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Published on: May 30, 2025
Cannabis and Driving: Developing Guidelines for Safety Policies.
Federico Manetti1, Silvio Chericoni2, Anna Marrocco3
1Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, Rome, Italy.
Driving under the influence of cannabinoids is debated due to regulatory changes. A quantitative tetrahydrocannabinol (THC) cut-off is recommended for impaired driving policies.
Area of Science:
- Forensic Toxicology
- Cannabinoid Pharmacology
- Road Safety
Background:
- Cannabinoid regulation is dynamic, impacting cognitive and psychomotor skills.
- Impairment of driving skills is a key concern for public safety.
Purpose of the Study:
- To analyze the effects of cannabinoids on driving skills.
- To evaluate current regulatory policies for driving under the influence of cannabinoids.
Main Methods:
- Review of scientific literature on cannabinoid effects on driving.
- Analysis of pharmacokinetic data and metabolite presence.
- Examination of different regulatory policy models.
Main Results:
- Cannabinoids and metabolites show prolonged positivity in biological fluids, especially with chronic use.
- Tetrahydrocannabinol (THC) concentration affects driving automatisms, while cognitive skills remain intact at higher doses.
- Uncertainty remains regarding combined substance use, chronic consumption, and other cannabinoids.
Conclusions:
- A quantitative tetrahydrocannabinol (THC) cut-off between 3.5-5 ng/ml is the most balanced regulatory approach.
- Identified pitfalls in scientific and legislative fields require improvement for enhanced safety policies.
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