Canadian researchers of the University of Victoria investigated the question whether clients in treatment for problems related to the use of alcohol, cannabis, cocaine, or various combinations of these substances, had a higher risk to drive while impaired compared to a control group.

445 drivers under treatment were included. In the 8 years before treatment, every drug group except the "cannabis only" group had significantly more convictions for driving while impaired than controls.

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Source: Macdonald S, et al. Traffic Inj Prev 2005;6(3):207-11.