The Biggest Myths in Drink & Drug Driving Defence - And What Actually Matters
By MAJ Law on 20 April 2026
When someone is investigated for a drink or drug driving offence, one of the first things they tend to do is search online for answers. The problem is that much of what they find is either oversimplified, exaggerated, or in some cases, completely misleading. Over time, certain “myths” have become so widely repeated that they are often accepted as fact, even though they bear little resemblance to how these cases actually play out in practice.
At MAJ Law, we regularly speak to individuals who have already been told that their case will be “easy to get dropped”, that the police “must have made a mistake”, or that there is a technicality which will inevitably lead to the case collapsing. While these ideas can be reassuring in the moment, they often create unrealistic expectations and, more importantly, can lead to poor decision-making at a critical stage. The reality is that drink and drug driving cases are highly fact-specific, often technical, and rarely as straightforward as they are made out to be.
Myth 1: “Your case will be dropped before you even go to court”
One of the most persistent misconceptions is that a well-advised case will simply be discontinued before it ever reaches a plea stage. While it is true that some cases are withdrawn early, this is far less common than many are led to believe. In most drink and drug driving matters, the prosecution relies on a combination of forensic evidence, procedural compliance, and legal interpretation. Even where a potential issue is identified, it is rare for the prosecution to accept a defence position without careful scrutiny and, in many cases, resistance.
In practice, achieving an early discontinuance often requires sustained effort. This can include detailed written representations, formal requests for disclosure, and carefully constructed legal arguments, sometimes over multiple hearings. The criminal justice system itself is under considerable pressure, and prosecutors are not typically in a position to concede a case without being satisfied that there is a clear and irremediable flaw.
We have acted in cases where there were genuine evidential issues from the outset, such as failures to properly serve forensic material. In one such matter, the prosecution relied solely on an SFR2 without providing the underlying analytical data. Although this presented a strong line of challenge, the case was not immediately dropped. It required persistent engagement, formal legal argument under the Criminal Procedure Rules, and a willingness to push the issue before the prosecution ultimately discontinued proceedings. The key point is that even strong cases are rarely resolved overnight, and any suggestion to the contrary should be treated with caution.
Myth 2: “There’s always a technicality in the police procedure”
Another commonly repeated claim is that drink and drug driving cases are often won on “technicalities”, particularly in relation to police procedure and the MGDD (Manual of Guidance for Drink and Drug Driving). It is not unusual to hear that the police must follow a lengthy, rigid process and that any deviation from it will automatically invalidate a case. This is a misunderstanding of how the MGDD operates in practice.
The MGDD is, in essence, a structured set of guidance documents designed to assist officers in following the correct procedure. However, it is not a script that must be recited word-for-word, nor is every section applicable in every case. Many parts of the documentation are conditional, meaning that entire sections may be skipped depending on the circumstances. Additionally, some elements are included for officer guidance rather than as requirements that must be communicated to a suspect.
Where this myth becomes problematic is in the way it is sometimes used to suggest that a case is inherently flawed when, in reality, the alleged “error” may have no legal significance at all. At MAJ Law, we do examine procedural compliance carefully, including the use of MGDD documentation, but always within the context of the wider evidential picture. Not every mistake will undermine a prosecution, and not every case will contain one. A successful defence is rarely built on a single procedural point; it is usually the result of a detailed and holistic analysis of all available evidence.
Myth 3: “If it’s prescribed, you can’t be guilty of drug driving”
With the rise in medicinal cannabis prescriptions, this is an area where misunderstanding is becoming increasingly common. Many drivers assume that if a substance has been prescribed by a doctor, they are automatically protected from prosecution. Unfortunately, the legal position is more nuanced than that.
Under the Road Traffic Act 1988, specific limits are set for certain controlled drugs in the bloodstream, including THC. These limits are deliberately low and are not aligned with prescribed dosages or therapeutic use. As a result, it is entirely possible for someone to take medication exactly as directed, feel no impairment, and still exceed the legal limit when tested.
In these circumstances, the law provides what is commonly referred to as a “medical defence”. However, this defence is not automatic and does not apply simply because a prescription exists. It must be properly raised and supported with evidence, including confirmation that the medication was prescribed and taken in accordance with medical advice.
Importantly, while the prosecution is not required to prove impairment for an “over the limit” offence, the question of impairment can still become highly relevant when a medical defence is raised. In practice, this is often where cases are examined most closely, particularly where there is disagreement about the effect the medication may have had on the individual at the time of driving.
We have seen cases where individuals were genuinely surprised to find themselves facing prosecution despite acting in what they believed to be a responsible manner. For example, a driver may take prescribed cannabis in the evening, feel entirely fit to drive the following day, and yet still test above the legal limit. In those situations, the case does not simply turn on the existence of a prescription but on how the evidence as a whole is analysed and challenged.
In our view, this is an area where the law has struggled to keep pace with modern prescribing practices, and it continues to create uncertainty for drivers who are attempting to act responsibly while managing legitimate medical conditions.
Myth 4: “One solicitor should handle everything”
It is often assumed that the best approach is for a single individual to manage every aspect of a case, from initial preparation through to court advocacy. While this may appear efficient on the surface, it does not always reflect the practical realities of defending drink and drug driving allegations.
These cases typically involve two distinct areas of expertise. The first is detailed case preparation, which includes analysing evidence, identifying potential legal arguments, and developing a coherent defence strategy. The second is advocacy, which requires the ability to present that case effectively in court, respond to developments in real time, and engage persuasively with the tribunal. Both are critical, but they are very different skill sets.
At MAJ Law, we adopt a team-based approach that separates these functions. Your case is prepared by dedicated legal professionals who focus on the detail and strategy, while court hearings are conducted by experienced advocates who can concentrate fully on presenting the case. This ensures that nothing is overlooked behind the scenes, while also allowing for a high standard of representation in court. It also reflects the reality that when an advocate is in a hearing, their attention is necessarily focused on the case before them, and they are not in a position to simultaneously manage ongoing preparation or client communication.
The Bigger Issue: Unrealistic Expectations
Ultimately, the most significant risk posed by these myths is not simply that they are inaccurate, but that they shape expectations in a way that can be detrimental to the outcome of a case. Individuals who are led to believe that their case is straightforward may delay seeking proper advice, underestimate the seriousness of the situation, or commit to representation based on promises that are unlikely to be fulfilled.
We regularly speak to people who feel uncertain about the advice they have received or who are concerned that something does not quite add up. In some cases, they have already paid substantial upfront fees based on assurances that their case would be resolved quickly or easily. By the time they seek a second opinion, valuable time may already have been lost.
How to Approach Your Decision
If you are considering your options, it is important to take a step back and assess the information you are being given. Claims that sound too good to be true often are, particularly in an area of law that is as technical and fact-dependent as this. It is worth looking beyond headline promises and considering whether a firm can clearly explain the strengths and weaknesses of your case, rather than simply focusing on the potential positives.
Transparency, realism, and experience are key. A credible defence strategy should be grounded in evidence and tailored to the specifics of your case, not based on generic assumptions or unlikely outcomes.
Our Approach at MAJ Law
At MAJ Law, we focus on providing clear, honest advice from the outset. That means taking the time to understand the full circumstances of your case, identifying any viable lines of defence, and explaining the options available to you in a straightforward and realistic way. We do not promise quick wins or guaranteed outcomes, because in our experience, those promises rarely reflect the reality of how these cases are resolved.
What we do offer is a detailed, evidence-based approach, supported by a team with extensive experience in motoring law. Whether your case involves drink driving, drug driving, or a more complex evidential issue, our aim is to ensure that you are properly informed and in the best possible position to make decisions about how to proceed.
Still unsure?
If you are feeling uncertain about your situation, that is entirely understandable. Drink and drug driving cases can be stressful, technical, and difficult to navigate without clear guidance. That is why we offer free, no-obligation initial advice, with no time limit, so that we can fully understand your case and provide meaningful guidance from the outset.
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If you would like to explore how these cases are defended in practice, or discuss your own situation with our team, please get in touch.