Pilot Test of Selected DWI Detection Procedures for Use at Sobriety Checkpoints
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Summary
This 1985 NHTSA technical report evaluates the effectiveness of specific screening procedures for detecting alcohol-impaired drivers at sobriety checkpoints. The study was motivated by the need to ensure that checkpoint enforcement remains effective and credible; if officers fail to detect impaired drivers, the deterrent effect of checkpoints diminishes. The research aimed to determine whether structured detection techniques could more accurately discriminate between impaired and sober drivers during the brief initial stop than the subjective judgments typically used by police. The experimental design simulated real-world checkpoint conditions on a closed street illuminated by streetlights. Seventy-five male volunteers drove their own vehicles through three checkpoints staffed by officers from the Massachusetts State Police, the Metropolitan District Commission Police, and the Maryland State Police. Drivers were assigned to one of three conditions: sober, dosed to a blood alcohol concentration (BAC) of approximately 0.07%, or dosed to approximately 0.12%. Officers were blind to the drivers' BAC levels. The study compared two screening methods: a "typical" procedure involving brief observation and conversation, and a "test" procedure comprising the horizontal gaze nystagmus (HGN) test, a divided attention task, and formal observations of driving behavior and personal appearance. Researchers also measured stopping distance and used a passive alcohol sensor (PAS) as objective benchmarks. The results demonstrated that the test screening procedure significantly outperformed the typical subjective method. Officers using the test procedure correctly identified 95% of drivers with a BAC of 0.10% or higher, while misidentifying very few sober drivers. In contrast, the typical procedure yielded lower accuracy. The high performance of the test procedure was primarily attributed to the HGN test, which was administered through the open car window in approximately 40 seconds. Officers with 16 hours of HGN training and prior field experience achieved 100% detection of impaired drivers, compared to 89% for those with only three hours of training. The passive alcohol sensor also proved effective, correctly identifying 94% of impaired drivers, though it produced a 10% false-positive rate for sober drivers. Conversely, the divided attention task and observations of driving behavior failed to consistently discriminate between impaired and sober drivers. Specific appearance cues, such as the odor of alcohol, flushed face, and dilated eyes, did correlate with impairment. The study concludes that standard checkpoint screening can be substantially improved by incorporating the horizontal gaze nystagmus test or a properly used passive alcohol sensor. These tools allow officers to quickly and accurately identify impaired drivers while minimizing the unnecessary detention of sober motorists. The findings support the adoption of structured, empirically based detection procedures to maintain the efficacy and legal defensibility of sobriety checkpoint programs.
Key finding
Officers using a structured test screening procedure correctly identified 95% of impaired drivers, a performance primarily driven by the horizontal gaze nystagmus test, which outperformed typical subjective observation methods.
Methodology
simulator
Sample size: 75
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via bulk_ingest_rosap on 2026-05-23 (6 acquisition events logged).
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | rosap | — | — | 2 | 2026-05-23 |
| archive | success | — | — | — | 1 | 2026-05-23 |
| extract | success | cached | — | — | 2 | 2026-06-10 |
| clean | success | — | — | — | 1 | 2026-06-01 |
| chunk | success | — | — | — | 1 | 2026-06-01 |
| embed | success | — | — | — | 1 | 2026-06-02 |
| enrich | success | — | — | — | 1 | 2026-05-23 |
| promote | success | — | — | — | 1 | 2026-05-23 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 3 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 19 | 2026-06-11 |
| verify | partial | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified_with_issues.
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- Methodological Resource: measurement protocol, validation psychometrics