first offense.
The statute or the license condition sets the period:
Alaska
The court requires an interlock for at least six months after the person regains the privilege to drive, including any limited privilege, on a first conviction, and 12 months on a second (AS 28.35.030).
Connecticut
A first offense brings a 45-day suspension followed by one year in which the person may drive only a vehicle with an interlock (C.G.S. 14-227a).
Hawaii
The first-offense sentence includes installing an interlock on every vehicle the person drives for the revocation period, which runs 1 year to 18 months (HRS 291E-61).
Nevada
The court orders the person to install an interlock, at his or her own expense, in any vehicle the person operates, as the condition of the interlock privilege that reinstates driving: 185 days on a conviction for a first violation within 7 years (NRS 484C.460(1)), with exceptions in subsections 2 and 5.
South Carolina
For a first offense the person enrolls in the Ignition Interlock Device Program and obtains an interlock-restricted license, and the device stays on for six months (S.C. Code 56-5-2990(A)(2), as amended by 2023 Act No. 55, in effect since May 19, 2024).
Learn where an interlock can get you a restricted license or a shorter suspension.
In Iowa, Maine, Vermont and Virginia the statute requires the interlock on a first offense only if the person drives during the suspension on a restricted license or seeks early reinstatement. Vermont lets an eligible person drive under an ignition interlock restricted driver's license or certificate during the suspension (23 V.S.A. 1205), and Virginia lets a person petition the general district court for a restricted license with an interlock (Va. Code 46.2-391.2).
Elsewhere the interlock is tied to a shorter suspension. Kentucky shortens a first-offense suspension from six months to four for a person issued an ignition interlock license who meets its 90-consecutive-day requirement (KRS 189A.070). Louisiana grants a restricted license on proof of a functioning interlock when the test was under 0.15, and a hardship license with the interlock installed for the whole two-year suspension at 0.15 or more (La. R.S. 32:667). Utah lets a person suspended for an alcohol-related offense petition to become an ignition interlock restricted driver (Utah Code 53-3-223), and Mississippi suspends for 120 days on conviction unless the court orders an interlock-restricted license.
Learn which states' first-offense rule turns on a high blood alcohol level.
Alabama, Colorado, Florida, Michigan, Minnesota, North Carolina, Pennsylvania, Rhode Island, Texas, West Virginia, Wisconsin and Wyoming require an interlock on a first offense only at a blood alcohol level that the statute sets above the 0.08 per-se limit; in Alabama, Colorado, Florida, Rhode Island, Texas and West Virginia the statute puts that level at 0.15 or more. Below it, the interlock may still come with a restricted license or a court order, depending on the statute.
Learn the one published interlock price and what it leaves out.
Private vendors supply the device, and no lease, installation or calibration price is recorded for any state. The one public price is Mississippi's: its Driver Service Bureau lists a $175 ignition-interlock fee when the interlock-restricted license is issued and $56 for the license itself.
Device fees are separate from the fine, court costs and the license reinstatement fee; the cost guide collects the charges the statutes and agencies publish.
Learn how the groups were checked against the statutes and which text controls.
The interlock column was reconciled with current statutes on October 14, 2026; the other 32 rows keep the NCSL and GHSA group where the two agree, both marked secondary in the Sources list. Colorado's cell rests on the 2024 edition of its statutes, and Iowa's on Internet Archive copies of the official code PDFs, because the state site did not load. A legislature can change its interlock law in any session, so the statute linked in the state chart is the controlling text.
Every group was checked on October 14, 2026, and the next full review of the DUI dataset is due April 14, 2027.
26 jurisdictions require one for every offender: Alaska, Arizona, Arkansas, Connecticut, Delaware, District of Columbia, Hawaii, Idaho, Illinois, Kansas, Kentucky, Louisiana, Maryland, Mississippi, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, Oklahoma, Oregon, South Carolina, Tennessee, Utah and Washington. For 17 of them (Alaska, Arkansas, District of Columbia, Hawaii, Idaho, Illinois, Kentucky, Louisiana, Maryland, Mississippi, Nebraska, New Hampshire, New Jersey, New Mexico, New York, Oregon and Washington) the group rests on NCSL and GHSA agreeing, not on statute text read for this site.
It depends on your state's statute: six months in Alaska and South Carolina, 185 days in Nevada, a year after a 45-day suspension in Connecticut, and the whole 1-year to 18-month revocation in Hawaii.
NCSL's table and GHSA's state pages both leave California out of the all-offender group, so its cell reads "Not required for every first offense". The California statute was not read for this cell, and a court may still order a device.
In some states: Kentucky cuts a first-offense suspension from six months to four for an interlock-license holder who meets the 90-day requirement (KRS 189A.070), and Louisiana grants a restricted license on proof of an interlock when the test was under 0.15 (La. R.S. 32:667).
Mississippi lists $175 when the interlock-restricted license is issued, plus $56 for the license; no vendor price is recorded for any state.
In Alabama, Colorado, Florida, Michigan, Minnesota, North Carolina, Pennsylvania, Rhode Island, Texas, West Virginia, Wisconsin and Wyoming, the first-offense interlock requirement applies only at a blood alcohol level the statute sets higher than 0.08; the cells for Alabama, Colorado, Florida, Rhode Island, Texas and West Virginia say 0.15 or more.
That the state has no all-offender mandate. In Iowa, Maine, Vermont and Virginia the statute requires the device only for a restricted license or early reinstatement; in California, Georgia, Indiana, Massachusetts, Missouri, Montana, North Dakota, Ohio and South Dakota NCSL and GHSA agree there is no all-offender mandate. A court may still order an interlock in many of these states.
From the statute text for 18 jurisdictions, Tennessee's agency page, and the NCSL and GHSA tables where the two agree for the other 32. Checked on October 14, 2026.
Information on this page reflects laws and published figures as of October 14, 2026. This is general information, not legal advice, and not a prediction for any matter. Rules and fees change; check the court or agency page linked for each figure.
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