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
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.