United States Department of Transportation
i
State of the Practice of State Alcohol Ignition Interlock Programs
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2023-01-01
[PDF-2.02 MB]
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Edition:Final Report July 2020 – September 2021
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Abstract:A breath alcohol ignition interlock device (BAIID, or interlock) prevents a vehicle from being driven unless the driver provides a breath sample indicating a blood alcohol concentration lower than a pre-set level, usually .02 g/dL. Every State uses interlocks as a sanction for driving while impaired (DWI) offenses. The law may dictate that a DWI offender is required to use an interlock, or it may allow an offender the option to use an interlock in lieu of a harsher sanction such as license suspension or revocation. Offenders using interlocks must enroll in the State BAIID program to arrange for interlock installation, management, and removal. State BAIID programs vary due to variations in DWI and licensing laws. This project sought to document the state of the practice of BAIID programs by inviting BAIID program administrators and staff from each State to complete surveys or discuss the program features. Thirty-eight State programs completed the survey, participated in the discussions, or both. Thirteen programs (including the District of Columbia) did not participate in either, limiting the completeness of the findings. The project data are summarized online, located at: https://aic.tirf.ca/alcohol-interlock-program-inventory/. This project was conducted under the National Cooperative Research and Evaluation Program, a cooperative program between NHTSA and the Governors Highway Safety Association (GHSA). Each year, the States (through the GHSA) identify highway safety research or evaluation topics they believe are important for informing State policy, planning, and programmatic activities. This report addresses one of those requested topics, the need for current information on interlock programs.
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