Studies on drug prevalence in drivers published between 1999 and 2007 provide data for only 13 of the 27 EU Member States and Norway.
Ní sholáthraíonn staidéir ar leitheadúlacht drugaí i measc tiománaithe a foilsíodh idir 1999 agus 2007 ach sonraí le haghaidh 13 de 27 Ballstát an AE chomh maith leis an Iorua.