Interest in the potential effect of drug use on vehicle crashes has been growing in North America, Europe, and Australia. However, the multiplicity of potentially impairing substances makes the study of drug effects on driving a far more difficult problem to deal with than alcohol.

 

 

This study was a part of a collaborative U.S./E.U. international research effort (Roadside Testing Assessment, ROSITA II) to assess illegal drug use among motor vehicle operators suspected of driving while under the influence of drugs and to evaluate the effectiveness of point-of-collection oral fluid drug detection technologies.