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Cannabis and its effects on driving skills
Percy Bondallaz1, Bernard Favrat2, Haïthem Chtioui3
1Traffic Medicine and Psychology Unit, University Center of Legal Medicine, University Hospital of Geneva, Rue Gabrielle-Perret-Gentil 4, 1205 Genève, Switzerland.
Forensic Science International
|October 5, 2016
Summary
Cannabis use impairs driving ability, affecting psychomotor functions and cognitive skills, even long-term. Blood tests are crucial for assessing impairment and chronic use in drivers.
Area of Science:
- Neuroscience
- Forensic Toxicology
- Traffic Safety
Background:
- Cannabis is frequently detected in impaired drivers, raising concerns amid marijuana legalization.
- Neurobiological effects of cannabis on driving safety are not fully understood.
- Cannabis impairs psychomotor functions critical for safe driving.
Purpose of the Study:
- To review the acute and long-term effects of cannabis on driving performance and cognitive functions.
- To understand the neurobiological mechanisms of cannabis-impaired driving.
- To evaluate methods for detecting cannabis impairment in drivers.
Main Methods:
- Literature review of laboratory, simulator, and on-road driving studies.
- Analysis of structural and functional brain imaging studies.
- Examination of blood, oral fluid, hair, and urine analyses for THC detection.
Main Results:
- Cannabis use impairs driving by increasing lane weaving and headway distance.
- Dose-dependent cognitive and psychomotor impairments persist weeks after cessation.
- Combined alcohol and cannabis use significantly increases error rates.
- Blood sampling is effective for assessing acute impairment and chronic use.
Conclusions:
- Cannabis significantly impairs driving performance and cognitive functions.
- Long-term cannabis use may indicate addiction and unfitness to drive.
- Blood tests are the most effective method for evaluating cannabis impairment in drivers.
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