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Dominic Sellar

Drug Driving

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Section 4, Road Traffic Act 1988

It is an offence to drive or attempt to drive a motor vehicle whist unfit through drugs.   A person is unfit if their ability to drive is impaired as a consequence of taking drugs.  The impairment can be brought about from use of illegal drugs, legal highs and even prescription medication taken legitimately.  It also includes any other substance that causes impairment to a person’s ability to drive.

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"I firmly believe every motorist is entitled to expert road traffic advice"

  • We offer FREE confidential advice to all potential clients.
  • We provide an HONEST assessment of your situation.
  • We offer affordable FIXED fee pricing
  • We exclusively SPECIALISE in this area of the law

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facing a very difficult situation of a lengthy ban Dominic managed to fight my corner which resulted in a more manageable short term ban. What I liked about Dominic was that he was very straight talking and was very honest. … Continued

Careless Driving
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I was facing multiple charges and Dominic sorted Everything out. I’m absolutely delighted by the outcome. And would recommend him to anyone needing a road traffic lawyer.

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Speeding Driving Charge – 1st Class Service

Recently hired Dominic for a speeding charge I recieved. My experience was first class from start to finish upfront cost no hidden charges and communication from Dominic at all times was amazing only a phonecall away.

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Speeding Driving Charge – Falkirk JP Court

Many thanks for all your efforts in getting the speeding charge against me dropped.  I would have no hesitation in recommending the services of you and your firm.  From the outset you were very clear about the process and procedures … Continued

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Dangerous Driving. Dumfries Sheriff Court

I would like to express my gratitude to Mr Sellar for the way in which he represented me when faced with a dangerous driving charge or alternatively speeding charge. He came across as knowledgeable and professional with his advice that … Continued

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My brother recently used the services of Dominic Sellar & Co for a road traffic offence, and we’re very glad he did! The charges against him were dropped, in no small measure down to the expertise of Dominic. Wouldn’t hesitate … Continued

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Traffic Charges

I would like to thank Dominic and his team for a great outcome in court. I would highly recommend him to anyone facing traffic charges. His fee was also very reasonable.

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Speeding Charge

From the start to the end Mr Sellar came Cross as a highly intelligent man and it wasn’t until in the courtroom the real level of his intelligence and knowledge for road traffic law shone through. The end result is, … Continued

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Drink Driving & Failing to Provide at Edinburgh Sheriff Court

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Careless Driving Case, Hamilton Justice of the Peace Court

I would like to express my sincere thanks to you for the care and attention you showed to my mum when you recently represented her in court. This was an extremely anxious time for my mum and your professional yet … Continued

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Speeding and Careless Driving at Glasgow JP Court

Thank you for getting the very best result for me today. I truly appreciate the expertise and knowledge that you have and how this has enabled me to retain my very precious driving license. I will have no hesitation in … Continued

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Careless Driving and No Insurance at Lanark JP Court

Thank you so much for all your help and representation with my case at Lanark Sheriff Court. My license is essential, your expect advice and representation at trial saved my licence and my job. Thanks again, I would highly recommend … Continued

Careless Driving


The penalties for driving or attempting to drive whilst under the influence of drugs are similar to those of drink driving and include:

  • A fine of up to £5000; and
  • A minimum 12 month period of disqualification.
  • For serious contraventions of this offence a community based disposal or imprisonment can also be imposed.


A charge for driving whilst under the influence of drugs will usually arise because the police have reason to believe that your driving was impaired as a direct result of consuming drugs.  The law in this area allows the police to bring a charge in circumstances where an exact measurement of drugs in a person’s system cannot be made.

This type of offence frequently comes to light following an accident or where the police have stopped someone because of the manner of driving.  These particular factors may also ultimately support the contention that the driver was under the influence of something or other.


At present there is no universal device that can quickly determine if a driver has drugs, other than cannabis, in his system.  If the police think drugs have been taken the usual practice is to carry out a “Field Impairment Test”.  This requires a driver to perform a series of basic tests that might include simple balancing and counting exercises.

If, following these tests, the police have reasonable grounds to believe that you are unfit to drive because of drugs you will be arrested, taken to a police office and required to provide a sample of blood or urine.  The same requirement can be made if you are subsequently examined by a doctor who is of the opinion that you are under the influence of drugs.  A refusal or failure to provide such a sample is a separate offence of Failing to Provide a Specimen for Analysis.

The requirement for a blood or urine sample can also be made even where the driver has already provided two specimens of breath at a police office which are negative or below the legal limit of alcohol.  This might happen if the police initially thought that someone was under the influence of alcohol, rather than drugs or both.  If a sample of blood or urine is provided it will be sent to a forensic scientist for analysis to determine if any drug is present.  This usually takes a few weeks.


In all cases the prosecution must prove, beyond a reasonable doubt, that:

  • The driver was unfit through drugs; and
  • His driving was impaired

The prosecution must also prove that the police carried out all the procedures laid down by law.  Mistakes in the procedures may prove fatal and provide a defence to charges under this section.


The presence of drugs in your system does not automatically mean that a conviction will follow.  The prosecution must establish that the drug in question has impaired your ability to drive in some way.  This would be an area of focus for the defence to demonstrate that even where drugs have been taken this did not impair the ability to drive.

In some circumstances the defence may also present arguments that amount to what are called “Special Reasons”.  If Special Reasons are successfully made out before the court the penalties may be reduced and disqualification may be avoided altogether.  An example of Special Reasons in this type of case is where someone has been prescribed medication and is not aware of the effects this may have if taken with other medicines or a small amount of alcohol.

How we can help

As specialist road traffic lawyers we are best placed to give you the right advice. The law relating to drug and alcohol related offences is technical and complex. Our experience and expertise in this area will quickly determine the merits of the case and the best option for you. If there is no defence or the prospects of success are low we will tell you so and concentrate on damage limitation. We pride ourselves in offering a service that is friendly, reliable and honest. For free advice that is without pressure or obligation simply contact us:

E-Mail Us Today or Tel: 0141 255 1519

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