This report covers an analysis of the driving records of Ohio’s 45,788 drivers who were convicted of driving under the influence (DUI) between July 1, 1990, and August 30, 1995, to determine the specific deterrent impact of the Ohio administrative license suspension (ALS) law on DUI recidivism. Our data support the conclusion that, under the ALS law, license suspensions were earlier and more certain. Consequently, the number of drunk-driving convictions, moving offenses, and crashes of first and multiple DUI offenders were significantly reduced in the 2 years after their arrest for DUI.