Journal article
Charge combinations and conviction rates among alcohol-influenced drivers involved in motor vehicle crashes in Iowa
Journal of safety research, Vol.92, pp.375-384
02/2025
DOI: 10.1016/j.jsr.2024.12.008
Abstract
•Nearly one quarter (24.1 %) of impaired drivers did not receive an alcohol charge.•Most (96 %) charged drivers received at least one conviction.•Increasing types of charges given to impaired drivers increased the odds of conviction on any charge.•Increasing the number of charges increased the odds of conviction on any charge and on alcohol charges.•Convictions on alcohol charges were high overall.
Alcohol impairment is a major contributor to road traffic crashes and has increased across the United States in recent years. In 2022, over 13,000 people were killed in drunk driving crashes. Enforcement of impaired driving laws is an essential strategy to reduce alcohol-impaired driving and subsequent crashes. However, little is known about conviction outcomes related to alcohol-involved crashes. The aim of this study is to examine the association between charge combinations and conviction rates among alcohol-influenced drivers involved in crashes.
Data for this study included 2016–2019 Iowa Department of Transportation crash data linked to charges and convictions from the Iowa Court Information System. The study sample included drivers with reported BAC ≥ 0.08 g/dl and/or driver condition reported as under influence of alcohol. Charges were divided into three categories: alcohol, moving, and administrative/miscellaneous. Two logistic regression models were built with any conviction and alcohol conviction as the outcomes. The main predictor was charge combination.
The study sample included 8,238 alcohol-impaired drivers, of whom 6,846 (83.1%) were charged with any type of traffic offense and 6,253 (75.8%) were charged with alcohol-related traffic offenses. Among charged drivers, 96.2% were convicted on any traffic charge and 87.7% were convicted on an alcohol charge. Drivers with a combination of alcohol, administrative, and moving violation charges had higher odds of any conviction (OR = 2.6, 95% CI = 1.7–4.3) compared to drivers with only alcohol charges.
Charging impaired drivers with multiple types of charges was associated with increased odds of conviction on any charge but not on alcohol charges, which had high conviction rates overall.
Results from this study can help guide law enforcement to ensure appropriate charges are made in all relevant categories and optimal combinations of charges are administered to impaired drivers to increase odds of conviction.
Details
- Title: Subtitle
- Charge combinations and conviction rates among alcohol-influenced drivers involved in motor vehicle crashes in Iowa
- Creators
- Cara J. Hamann - Injury Prevention Research Center, University of Iowa, 145 N Riverside Dr., S449 CPHB, Iowa City, IA 52242, USAStephanie Jansson - University of IowaLinder Wendt - University of IowaMichelle Reyes - Driving Safety Research Institute, University of Iowa College of Engineering, 2401 Oakdale Blvd, Iowa City, IA 52242, USAJon Davis - Injury Prevention Research Center, University of Iowa, 145 N Riverside Dr., S449 CPHB, Iowa City, IA 52242, USAJoseph E. Cavanaugh - Injury Prevention Research Center, University of Iowa, 145 N Riverside Dr., S449 CPHB, Iowa City, IA 52242, USACorinne Peek-Asa - University of California San Diego
- Resource Type
- Journal article
- Publication Details
- Journal of safety research, Vol.92, pp.375-384
- DOI
- 10.1016/j.jsr.2024.12.008
- ISSN
- 0022-4375
- eISSN
- 1879-1247
- Publisher
- Elsevier Ltd
- Grant note
- Iowa Governor's Traffic Safety Bureau: PAP 20-405c-M3DA, PAP 20-405d-FDL, PAP 20-405d-FDL*403R National Center for Injury Prevention and Control/CDC: 5R49CE003095
This study was funded in part from the Iowa Governor's Traffic Safety Bureau (PAP 20-405c-M3DA, Task 01; PAP 20-405d-FDL*IS, Task 0-03-00; and PAP 20-405d-FDL*403R, Task 01-00-00) and the National Center for Injury Prevention and Control/CDC (5R49CE003095) .
- Language
- English
- Date published
- 02/2025
- Academic Unit
- Statistics and Actuarial Science; Occupational and Environmental Health; Epidemiology; Biostatistics; Driving Safety Research Institute; Center for Social Science Innovation; Injury Prevention Research Center; School of Planning and Public Affairs
- Record Identifier
- 9984759116602771
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