Driving under the influence of drugs other than alcohol has gained considerable attention during the recent years. Increased prevalence of non-alcohol drugs among apprehended and accident drivers have been reported from several countries (Seymore and Oliver, 1999; Christophersen 2000; Logan and Schwilke, 2004; Drummer et al., 2004; Brevik et al., 2004; Morland, 2004; www.fhi.no). Studies and discussion of accident risks caused by the different illegal and psychoactive medicinal drugs have been in progress for a long time without any conclusion. Several review articles have been published during recent years (Morland, 2000; Kelly et al., 2004). One problem may be connected to the facts that results from different epidemiological studies (case control, responsibility analyses, and descriptive analytical studies) are inconclusive.
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