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The Crime and Courts Act 2013 created a new limit based offence of drug driving by inserting a new section 5A in the Road Traffic Act 1988.  Under the Act, a driver can be convicted if “the proportion of the drug in” his or her “blood or urine exceeds the specified limit for that drug”.

Drug Driving

Since the 10th April 2015 drivers can be arrested for “drug driving” with various drugs being given their own limit.  If the proportion of the drug in his or her blood or urine exceeds the specified limit for the prescribed drug you will be charged and should seek legal advice.

The police and CPS showed some reluctance in pursuing this offence under the old law owing to difficulties with showing impairment as a result of the drug.  The new offence works much like the drink drive laws and has shown a massive spike in the procedure being used and prosecutions.  Arrests for this offence have increased in the order of 800% in some forces so this is a very real issue for many motorists.

The penalties are very similar for drink driving with a mandatory disqualification of 12 months as a starting point.  If you have any questions or need advice please contact us or email:

Drug limits:

Illicit drugs

  • Benzoylecgonine, 50 µg/L
  • Cocaine, 10 µg/L
  • Delta–9–Tetrahydrocannabinol (Cannabis and Cannabinol), 2 µg/L
  • Ketamine, 20 µg/L
  • Lysergic Acid Diethylamide (LSD), 1 µg/L
  • Methylamphetamine – 10 µg/L
  • Methylenedioxymethaphetamine (MDMA – Ecstasy), 10 µg/L
  • 6-Monoacetylmorphine (6-MAM – Heroin and Morphine), 5 µg/L

Generally Prescription Drugs

  • Clonazepam, 50 µg/L
  • Diazepam, 550 µg/L
  • Flunitrazepam, 300 µg/L
  • Lorazepam, 100 µg/L
  • Methadone, 500 µg/L
  • Morphine, 80 µg/L
  • Oxazepam, 300 µg/L
  • Temazepam, 1000 µg/L

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