Lower BAC Limits for Youth: Evaluation of the Maryland .02 Law [Final Report]
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Summary
This 1992 report by Richard D. Blomberg evaluates the effectiveness of Maryland’s 0.02% blood alcohol concentration (BAC) limit for drivers under 21, a sanction significantly stricter than the 0.10% limit for adults. The study was motivated by the persistent problem of alcohol-related crashes among youth and the theoretical premise that general deterrence relies on public awareness of sanctions. The research aimed to determine if the low-BAC law reduced crash involvement and whether a targeted Public Information and Education (PI&E) campaign could enhance the law’s deterrent effect. The study utilized a quasi-experimental design in Maryland, selected for its isolated media markets and existing legal framework. Researchers analyzed statewide crash data and focused on six specific counties: four experimental counties (Wicomico, Worcester, Dorchester, Somerset, Allegany, and Garrett) that received a PI&E campaign emphasizing penalties, and two comparison counties (St. Mary’s and Charles) that did not. The primary metric was the proportion of drivers under 21 involved in accidents who were judged by police to have "had been drinking" (HBD). Box-Jenkins time series analysis was employed to assess changes in HBD rates before and after the sanction’s adoption and the PI&E intervention. Additionally, surveys of youth in experimental and comparison counties measured knowledge of the law and media exposure. Results indicated a significant step reduction in crash-involved drivers under 21 judged HBD coincident with the adoption of the 0.02% sanction statewide. In the experimental counties, the PI&E campaign produced an additional significant reduction in HBD rates. This further reduction was not observed in the comparison counties, except for a minor effect in two of them. Survey data confirmed that knowledge of the sanction among youth increased significantly in experimental sites following the PI&E campaign, whereas no such increase occurred in comparison sites. The study concluded that the special sanction for youth was effective and that its effectiveness was significantly potentiated by a public service information program that highlighted the penalties for violation. The findings support the conclusion that lower BAC limits for youth can serve as an effective deterrent when coupled with public awareness campaigns. The study underscores the importance of general deterrence, demonstrating that legal sanctions are not fully operative if the target population is unaware of their existence or provisions. By increasing perceived probability of penalty through PI&E, the study showed that enforcement and education can work synergistically to reduce alcohol-related driving behaviors among young drivers.
Key finding
The adoption of the 0.02% BAC limit for youth significantly reduced crash-involved drivers under 21 judged to have been drinking, and this reduction was further enhanced by a public information and education campaign.
Methodology
field_study
Provenance
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| 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 | — | — | 24 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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- Applied Guidance: policy recommendations, countermeasure evaluation