The Incidence of Drugs in Fatally Injured Drivers [1974]

Woodhouse, Edward J. · 1974 · ROSA P / United States. National Highway Traffic Safety Administration

archive: archived pipeline: cataloged verified

Get this paper ↗ (full text — opens at the source; we link to it, we don't host it)

Summary

This 1974 report by the Midwest Research Institute, commissioned by the National Highway Traffic Safety Administration (NHTSA), investigates the incidence of drugs in fatally injured drivers. The study was motivated by the need to determine the significance of drug use in highway fatalities, specifically aiming to establish baseline data on drug presence in drivers who died in crashes. The project spanned 28 months, from June 1971 to October 1973, with the objective of developing standardized methods for specimen collection and analysis, and applying these methods to a sample of up to 1,000 cases. The methodology involved the distribution of specialized specimen collection kits to coroners and medical examiners in 57 areas across the United States. These kits contained equipment for collecting blood, urine, bile, and alcohol washes of the face and fingers. Of 1,731 kits distributed, 710 were returned, with 699 specimens collected from fatally injured drivers. The analytical protocol utilized ion-exchange resin extraction followed by qualitative thin-layer chromatography (TLC) screening for 44 commonly abused drugs. Positive screens were confirmed quantitatively using gas chromatography, with mass spectrometry employed for additional qualitative verification when necessary. Blood alcohol content was determined via gas chromatography, while marijuana contact was assessed using TLC and colorimetric methods on face and finger swabs. The results indicated that 58% of the drivers had ingested alcohol, with 47% classified as legally drunk (blood alcohol concentration ≥ 0.100%). Prescription drugs were present in 13% of the drivers, with sedative/hypnotic drugs being the most prevalent, found in over 7% of cases. Notably, over 5% of drivers tested positive for prescription drugs in the absence of alcohol. The marijuana contact test yielded positive responses in 38% of drivers, though the report notes significant variability in this metric due to methodological changes during the study, with estimates ranging from 1.68% to 49%. The study concludes that certain drugs, particularly marijuana and barbiturates, may constitute a highway safety problem. However, the authors emphasize that the findings are preliminary and cannot be generalized to the broader population of fatally injured drivers due to sampling limitations and the non-representative nature of the cases. Furthermore, the presence of drugs in body fluids does not definitively prove impairment at the time of the crash, as drugs can persist in bile and urine long after their clinical effects have ceased. The report recommends further research to improve testing reliability, particularly for marijuana, and to better understand the relationship between drug concentrations and driving performance.

Key finding

47% of fatally injured drivers were legally drunk and 13% had evidence of prescription drugs, with marijuana contact detected in up to 49% of cases via swab tests.

Methodology

dataset

Sample size: 710

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).

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

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• illicit drugs
• cannabis
• polydrug