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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.

Seen a different count elsewhere? MADD, NCSL and GHSA publish 34, 31 and 27. Why the numbers differ, state by state.

First-offense interlock rule, mapped

Colored from the same registry as the table below. Hover for the rule; click a state for its page and the statute it cites.

First-offense ignition interlock rule by stateAlabama: Mandatory only above a high-BAC thresholdALAlaska: Mandatory after any first offenseAKArizona: Mandatory after any first offenseAZColorado: Mandatory only above a high-BAC thresholdCOFlorida: Mandatory only above a high-BAC thresholdFLGeorgia: Court's discretion or restricted-license conditionGAIndiana: Court's discretion or restricted-license conditionINKansas: Mandatory after any first offenseKSMaine: Court's discretion or restricted-license conditionMEMassachusetts: Court's discretion or restricted-license conditionMinnesota: Court's discretion or restricted-license conditionMNNew Jersey: Mandatory after any first offenseNorth Carolina: Mandatory only above a high-BAC thresholdNCNorth Dakota: Court's discretion or restricted-license conditionNDOklahoma: Mandatory after any first offenseOKPennsylvania: Mandatory only above a high-BAC thresholdPASouth Dakota: Court's discretion or restricted-license conditionSDTexas: Mandatory only above a high-BAC thresholdTXWyoming: Mandatory only above a high-BAC thresholdWYConnecticut: Mandatory after any first offenseMissouri: Mandatory only above a high-BAC thresholdMOWest Virginia: Mandatory only above a high-BAC thresholdWVIllinois: Court's discretion or restricted-license conditionILNew Mexico: Mandatory after any first offenseNMArkansas: Mandatory after any first offenseARCalifornia: Court's discretion or restricted-license conditionCADelaware: Mandatory after any first offenseDistrict of Columbia: Mandatory after any first offenseHawaii: Mandatory after any first offenseHIIowa: Court's discretion or restricted-license conditionIAKentucky: Court's discretion or restricted-license conditionKYMaryland: Mandatory after any first offenseMichigan: Mandatory only above a high-BAC thresholdMIMississippi: Court's discretion or restricted-license conditionMSMontana: Court's discretion or restricted-license conditionMTNew Hampshire: Court's discretion or restricted-license conditionNew York: Mandatory after any first offenseNYOhio: Court's discretion or restricted-license conditionOHOregon: Mandatory after any first offenseORTennessee: Mandatory after any first offenseTNUtah: Mandatory after any first offenseUTVirginia: Court's discretion or restricted-license conditionVAWashington: Mandatory after any first offenseWAWisconsin: Mandatory only above a high-BAC thresholdWINebraska: Mandatory after any first offenseNESouth Carolina: Mandatory after any first offenseSCIdaho: Mandatory after any first offenseIDNevada: Mandatory after any first offenseNVVermont: Court's discretion or restricted-license conditionLouisiana: Mandatory after any first offenseLARhode Island: Mandatory only above a high-BAC threshold
  • Mandatory after any first offense (22)
  • Mandatory only above a high-BAC threshold (12)
  • Court's discretion or restricted-license condition (17)
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<p>Map: <a href="https://wheelsback.com/">WheelsBack</a>, verified against state statutes.</p>
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Ignition interlock and SR-22 requirements by state
StateIID, first offenseMin. IID period (first)Repeat offenseSR-22Reinstatement feeVerified
AlabamaRequired only above a high-BAC threshold90 days2 yearsYes · 3 yr$275August 29
AlaskaRequired6 months12 monthsYes · 5 yr$200August 29
ArizonaRequired12 months, deferrable after 612 monthsYes · 3 yr$50 plus $10August 29
ArkansasRequired6 months (length of suspension)24 months (length of suspension)No$150August 29
CaliforniaAt the court's discretionUp to 6 months if court-ordered12 monthsYes · 3 yr$125August 29
ColoradoRequired only above a high-BAC threshold2 years if BAC 0.15+ or refusal2 yearsYes · 3 yr$120August 29
ConnecticutRequired1 year, 6 months if administrative3 years, 1 year if administrativeNo$175August 29
DelawareRequired12 months (4 if first-offender election)16 monthsNo$200August 29
District of ColumbiaRequired6 months1 yearYes · 3 yr$115August 29
FloridaRequired only above a high-BAC threshold6 continuous months1 continuous yearYes · 3 yr$75 + $130 administrative feeAugust 29
GeorgiaAt the court's discretionNot required (optional permit)12 monthsYes · 3 yr$200 by mail / $210 in personAugust 29
HawaiiRequired1 year to 18 months (revocation)2 to 3 years (revocation)Repeat offenses only · 3 yr$20August 29
IdahoRequired1 year1 yearYes · 3 yr$285August 29
IllinoisAt the court's discretion6 months, 12 if refused (MDDP)5 yearsYes · 3 yr$500August 29
IndianaAt the court's discretionSet by the courtSet by the courtYes · 3 yrNo fixed amount, per BMV recordAugust 29
IowaAt the court's discretionRestricted-license term or set by court1 yearYes · 2 yr$20 fee + $200 civil penaltyAugust 29
KansasRequired180 days1 yearYes · 1 yr$200August 29
KentuckyAt the court's discretion4 months12 monthsNo$40August 29
LouisianaRequired6 months6 monthsYes · 3 yr$100August 29
MaineAt the court's discretionRest of 150-day suspension, if elected2 yearsRepeat offenses only · 3 yr$50August 29
MarylandRequired6 months1 yearNo$150August 29
MassachusettsAt the court's discretionHardship-license term (BAC .15+ only)2 yearsNo$500August 29
MichiganRequired only above a high-BAC thresholdRest of 1-year suspension if BAC 0.17+1 year in specialty court, else hearingNo$125August 29
MinnesotaAt the court's discretion90 days, 1 year at 2× limit (optional)2 yearsNo$680August 29
MississippiAt the court's discretion120 days1 yearYes · 3 yr$175August 29
MissouriRequired only above a high-BAC threshold6 months6 monthsYes · 2 yr$45August 29
MontanaAt the court's discretionNot fixed by statuteProbation term, else 24/7 or forfeitureNo$200August 29
NebraskaRequired6 months (60 days with probation)1 yearYes · 3 yr$125August 29
NevadaRequired185 days1 yearYes · 3 yr$120August 29
New HampshireAt the court's discretionNo fixed statutory minimum12 monthsYes · 3 yr$100August 29
New JerseyRequired3 monthsForfeiture plus 2 to 4 yearsNo$100August 29
New MexicoRequired1 year2 yearsNo$102August 29
New YorkRequired12 months12 monthsNo$100August 29
North CarolinaRequired only above a high-BAC threshold1 year3 yearsYes · 3 yr$167.75August 29
North DakotaAt the court's discretionNo statutory minimumNo statutory period (24/7 program)Yes · 1 yr$100August 29
OhioAt the court's discretionNo statutory minimumRest of suspension (1 to 7 years)No$315August 29
OklahomaRequired180 active ignition-interlock days365 active ignition-interlock daysNo$315August 29
OregonRequired1 year2 yearsYes · 3 yr$85August 29
PennsylvaniaRequired only above a high-BAC threshold1 year1 yearNo$70August 29
Rhode IslandRequired only above a high-BAC threshold3 months to 1 year6 months to 2 yearsNo$353.50August 29
South CarolinaRequired6 months2 yearsYes · 3 yr$100August 29
South DakotaAt the court's discretionNot fixed by statuteNot fixed by statuteYes · 3 yr$100August 29
TennesseeRequired365 consecutive days365 consecutive daysYes$103August 29
TexasRequired only above a high-BAC threshold50% of supervision, or suspension term50% of supervision, or suspension termYes · 2 yr$100August 29
UtahRequired18 months2 yearsNo$85August 29
VermontAt the court's discretion90 days18 monthsYes · 1 yr$96August 29
VirginiaAt the court's discretion12 consecutive months12 consecutive monthsYes · 3 yr$220August 29
WashingtonRequired1 year5 yearsYes · 3 yr$170August 29
West VirginiaRequired only above a high-BAC threshold125 days2 yearsNo$50August 29
WisconsinRequired only above a high-BAC threshold1 year1 yearYes · 3 yr$200August 29
WyomingRequired only above a high-BAC threshold6 months1 yearYes · 3 yr$50August 29

Hover a shortened cell for the full text; the state page has the complete rule, its citation, and sources.

Reuse this data. The full dataset — every state, with statute citation, source URL and verification date — is available as CSV and JSON, licensed CC BY 4.0 — quote, adapt or republish it with attribution to wheelsback.com.

Related: SR-22 requirements after a DUI by state · what an interlock costs

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