Interlock requirements by state

Name: Ignition interlock requirements by state
Creator: InterlockCompare

Every column comes from the IIHS review of state interlock laws (October 2026). The first column is our grouping of those answers. Free to reuse with a link back.

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State	Our grouping	First offense: to drive during the administrative suspension	First offense: to drive during the post-conviction suspension	Repeat: to drive during the post-conviction suspension	First offense: as a penalty or to reinstate	Repeat: as a penalty or to reinstate
Alabama	First conviction	no option for driving during suspension	yes	yes	no	yes
Alaska	First conviction	yes	yes	yes	yes	yes
Arizona	First conviction	no, although interlock use is incentivized	no, although interlock use is incentivized	yes	yes	yes
Arkansas	First conviction	yes	no statutorily mandated post-conviction license suspension	no statutorily mandated post-conviction license suspension	yes	yes
California	Repeat only	no, although interlock use is incentivized	no	no, although interlock use is incentivized	no	yes
Colorado	First conviction	yes	yes	yes	yes (effective 06/01/27)	yes
Connecticut	First conviction	no option for driving during suspension, which lasts 45 days, after which interlock required to reinstate	no option for driving during suspension, which lasts 45 days, after which interlock required to reinstate	no option for driving during suspension, which lasts 45 days, after which interlock required to reinstate	yes	yes
Delaware	First conviction	no option for driving during suspension	yes	yes	no	no
District of Columbia	First conviction	yes	no option for driving during suspension	no option for driving during suspension	yes	yes
Florida	High BAC only	no	no, unless offenders' BAC at or above 0.15	yes	no, unless offenders' BAC at or above 0.15	yes
Georgia	Repeat only	no, although interlock use is incentivized	no	yes	no	yes
Hawaii	First conviction	yes	yes	yes	yes	yes
Idaho	First conviction	no, although interlock required to reinstate	yes	no option for driving during suspension	yes	yes
Illinois	Repeat only	yes	no	yes	no	yes
Indiana	Neither	no	no	no	no	no
Iowa	First conviction	yes	yes	yes	no	yes
Kansas	First conviction	yes	yes	yes	yes	yes
Kentucky	First conviction	no ALS for first test failure	yes	yes	no	no
Louisiana	First conviction	no, although interlock use is incentivized	yes	yes	no	no
Maine	Repeat only	no, although interlock use is incentivized	no, although interlock use is incentivized	yes	no	no
Maryland	First conviction	no, although interlock use is incentivized	yes, if license suspension imposed	yes	yes, for "driving under the influence" violations	yes
Massachusetts	Repeat only	no option for driving during suspension, which lasts 30 days	no	yes	no	yes
Michigan	High BAC only	no ALS for first test failure	no, unless offenders' BAC at or above 0.17	yes	no	yes
Minnesota	Repeat only	no, although interlock use for offenders below 0.16 is incentivized	no, although interlock use for offenders below 0.16 is incentivized	yes	no	yes
Mississippi	First conviction	yes	yes	yes	no	no
Missouri	High BAC only	no, unless offenders' BAC at or above 0.15	no, unless offenders' BAC at or above 0.15	yes	no	yes
Montana	Neither	no ALS for first test failure	no	no	no	no
Nebraska	First conviction	no	yes	yes	yes	yes
Nevada	Neither	no	no	no	no	no
New Hampshire	First conviction	no option for driving during suspension	yes	no option for driving during suspension	no	yes
New Jersey	First conviction	no ALS for first test failure	no suspension after conviction	yes	yes	yes
New Mexico	First conviction	yes	yes	yes	yes	yes
New York	First conviction	no ALS for first test failure	yes, as a condition of probation or conditional discharge	yes	yes, as a condition of probation or conditional discharge	yes
North Carolina	High BAC only	no, although interlock use is incentivized	no, although interlock use for offenders below 0.15 is incentivized and required for offenders with BAC at or above 0.15	yes (2nd conviction below 0.15); no option for driving during suspension for 2nd conviction if BAC is at or above 0.15 or for 3rd conviction and beyond	no, unless offenders' BAC at or above 0.15	yes
North Dakota	Neither	no	no	no	no	no
Ohio	Repeat only	no	no, although interlock use is incentivized	yes	no	no
Oklahoma	First conviction	yes	yes	yes	yes	yes
Oregon	First conviction	no	yes	yes	yes	yes
Pennsylvania	High BAC only	no ALS for first test failure	no, unless offenders' BAC at or above 0.10	yes	no, unless offenders' BAC at or above 0.10	yes
Rhode Island	Neither	no ALS for first test failure	no	no	no	no
South Carolina	First conviction	no ALS for first test failure	no option for driving during suspension	no option for driving during suspension	yes	yes
South Dakota	Neither	no ALS for first test failure	no	no	no	no
Tennessee	First conviction	no ALS for first test failure	yes	yes	no	no
Texas	First conviction	no	yes, if license suspension imposed	yes	no	yes, when prior conviction occurred within the past 5 years
Utah	First conviction	yes	no option for driving during suspension	no option for driving during suspension	yes	yes
Vermont	First conviction	yes	yes	yes	no	yes
Virginia	First conviction	no option for driving during suspension, which lasts 7 days	yes	yes	no	yes
Washington	First conviction	yes	yes	yes	yes	yes
West Virginia	First conviction	no ALS for first test failure	yes	yes	no	yes
Wisconsin	Neither	no	no	no	no	no
Wyoming	High BAC only	no	no	yes	no, unless offenders' BAC at or above 0.15	yes

Source: https://www.iihs.org/research-areas/alcohol-and-drugs/alcohol-interlock-laws-by-state. IIHS notes its table is for general information and should be checked against current law.