A State-by-State Analysis of Laws Dealing with Driving under the Influence of Drugs

Walsh, J. Michael · 2009 · ROSA P / United States. National Highway Traffic Safety Administration. Office of Behavioral Safety Research

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Summary

This report, commissioned by the National Highway Traffic Safety Administration (NHTSA) and authored by J. Michael Walsh, addresses the legal inconsistencies surrounding driving under the influence of drugs (DUID) in the United States. Motivated by evidence that nearly 5% of licensed drivers had driven under the influence of illicit drugs in the previous year, the study aims to fulfill requirements under the SAFETEA-LU Act to assess current state and federal laws. The research highlights a significant gap between the prevalence of drugged driving and the public awareness, detection, and prosecution rates compared to alcohol-impaired driving. The methodology involved a comprehensive review of statutes in all 50 states, the District of Columbia, and Puerto Rico as of December 2008. The analysis categorized laws into three primary types: those requiring proof that drugs rendered a driver “incapable” of safe driving; those requiring proof of impairment or being “under the influence”; and “per se” statutes that criminalize the presence of specific drugs or metabolites in the body regardless of observed impairment. The report also examined ancillary legal provisions, including defenses based on legal entitlement or prescription, implied consent laws for chemical testing, and the availability of forced specimen collection. The findings reveal a high degree of variability and a lack of uniformity in how states approach DUID. While 17 states had enacted per se laws covering roughly 40% of licensed drivers, the majority of states relied on impairment or incapacity standards, which are technically difficult to prove in court. Most states disallow legal entitlement to use a drug as a defense, though exceptions exist for prescribed medications in certain jurisdictions. Implied consent laws extended to DUID in 45 states, but only a subset imposed criminal penalties for refusal. Furthermore, most states combine DUID and alcohol-impaired driving (DUI) into single statutes with identical penalties, making it difficult to distinguish between drug and alcohol offenses in enforcement data. While roughly 35 states mandated substance abuse treatment or education for offenders, the specific sanctions varied widely, ranging from light fines to felony charges for repeat offenses. The study concludes that current laws in many states hinder the identification, prosecution, and conviction of drugged drivers due to evidentiary burdens and the lack of distinct offenses for drug impairment. The authors argue that the absence of separate sanctions for DUID provides little incentive for criminal justice officials to pursue drug-related charges. Consequently, the report calls for national leadership to develop model statutes and encourage states to modify their laws to create more effective, distinct legal frameworks for addressing drug-impaired driving.

Key finding

There is a high degree of variability across states in their approach to drug-impaired driving, with current laws in many states containing provisions that make it difficult to identify, prosecute, or convict drug-impaired drivers.

Methodology

dataset

Provenance

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

Topics

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• illicit drugs
• dui enforcement
• polydrug
• drowsy as impairment
• cannabis