How much of a narcotic that has not been prescribed by a doctor are you permitted to have in your blood when driving?
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There is “zero tolerance of driving under the influence of narcotics.” (Driving Licence Book, 19th Edition, page 215)
There are exceptions, but they do not apply here, as the question specifies that the substance has not been prescribed by a doctor.
There is also a driving licence book online (2023).
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