Ignition Interlock Laws by State
Every row below is drawn from the same verified record that powers that state's page: the first-offense interlock rule and minimum period, the repeat-offense period, whether an SR-22 (or FR-44) filing is required and for how long, and the reinstatement fee. Click a state for the statute citation, approved vendors, sources, and the date the record was last checked.
Values are the general rule stated by the statute or licensing agency. Blood-alcohol level, refusals, prior offenses, commercial licensing, and court orders can change what applies in a particular case.
- 22
- IID mandatory for every first offense
- 12
- IID mandatory only above a high-BAC threshold
- 17
- IID at the court's discretion / for a restricted license
- 31
- SR-22 or FR-44 required after any DUI
- 2
- SR-22 only after a repeat offense
- 18
- No SR-22 requirement
"Required" means the statute mandates an interlock for every first offender; "high-BAC only" means it is mandatory only above a stated threshold; "court's discretion" means a court or agency may order it, or it is required only to obtain a restricted license during suspension.
| State | IID, first offense | Min. IID period (first) | Repeat offense | SR-22 | Reinstatement fee | Verified |
|---|---|---|---|---|---|---|
| Alabama | Required only above a high-BAC threshold | 90 days | 2 years | Yes · 3 yr | $275 | August 28 |
| Alaska | Required | 6 months minimum | 12 months minimum | Yes · 5 yr | $200 | August 28 |
| Arizona | Required | 12 months | 12 months for a second § 28-1381 / § 28… | Yes · 3 yr | $50 | August 28 |
| Arkansas | Required | Period equal to the driver's license suspension | Period equal to the driver's license su… | No | $150 | August 28 |
| California | At the court's discretion | Court-ordered | 12 months | Yes · 3 yr | $125 | August 28 |
| Colorado | Required only above a high-BAC threshold | Not mandatory for a first offense under 0.15 BAC | At least 2 years | Yes · 3 yr | $95 reinstatement fee plus… | August 28 |
| Connecticut | Required | 1 year | 3 years | No | $175 | August 28 |
| Delaware | Required | 12 months | 16 months | No | $200 | August 28 |
| District of Columbia | Required | 6 months | 1 year | Yes · 3 yr | $115 | August 28 |
| Florida | Required only above a high-BAC threshold | At least 6 continuous months | At least 1 continuous year | Yes · 3 yr | $75 revocation reinstatemen… | August 28 |
| Georgia | At the court's discretion | No IID is required for a first DUI conviction | 12 months | Yes · 3 yr | $200 by mail / $210 in pers… | August 28 |
| Hawaii | Required | Duration of the revocation period | Duration of the revocation period | Repeat offenses only · 3 yr | $20 | August 28 |
| Idaho | Required | 1 year following the end of the suspension period | 1 year | Yes · 3 yr | $285 | August 28 |
| Illinois | At the court's discretion | Duration of the statutory summary suspension while holding… | Not less than 5 years | Yes · 3 yr | $500 | August 28 |
| Indiana | At the court's discretion | Set by the court | Set by the court | Yes · 3 yr | Shown on the individual's B… | August 28 |
| Iowa | At the court's discretion | For the period of the temporary restricted license | 1 year from the date of reinstatement | Yes · 2 yr | $200 | August 28 |
| Kansas | Required | 180 days | 1 year | Yes · 1 yr | $200 | August 28 |
| Kentucky | At the court's discretion | 4 months minimum | 12 months minimum | No | $40 | August 28 |
| Louisiana | Required | Not less than 6 months during probation | Not less than 6 months from conviction… | Yes · 3 yr | $100 | August 28 |
| Maine | At the court's discretion | Remainder of the 150-day suspension after 30 days served | 2 years | Repeat offenses only · 3 yr | $50 | August 28 |
| Maryland | Required | 6 months | 1 year | No | $150 | August 28 |
| Massachusetts | At the court's discretion | Length of the hardship license period | 2 years | No | $500 | August 28 |
| Michigan | Required only above a high-BAC threshold | High-BAC | Not less than 1 year of documented BAII… | No | $125 | August 28 |
| Minnesota | At the court's discretion | Optional | 2 years | No | $680 | August 28 |
| Mississippi | At the court's discretion | 120 days | 1 year | Yes · 3 yr | $175 | August 28 |
| Missouri | Required only above a high-BAC threshold | 6 months minimum from the date of license reinstatement | 6 months minimum from the date of licen… | Yes · 2 yr | $45 | August 28 |
| Montana | At the court's discretion | Not fixed by statute | During the probationary period, if the… | No | $200 | August 28 |
| Nebraska | Required | 6 months | At least 1 year | Yes · 3 yr | $125 | August 28 |
| Nevada | Required | 185 days | 1 year | Yes · 3 yr | $120 | August 28 |
| New Hampshire | At the court's discretion | At the court's discretion, during any period of sentence re… | Not less than 12 months nor more than 2… | Yes · 3 yr | $100 | August 28 |
| New Jersey | Required | 3 months | During license forfeiture plus not less… | No | $100 | August 28 |
| New Mexico | Required | 1 year | 2 years | No | $102 | August 28 |
| New York | Required | Not less than 12 months | Not less than 12 months | No | $100 | August 28 |
| North Carolina | Required only above a high-BAC threshold | 1 year from the date of restoration | 3 years from restoration if the origina… | Yes · 3 yr | $167.75 | August 28 |
| North Dakota | At the court's discretion | No statutory minimum | No statutory interlock period | Yes · 1 yr | $100 | August 28 |
| Ohio | At the court's discretion | No statutory minimum | Remainder of the period of suspension | No | $315 | August 28 |
| Oklahoma | Required | No less than 180 active ignition-interlock days, with the l… | No less than 365 active ignition-interl… | No | $315 | August 28 |
| Oregon | Required | 1 year after the ending date of the DUII suspension or revo… | 2 years after the ending date of the su… | Yes · 3 yr | $85 | August 28 |
| Pennsylvania | Required only above a high-BAC threshold | 1 year from restoration of the operating privilege | 1 year from restoration of the operatin… | No | $70 | August 28 |
| Rhode Island | Required only above a high-BAC threshold | 3 months to 1 year | 6 months to 2 years | No | $353.50 | August 28 |
| South Carolina | Required | 6 months | 2 years | Yes · 3 yr | $100 | August 28 |
| South Dakota | At the court's discretion | Not fixed by statute | Not fixed by statute | Yes · 3 yr | $100 | August 28 |
| Tennessee | Required | 365 consecutive days or the entire license revocation perio… | 365 consecutive days or the entire lice… | Yes | $103 | August 28 |
| Texas | Required only above a high-BAC threshold | When ordered as a community-supervision condition | Mandatory for repeat offenders | Yes · 2 yr | $100 | August 28 |
| Utah | Required | 18 months | 2 years | No | $85 | August 28 |
| Vermont | At the court's discretion | 90 days | 18 months under an ignition interlock R… | Yes · 3 yr | $96 | August 28 |
| Virginia | At the court's discretion | Not less than 12 consecutive months without alcohol-related… | Not less than 12 consecutive months wit… | Yes · 3 yr | $220 | August 28 |
| Washington | Required | 1 year | 5 years for a second restriction | Yes · 3 yr | $170 | August 28 |
| West Virginia | Required only above a high-BAC threshold | 125 days minimum | 2 years minimum | No | $50 | August 28 |
| Wisconsin | Required only above a high-BAC threshold | 1 year minimum | 1 year minimum, up to the maximum revoc… | Yes · 3 yr | $200 | August 28 |
| Wyoming | Required only above a high-BAC threshold | 6 months | 1 year | Yes · 3 yr | $50 | August 28 |
Hover a shortened cell for the full text; the state page has the complete rule, its citation, and sources.
Related: SR-22 requirements after a DUI by state · what an interlock costs