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DUID prevalence in Colorado's DUI citations
Ed Wood1, Stacy Salomonsen-Sautel2
1DUID Victim Voices, Morrison, CO, USA.
Journal of Safety Research
|May 15, 2016
Summary
Drugged driving is a frequent cause of citations for vehicular homicide and assault in Colorado. Polydrug use, not just marijuana, is the most common issue, complicating impairment identification and legal proceedings.
Area of Science:
- Forensic Science
- Public Health
- Traffic Safety
Background:
- Limited studies exist on drug-impaired driving (DUID) prevalence based on impairment measures.
- Most DUID prevalence studies rely on drug tests, not direct impairment assessments.
- Vehicular homicide (VH) and vehicular assault (VA) cases offer a unique data source for DUID prevalence.
Purpose of the Study:
- To provide the first estimate of DUID prevalence in Colorado using VH and VA court records.
- To analyze the types of substances involved in DUID cases leading to VH or VA charges.
- To investigate the role of polydrug use versus single-drug use in DUID incidents.
Main Methods:
- Analysis of court records from Colorado law enforcement in vehicular homicide and vehicular assault cases.
- Statistical analysis including independent t-tests, Mann-Whitney U tests, Pearson chi-square, Fisher's exact tests, and Kruskal-Wallis tests.
- Categorization of cases based on alcohol only, drugs only, or a combination of alcohol and drugs.
Main Results:
- 30% of cases involved drugs (51 out of 170); 19 cases involved drugs only.
- Polydrug use was common, with 32 cases involving both alcohol and drugs.
- Marijuana was the most cited drug, but only identified as the sole impairing substance in three cases.
Conclusions:
- Drugged driving is a significant factor in VH and VA cases in Colorado.
- Polydrug use is more prevalent than single-drug (marijuana) use in these DUID cases.
- Current warrant procedures may compromise the validity of blood test results for marijuana impairment.
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