An analysis of OWI arrests and convictions in Iowa.

Gorton, Joe; Crew, Keith · 2011 · ROSA P / University of Northern Iowa. Center for Social and Behavioral Research

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Summary

This study, conducted by researchers at the University of Northern Iowa and sponsored by the Iowa Department of Transportation, analyzes trends in Operating While Intoxicated (OWI) arrests, convictions, and alcohol-related traffic fatalities (ARTFs) in Iowa from 2000 to 2009. The primary objective was to document the demographic profile of OWI offenders and evaluate how population shifts, arrest rates, and convictions influenced ARTF prevalence. The research aimed to provide a foundation for future analysis regarding the efficacy of Iowa’s criminal and civil OWI sanctions. The methodology combined aggregate data from sources such as the FBI Uniform Crime Reports, the Iowa Department of Public Safety, and the National Highway Traffic Safety Administration’s Fatality Analysis Reporting System with case-level data from Iowa’s Justice Data Warehouse. The final sample comprised 118,675 OWI convictions or deferred judgments. Researchers utilized frequencies, crosstabs, comparison of means, and regression analysis to identify trends across demographic variables, including gender, age, race, and ethnicity. The findings reveal that the typical convicted OWI offender in Iowa was a White male, approximately 30 years old, residing in an urban area. However, significant demographic shifts occurred during the study period. The percentage of convictions received by women increased by 66%, and the gap between White offenders and minority offenders narrowed. African Americans, Hispanics, and Native Americans were overrepresented among convicted offenders relative to their population shares, while Whites were underrepresented. Notably, the percentage of aggravated misdemeanor and felony OWI convictions received by Hispanics and African Americans increased significantly between 2000 and 2009. Additionally, statistically significant increases in convictions for women and African Americans were observed following the 2003 implementation of the .08 BAC law. Regarding fatalities, the study found no convincing evidence of a direct relationship between enforcement trends and declines in ARTFs. However, Iowa conviction trends provided evidence of a "conviction lag effect" on ARTFs, suggesting that sentencing outcomes may influence fatality rates through incapacitation or rehabilitation mechanisms. The significance of this research lies in its detailed demographic profiling of OWI offenders and its identification of the complex relationship between conviction trends and traffic fatalities. The authors conclude that population shifts affected the supply of residents at risk for alcohol-impaired driving, thereby influencing ARTF trends. The study highlights that while deterrent effects may be limited due to offenders' impaired rationality, incapacitation and rehabilitative sanctions may reduce recidivism. These findings establish a basis for a second phase of research to assess the specific efficacy of sentencing practices, particularly regarding the differential impacts of incapacitation versus rehabilitation on first-time versus repeat offenders.

Key finding

The percentage of OWI convictions received by women and African Americans increased significantly after the implementation of the .08 BAC law.

Methodology

dataset

Sample size: 118675

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• dui enforcement