Drug driving in EU Member States may be defined as impairment caused by drugs or having any trace of drugs in the blood (‘zero tolerance’), and some countries combine both definitions in a two-tier system
Is féidir tiomáint faoi thionchar drugaí a shainmhíniú mar lagú de bharr drugaí nó aon rian de dhrugaí san fhuil (‘neamhfhulaingt’), agus cuireann roinnt tíortha an dá shainmhíniú le chéile i gcóras dhá-chiseal