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.

November 2024

Interlock required
State to drive during ALS (first offense) to drive during post-conviction license suspension period as a penalty or to reinstate license after conviction
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 incentivizedFootnote 1 no, although interlock use is incentivizedFootnote 1 yes yes yes
Arkansas yes no statutorily mandated post-conviction license suspension no statutorily mandated post-conviction license suspension yesFootnote 2 yes
California no, although interlock use is incentivizedFootnote 1 no no, although interlock use is incentivizedFootnote 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 suspensionFootnote 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 incentivizedFootnote 5 no yes no yes
Hawaii yes yes yes yes yes
Idaho no, although interlock required to reinstate yesFootnote 6 no option for driving during suspensionFootnote 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 incentivizedFootnote 1 yes yes no no
Maine no, although interlock use is incentivizedFootnote 8 no, although interlock use is incentivizedFootnote 8 yes no no
Maryland no, although interlock use is incentivizedFootnote 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 incentivizedFootnote 5 and interlock required for offenders with BAC at or above 0.16 no, although interlock use for offenders below 0.16 is incentivizedFootnote 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 incentivizedFootnote 1 no, although interlock use is incentivizedFootnote 1 yes no yes
Montana no ALS for first test failure no no no no
Nebraska no yesFootnote 9 yesFootnote 9 yesFootnote 9 yesFootnote 9
Nevada noFootnote 10 noFootnote 10 noFootnote 10 noFootnote 10 noFootnote 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 convictionFootnote 11 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 incentivizedFootnote 5 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 (effective 12/01/24) no, unless offenders' BAC at or above 0.15 yes
North Dakota no no no no no
Ohio no no, although interlock use is incentivizedFootnote 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 noFootnote 12 noFootnote 12 no noFootnote 12
South Carolina no ALS for first test failure no option for driving during suspension no option for driving during suspension yes 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