It is illegal to drive if your driving is impaired by drugs or if you have certain drugs above a specified level in your blood.
If the police stop you and think you’re on drugs they will either test you at the roadside using a drug screening device or a "Field Impairment" test to assess your ability to drive.
If drugs are detected in your system or you are deemed impaired by drugs, you’ll be arrested and taken to a police station for blood or urine tests. If the tests show you've taken drugs or show a specified drug above the specified blood limits you could be charged with drug driving.
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