Alcohol interlock laws

Laws requiring interlocks for all impaired-driving offenders reduce alcohol-involved crashes. Read more on our main alcohol and drugs page.

This material has been prepared for general information purposes only. It is not guaranteed to be current and should be independently verified. Do not rely on it when considering how a law may apply to your circumstances.

September 2023

State	to drive during ALS (first offense)	to drive during post-conviction license suspension		to reinstate license after conviction
	Interlock required
State	to drive during ALS (first offense)	First offender	Repeat offender	First offender	Repeat offender
Alabama	no option for driving during suspension	yes	yes	no	yes
Alaska	yes	yes	yes	yes	yes
Arizona	no, although interlock use is incentivized^{Footnote 1}	no	yes	yes	yes
Arkansas	yes	yes	yes	yes^{Footnote 2}	yes^{Footnote 2}
California	no, although interlock use is incentivized^{Footnote 1}	no	no, although interlock use is incentivized^{Footnote 3}	no	yes
Colorado	yes	yes	yes	no	yes
Connecticut	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	no option for driving during suspension^{Footnote 4}	yes	yes	no	no
District of Columbia	yes	no option for driving during suspension	no option for driving during suspension	yes	yes
Florida	no	no, unless offenders' BAC at or above 0.15	yes	no, unless offenders' BAC at or above 0.15	yes
Georgia	no, although interlock use is incentivized^{Footnote 5}	no	yes	no	yes
Hawaii	yes	yes	yes	yes	yes
Idaho	no, although interlock required to reinstate	no for offenders with BAC below 0.20; no option for driving during suspension for offenders with BAC at or above 0.20^{Footnote 6}	no option for driving during suspension^{Footnote 7}	yes	yes
Illinois	yes	no	yes	no	yes
Indiana	no	no	no	no	no
Iowa	yes	yes	yes	no	yes
Kansas	yes	yes	yes	yes	yes
Kentucky	no ALS for first test failure	yes	yes	no	no
Louisiana	no, although interlock use is incentivized^{Footnote 1}	yes	yes	no	no
Maine	no, although interlock use is incentivized^{Footnote 8}	no, although interlock use is incentivized^{Footnote 8}	yes	no	no
Maryland	no, although interlock use is incentivized^{Footnote 5}	yes, if license suspension imposed	yes	yes, for "driving under the influence" violations	yes
Massachusetts	no option for driving during suspension, which lasts 30 days	no	yes	no	yes
Michigan	no ALS for first test failure	no, unless offenders' BAC at or above 0.17	yes	no	yes
Minnesota	no, although interlock use for offenders below 0.16 is incentivized^{Footnote 5} and interlock required for offenders with BAC at or above 0.16	no, although interlock use for offenders below 0.16 is incentivized^{Footnote 5} and interlock required for offenders with BAC at or above 0.16	yes	no	no
Mississippi	yes	yes	yes	no	no
Missouri	no, although interlock use is incentivized^{Footnote 1}	no, although interlock use is incentivized^{Footnote 1}	yes	no	yes
Montana	no ALS for first test failure	no	no	no	no
Nebraska	no	yes^{Footnote 9}	yes^{Footnote 9}	yes^{Footnote 9}	yes^{Footnote 9}
Nevada	no^{Footnote 10}	no^{Footnote 10}	no^{Footnote 10}	no^{Footnote 10}	no^{Footnote 10}
New Hampshire	no option for driving during suspension	yes	no option for driving during suspension	no	yes
New Jersey	no ALS for first test failure	no suspension after conviction	yes	yes	yes
New Mexico	yes	yes	yes	yes	yes
New York	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	no	no, although interlock use for offenders below 0.15 is incentivized^{Footnote 5} and interlock required for offenders with BAC at or above 0.15	no option for driving during suspension	no, unless offenders' BAC at or above 0.15	yes
North Dakota	no	no	no	no	no
Ohio	no	no, although interlock use is incentivized^{Footnote 5}	yes	no	no
Oklahoma	yes	yes	yes	yes	yes
Oregon	no	yes	yes	yes	yes
Pennsylvania	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	no ALS for first test failure	no^{Footnote 11}	no^{Footnote 11}	no	no^{Footnote 11}
South Carolina	no ALS for first test failure	no option for driving during suspension (effective 05/26/24)	no option for driving during suspension	yes (effective 05/26/24)	yes
South Dakota	no ALS for first test failure	no	no	no	no
Tennessee	no ALS for first test failure	yes	yes	no	no
Texas	no	yes, if license suspension imposed	yes	no	yes, when prior conviction occurred within the past 5 years
Utah	yes	no option for driving during suspension	no option for driving during suspension	yes	yes
Vermont	yes	yes	yes	no	yes
Virginia	no option for driving during suspension, which lasts 7 days	yes	yes	no	yes
Washington	yes	yes	yes	yes	yes
West Virginia	no ALS for first test failure	yes	yes	no	yes
Wisconsin	no	no	no	no	no
Wyoming	no	no	yes	no, unless offenders' BAC at or above 0.15	yes

Footnotes

^{Footnote 1} Arizona, California, Louisiana, and Missouri eliminate the mandatory ("hard") suspension period if offender chooses to install an interlock. ↩
^{Footnote 2} Arkansas requires an interlock for a first and second offender, unless the offender is driving an employer's vehicle for employment purposes, not able to provide a deep lung breath sample, or resides more than 100 miles from an ignition interlock provider. ↩
^{Footnote 3} California eliminates the mandatory ("hard") suspension period if offender chooses to install an interlock. ↩
^{Footnote 4} In Delaware, the license could potentially be restored during suspension once the Office of Highway Safety has established a continuous sobriety monitoring program. ↩
^{Footnote 5} Georgia, Maryland, Minnesota, North Carolina, and Ohio grant unlimited driving privileges during the suspension period if the offender chooses to install an interlock. ↩
^{Footnote 6} In Idaho, any offender with a BAC at or above 0.20 and enrolled in a qualifying problem-solving court shall be eligible for restricted noncommercial driving privileges with an interlock for the purpose of getting to and from work, school, or an alcohol treatment program. ↩
^{Footnote 7} In Idaho, any repeat offender enrolled in a qualifying problem-solving court shall be eligible for restricted noncommercial driving privileges with an interlock for the purpose of getting to and from work, school, or an alcohol treatment program. ↩
^{Footnote 8} Maine significantly reduces the length of the mandatory suspension period if the offender chooses to install an interlock. ↩
^{Footnote 9} In Nebraska, effective July 1, 2022, an individual whose license is administratively revoked following an arrest for DUI may request an ignition interlock permit or a 24-7 sobriety program permit. Because the individual is granted day-for-day credit toward any post-conviction license revocation, it is possible for the individual to avoid a mandatory post-conviction ignition interlock requirement. ↩
^{Footnote 10} Nevada authorizes a restricted license without an ignition interlock for any offender who participates in a 24-7 sobriety program, as well as for a first offender who is not able to provide a deep lung breath sample or resides more than 100 miles from an ignition interlock manufacturer or its agent. ↩
^{Footnote 11} In Rhode Island, effective January 1, 2022, the court must order an ignition interlock system and/or blood and urine testing in order for the convicted person to drive during the suspension or for a repeat offender to restore licensure. ↩