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References on Drugs and Driving

CANNABIS AND ROAD SAFETY: AN OUTLINE OF THE RESEARCH STUDIES TO EXAMINE THE EFFECTS OF CANNABIS ON DRIVING SKILLS AND ON ACTUAL DRIVING PERFORMANCE

Dr G.B. Chesher

Department of Pharmacology University of Sydney and National Drug and Alcohol Research Centre University of New South Wales.

 


7. ALCOHOL AND CANNABIS IN EPIDEMIOLOGICAL STUDIES
The relative risk for drivers with alcohol plus cannabis was also greater than that for the control group, but this culpability ratio was no different from the alcohol only group. Also in this study (as indicated above), there was no significant difference in the BAC of the alcohol-only drivers and those with alcohol plus cannabis.
The same finding was reported by Terhune who also suggested that the high levels of alcohol are primarily responsible for the increased crash risk.
Therefore the effects of alcohol in road crashes are really profound. The studies reviewed here using the method of 'responsibility analysis' have confirmed the information already established by the case-control methods-that alcohol is the dominant drug associated with risky and dangerous driving and road crashes.
There have been suggestions throughout the studies reviewed here that the crash responsibility rates associated with the low BAC plus other drug, might be higher than in the low alcohol-only groups. The interaction of other drugs and alcohol (including cannabis) require further study using epidemiological techniques. One must remember the description by Perez-Reyes of the effect of the order of administration of alcohol and cannabis in these interaction studies.
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