Correct answer: C. Yes, they can check at any time.
It is against the law to drive a car, motor bike, truck, bus, pedal bike or an animal-drawn vehicle while "under the influence of an intoxicant to such an extent as to be incapable of having control of the vehicle". Intoxicants include alcohol and drugs, whether taken separately or together. The word "drugs" here includes legal prescribed and over-the-counter (OTC) medicines.
This is an official-style question from the Safe and Responsible Driving topic of the Ireland driver theory test (Cat. B). Practise all 807 questions free on iTest.ie — with timed mock exams, automatic mistake tracking and progress sync across devices.
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