Thresholds For Prosecution Of Illegal Drug Use While Driving

If you take legally prescribed drugs it is your responsibility to speak with your GP or consultant and follow their advice about driving. Police advise you keep evidence with you of your prescription when driving.

It’s fine to drive when taking prescription drugs if you’re following your doctor’s advice and you’re not impaired.

The measurement of drugs is conducted in microgrammes per litre of blood. A microgramme is one millionth of a gramme.

 

This the list of thresholds for prosecution for illegal drugs:

benzoylecgonine  

(metabolite of cocaine)

50µg/L
cocaine 10µg/L
delta-9-tetrahydrocannabinol  

(cannabis)

2µg/L
ketamine 20µg/L
lysergic acid diethylamide  

(LSD)

1µg/L
methylamphetamine  

(crystal meth)

10µg/L
Methylenedioxymethamphetamine  

(MDMA/ecstasy)

10µg/L
6-monoacetylmorphine  

(heroin)

5µg/L
List of thresholds for ‘medicinal’ drugs:  
clonazepam 50µg/L
diazepam 550µg/L
flunitrazepam 300µg/L
lorazepam 100µg/L
methadone 500µg/L
morphine 80µg/L
oxazepam 300µg/L
temazepam 1,000µg/L
   
amphetamine 250µg/L

Separate approach (to balance its risk against legitimate use and abuse)

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