What interventions actually work to prevent drugged driving?
A systematic review of 28 studies found that cannabis packaging warnings, roadside drug testing, and motivational interviewing showed the strongest evidence for preventing drugged driving, while state-level legal sanctions showed little effect on drug-related fatalities.
Quick Facts
What This Study Found
Cannabis packaging with health warnings increases knowledge about drugged driving effects (high certainty). Roadside drug testing can reduce drugged driving among cannabis users (moderate certainty). For youth, motivational interviewing can prevent drugged driving and driver education increases knowledge (moderate certainty). State sanctions, including criminalization and per-se laws, showed little or no effect on drug-related fatalities (very low to low certainty).
Key Numbers
11 RCTs + 17 nonrandomized studies; 33,711 youth participants; packaging warnings: high certainty; roadside testing: moderate certainty; motivational interviewing: moderate certainty; legal sanctions: very low to low certainty
How They Did This
Systematic review searching MEDLINE, PsycINFO, Web of Science, Embase, and other databases through May 2020. Included 11 RCTs and 17 nonrandomized studies (predominantly youth aged 15-25, n=33,711). Evidence certainty rated using GRADE guidelines.
Why This Research Matters
As cannabis legalization expands, preventing drugged driving becomes urgent. This review reveals that punitive legal approaches may be the least effective strategy, while information-based and behavioral interventions show more promise.
The Bigger Picture
The finding that legal sanctions have little impact on drug-related fatalities is striking and challenges the assumption that tougher laws automatically improve road safety. Education, testing, and behavioral interventions appear more effective, suggesting a public health rather than criminal justice approach may be warranted.
What This Study Doesn't Tell Us
Most studies focused on youth; applicability to older adults unclear. Heterogeneous interventions and outcome measures. Limited evidence on actual crash and fatality outcomes. Most studies measured knowledge and attitudes rather than behavior change.
Questions This Raises
- ?Why do legal sanctions fail to reduce drug-related fatalities?
- ?Would combining interventions (e.g., roadside testing with education) be more effective than single approaches?
- ?How can motivational interviewing be scaled for broader populations?
Trust & Context
- Key Stat:
- Legal sanctions: little effect on fatalities
- Evidence Grade:
- Systematic review with GRADE certainty ratings. Evidence strength varied by intervention type, with the strongest evidence for packaging warnings.
- Study Age:
- Published in 2021; drugged driving prevention research is rapidly evolving with cannabis legalization.
- Original Title:
- Interventions to Prevent Drugged Driving: A Systematic Review.
- Published In:
- American journal of preventive medicine, 61(2), 267-280 (2021)
- Authors:
- Razaghizad, Amir, Windle, Sarah B(4), Gore, Genevieve(2), Benedetti, Andrea, Ells, Carolyn, Grad, Roland, Filion, Kristian B, Eisenberg, Mark J
- Database ID:
- RTHC-03448
Evidence Hierarchy
Analyzes all available research on a topic using a structured method.
What do these levels mean? →Frequently Asked Questions
Do tough laws prevent drugged driving?
This review found very low to low certainty evidence that legal sanctions, including criminalization and per-se THC limits, have little or no effect on drug-related fatalities or injuries.
What actually works?
The strongest evidence supports cannabis packaging with health warnings (high certainty), roadside drug testing (moderate certainty), and motivational interviewing for youth (moderate certainty).
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Cite This Study
https://rethinkthc.com/research/RTHC-03448APA
Razaghizad, Amir; Windle, Sarah B; Gore, Genevieve; Benedetti, Andrea; Ells, Carolyn; Grad, Roland; Filion, Kristian B; Eisenberg, Mark J. (2021). Interventions to Prevent Drugged Driving: A Systematic Review.. American journal of preventive medicine, 61(2), 267-280. https://doi.org/10.1016/j.amepre.2021.03.012
MLA
Razaghizad, Amir, et al. "Interventions to Prevent Drugged Driving: A Systematic Review.." American journal of preventive medicine, 2021. https://doi.org/10.1016/j.amepre.2021.03.012
RethinkTHC
RethinkTHC Research Database. "Interventions to Prevent Drugged Driving: A Systematic Revie..." RTHC-03448. Retrieved from https://rethinkthc.com/research/razaghizad-2021-interventions-to-prevent-drugged
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.