Are you ever permitted to drive with narcotics in your blood?
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It is forbidden to drive if “your blood contains any substance classed as a narcotic. This does not apply if the medication has been prescribed by a doctor.” (Driving Licence Book, 19th Edition, page 213)
Note however that you may not drive if you are a danger in traffic, meaning that:
There is also a driving licence book online (2023).
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