An analysis of current Virginia statutes relating to driving under the influence of drugs.

Ames, W. Allen · 1972 · ROSA P / Virginia Transportation Research Council (VTRC)

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Summary

This 1972 report by W. Allen Ames analyzes the legal and practical challenges surrounding Virginia’s statutes prohibiting driving under the influence of drugs. The study was motivated by the observation that while all 50 states had prohibitions against drug-impaired driving, Virginia’s specific statute (Va. Code Ann. §18.1-54) suffered from significant ambiguity and a complete lack of enforcement. The author notes that no convictions had ever been reported under this provision, largely due to difficulties in detection and the absence of clear legal standards for impairment. The methodology involves a comparative legal analysis of Virginia’s code against the Uniform Vehicle Code (UVC) and statutes from other jurisdictions, such as Maryland and North Carolina. Ames examines the definitions of key terms like "under the influence," "drug," and "narcotic drug," and evaluates the feasibility of adopting UVC provisions regarding "habitual users" and prescribed medications. The analysis also assesses the scientific limitations of drug detection compared to alcohol testing, noting that chemical tests for drugs are complex, require prior knowledge of the specific substance, and lack the standardized presumptive levels available for blood alcohol content. The findings highlight several critical deficiencies in Virginia’s law. First, the statute fails to define the degree of impairment required for a violation, unlike the UVC, which specifies that a driver must be rendered "incapable of safely driving." Second, the terms "drug" and "narcotic drug" are not defined within the motor vehicle code, creating interpretive uncertainty. Third, the statute’s restriction to "self-administered" drugs creates a potential loophole for those using physician-prescribed medications, though the author argues this distinction is legally ambiguous. Finally, the report concludes that adopting a prohibition against "habitual users" is premature due to a lack of scientific evidence linking habitual use to impaired driving and existing laws regarding license suspension for addicts. The significance of the report lies in its recommendations for legislative reform and enforcement strategy. Ames recommends clarifying the statute by adopting UVC language that explicitly ties liability to the inability to drive safely. He suggests defining drug terms within the motor vehicle code or referencing the 1970 Drug Control Act. Regarding prescribed drugs, he advocates for requiring physicians to warn patients of driving risks rather than creating a strict liability class of violators. Crucially, the report concludes that extending implied consent laws to drugs is premature until scientific methodology improves detection capabilities. Until such methods are developed, the focus should remain on identifying enforcement barriers and improving detection techniques.

Key finding

Virginia's driving under the influence of drugs statute is unenforced and legally imprecise, requiring clarification of impairment standards and drug definitions to improve legal clarity and enforcement potential.

Methodology

review

Provenance

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Topics

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