Being charged with drink driving is one of the most serious and stressful experiences a motorist can face. The potential consequences—a mandatory driving ban of at least 12 months, a criminal record, and a massive increase in insurance premiums—are life-altering. Faced with a positive breathalyser reading, many drivers feel a sense of inevitability, believing that their case is indefensible and that a conviction is guaranteed.

This is a critical misunderstanding. A drink driving prosecution is one of the most technically complex and procedurally rigid in all of UK criminal law. The burden is not on you to prove your innocence; it is on the prosecution to prove, beyond a reasonable doubt, that every single step of a long and intricate procedure was followed perfectly by the police. A single error, omission, or deviation can render the entire case against you invalid. The crucial role of expert drink driving solicitors is to navigate this procedural minefield and identify these flaws. At Motoring Defence, this forensic analysis is our speciality.

The Roadside Stop and Preliminary Test

The process begins long before you arrive at the police station, and so does the opportunity for a legal challenge.

• The Reason for the Stop:The police are not entitled to stop vehicles at random simply to carry out breath tests. They must have a lawful reason to pull you over, such as witnessing a traffic violation, seeing evidence of erratic driving, or a defect with your vehicle. Alternatively, they may attend the scene of an accident. An unlawful stop can sometimes be challenged in court.
• The Preliminary Breath Test:Before requiring you to take a roadside breath test, an officer must have a reasonable suspicion that you have alcohol in your body. The handheld device they use is a screening tool only; its reading cannot be used as the primary evidence against you in court. However, failing the test or refusing to take it without a reasonable excuse provides the grounds for your arrest and is a crucial procedural step that must be conducted correctly.

The Critical Stage: The Police Station Procedure

This is where the majority of successful defences are found. Once you are arrested and taken to a police station, you will be required to provide an evidential sample of breath on a much larger, more sophisticated machine. The entire process of operating this machine and dealing with you is governed by a strict, near-verbatim script that the police officer must follow.

• The MGDDA Document:The officer's script is contained within a document known as the MGDDA (Manual of Guidance Drink and Drug Driving). This manual details the precise warnings that must be given, the questions that must be asked, and the information that must be provided to the suspect.
• Flawless Procedure is Required:The law requires that this procedure is followed to the letter. Any significant deviation can be fatal to the prosecution's case. For example, the officer must warn you that a failure to provide a sample is an offence, ask about any medical reasons you cannot provide a sample, and correctly operate the machine.

Expert drink driving solicitors will immediately request and forensically analyse the MGDDA pro forma that the police filled out in your case, along with the CCTV footage from the breathalyser room. We scrutinise this evidence for any procedural error that can be used to build your defence.

Blood and Urine Samples: A Different Set of Rules

In certain situations, the police may require you to provide a sample of blood or urine instead of breath. This might be because the evidential breathalyser machine is broken, unavailable, or you have a genuine medical reason (such as severe asthma) that prevents you from providing a breath sample.

This process is governed by its own equally strict set of procedures:

• Valid Medical Consent:You must be asked for your consent to take the sample, and this consent must be valid.
• Qualified Professional:The sample must be taken by a qualified and registered healthcare professional.
• Continuity of Evidence:The sample must be correctly sealed, stored, and transported to an accredited laboratory for analysis. Any break in this "chain of continuity" can render the evidence unreliable.

The scientific analysis of the sample itself can also be challenged. Specialist drink driving solicitors frequently instruct independent forensic scientists to review the laboratory's findings and procedures for any errors.

Motoring Defence: Your Procedural and Technical Experts

A drink driving case is won or lost on the fine details of legal procedure and scientific evidence. It requires a solicitor with a forensic, almost obsessive, attention to detail and a deep understanding of this highly specialised area of law. At Motoring Defence, our expert drink driving solicitors are masters of this complex field.

Our approach is to deconstruct the prosecution's case from the ground up:

• We demand and analyse every piece of evidence, from the arresting officer's statement and the MGDDA form to the breathalyser's calibration records and the CCTV footage.
• We are experts in the MGDDA procedure and the vast body of case law surrounding it. We know precisely what constitutes a fatal flaw in the prosecution's case.
• We build your defence on the solid ground of legal procedure, fighting to have cases dismissed and protecting your licence from the mandatory ban.

Don't Assume Guilt, Challenge the Process

A positive breath test is the beginning of the investigation, not the end of the story. The burden of proof is high, and the police must be held to the highest procedural standards. The expertise of specialist drink driving solicitors is your essential tool to ensure those standards are met.