Breath Test Refusals and Their Effect on DWI Prosecution

Jones, Ralph K.; Nichols, James L. · 2012 · ROSA P / United States. National Highway Traffic Safety Administration

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Summary

This 2012 report by the National Highway Traffic Safety Administration (NHTSA) investigates the prevalence of breath alcohol concentration (BAC) test refusals and their impact on the prosecution and sentencing of driving while intoxicated (DWI) cases. The study was motivated by the persistent rate of driver non-compliance with legal breath test requests, which deprives prosecutors of critical evidence regarding blood alcohol levels. The research aimed to determine whether this lack of evidence reduces the likelihood of DWI conviction and to update national refusal rates compared to prior studies from 1987 and 2001. The study employed a two-part design. First, researchers collected statewide refusal rate data from 39 jurisdictions (37 states, Puerto Rico, and the District of Columbia) for the year 2005, comparing these figures to historical data. Second, the study conducted in-depth case studies in five local jurisdictions selected to represent a range of refusal rates and legal environments: Ramsey County, Minnesota; Bernalillo County, New Mexico; Omaha, Nebraska; Montgomery County, Maryland; and King County, Washington. In these sites, researchers compared the prosecution outcomes, conviction rates, and sanctions for up to 1,000 breath test refusers against 1,000 compliers. Statistical methods, including logistic regression and General Linear Models, were used to control for offender characteristics such as age, sex, ethnicity, and prior offenses. The findings indicate that the national mean refusal rate remained stable at 21% in 2005, showing little change from previous decades. Regarding prosecutorial impact, the study found no clear, consistent relationship between refusing a BAC test and the probability of DWI conviction across the five sites. Conviction rates for refusers varied significantly by jurisdiction; for instance, refusers in Ramsey County had substantially higher conviction rates than non-refusers, while those in King County had lower rates. However, a negative correlation existed between statewide refusal rates and overall local conviction rates, suggesting that jurisdictions with higher refusal rates generally experienced lower conviction rates. Crucially, when refusers were convicted, they consistently received harsher penalties, including higher fines and longer jail sentences, than non-refusers who were convicted. The significance of this research lies in its clarification of the legal consequences of test refusal. While refusing a breath test does not uniformly protect drivers from conviction, it does not necessarily hinder prosecution success in all jurisdictions, particularly where refusal itself is criminalized. The consistent imposition of stricter sanctions on refusers suggests that current legal frameworks effectively penalize non-compliance. The study concludes that while refusal rates have remained stubbornly high, the judicial system adapts through varied prosecution strategies and enhanced penalties, though the lack of BAC data continues to complicate the assessment of impairment and the administration of justice.

Key finding

Drivers who refused breath tests and were subsequently convicted of DWI received significantly harsher penalties than convicted non-refusers, although refusal status did not consistently predict conviction rates across the five study jurisdictions.

Methodology

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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