6 Notable Drug Driving Cases That Were Dropped, and Why
A positive roadside swab or a laboratory result showing a driver was "over the limit" may make a prosecution seem inevitable. However, that is not necessarily the case. Drug driving charges depend on a sequence of forensic and procedural stages, including the roadside test, the blood sample, laboratory testing, and disclosure of the supporting evidence to the defence. If one part of that process breaks down, the prosecution may fail before a verdict is ever reached.
Drug Driving Solicitors has acted for clients in dozens of drug driving matters that concluded with discontinuance, dismissal, or acquittal. The following six cases come from the firm's own case history and illustrate the specific issues that caused each prosecution to fall apart.
1. The Officer's Account of the Roadside Test Was Inconsistent R v Lewis, Manchester Magistrates' Court [Case Dismissed, February 2023]
In Mr Lewis's case, the arresting officer stated that the roadside drug test displayed a "blue line" indicating cocaine. That description did not match the way the device actually records a positive result, which is shown by two red lines. Elsewhere in the officer's evidence, there were also contradictions about which drug had supposedly produced the positive result. These inconsistencies were brought out during cross-examination at trial. The prosecution then accepted that it could no longer establish that the roadside test had been positive, undermining the legal basis for requiring Mr Lewis to provide a blood sample. No further evidence was offered.
Why it matters: roadside testing and the officers responsible for documenting the results are open to challenge in the same way as other evidence. Even relatively small inconsistencies in an officer's description of the test can significantly weaken the prosecution's case.
2. The Blood Sample Was Too Small for Valid Testing R v CH, Bexley Magistrates' Court [Case Discontinued, November 2020]
Mr H arranged for part of his own blood specimen to be examined by an independent forensic toxicologist. The expert reached a clear conclusion: there was not enough blood in the sample to conduct a valid analysis. After that finding was presented to the Crown Prosecution Service together with a formal defence statement, the prosecution discontinued the case approximately one week before trial.
Why it matters: strict requirements apply to the quantity, handling, and division of blood specimens. Independent analysis of a defendant's own portion can reveal deficiencies that were not identified by the prosecution laboratory.
3. The Prosecution Failed to Meet Disclosure Deadlines Mr Sharpe [Case Discontinued, October 2018]
After Mr Sharpe pleaded not guilty, the court imposed a timetable requiring the prosecution to provide its forensic report and the material supporting it. That deadline passed without compliance. Further directions were issued at another hearing, but those deadlines were also missed. By the preliminary hearing, which took place only weeks before the scheduled trial, the required material still had not been provided. Rather than continue without its evidence properly in order, the prosecution discontinued the case.
Why it matters: the Criminal Procedure Rules impose genuine duties on prosecutors to serve evidence within the required timeframe. Repeated failures are not merely procedural details. Courts have refused to allow reliance on material disclosed too late, and that can prevent the prosecution from proving its case.
4. The Blood Result Was Below the Legal Limit R v Singh, Swindon Magistrates' Court [Case Discontinued, December 2022]
Mr Singh's blood specimen produced a result below the legal limit. Despite that, he was charged with the separate offence of driving while unfit through drugs, relying in part on statements he had made during a police interview several months later. Professor Atholl Johnston was instructed as an expert and concluded that the concentration detected in Mr Singh's blood did not correspond with the amount he had described taking and was unlikely to have had much effect on him. Together with a separate mistake in the hospital paperwork, that expert evidence ultimately led the prosecution to discontinue the case.
Why it matters: the fact that a charge has been brought does not establish that the evidence supports it. A result below the legal limit, combined with expert analysis of the likely effect of the detected level on a person's ability to drive, may expose weaknesses in a prosecution that initially appears stronger than it is.
5. A Medical Explanation Was Not Properly Evaluated R v Franklin, Cambridge Magistrates' Court [Case Discontinued, April 2022]
Mr Franklin faced a charge of failing to provide a specimen after informing the police that he suffered from a needle phobia. When a person identifies a possible medical reason for being unable to provide a sample, the law requires a medical professional to consider whether that condition amounts to a reasonable excuse. In Mr Franklin's case, no medical professional was brought in to carry out that assessment. An expert later reviewed his medical records, consulted with him, and confirmed that the phobia was genuine. In light of that evidence and the failure to obtain the required medical assessment, the prosecution discontinued the case before trial.
Why it matters: failing to provide a specimen does not automatically result in an offence being proved. Where a genuine medical reason exists, the police are expected to have it properly assessed. Failure to do so can seriously undermine the prosecution.
6. The Laboratory Lost the Necessary Accreditation During the Case R v LT, Llandudno Magistrates' Court (March 2021)
A number of the firm's cases were affected by the discovery that the laboratory responsible for testing blood samples had lost its UKAS accreditation for the particular testing required under section 5A of the Road Traffic Act 1988. In Mr T's case, the problem was identified only after the prosecution served its own analytical data pack and the defence examined it. Once it became clear that the laboratory no longer held the relevant accreditation, the reliability of the analysis itself was called into question. On the trial date, the prosecution sought an adjournment, but the court refused the request and no evidence was offered.
Why it matters: a report showing a result above the legal limit depends on the reliability and proper accreditation of the laboratory that produced it. If the laboratory was not accredited to carry out the required analysis, the reported figure may be incapable of supporting the prosecution in court.
What These Cases Have in Common
These six prosecutions were not abandoned simply because the police reconsidered their position. Each case involved a specific issue that could be demonstrated through evidence: inconsistent officer testimony, an inadequate blood sample, missed disclosure deadlines, a result below the legal limit, a medical reason that had not been properly assessed, or a laboratory without the necessary accreditation. In each example, the outcome depended on a defence team identifying the weakness and challenging it appropriately.
For anyone facing a drug driving allegation, the circumstances surrounding the stop, the handling of the sample, and the evidence supporting the charge may be more important than one figure appearing on a laboratory report. Consulting a specialist solicitor at an early stage can help determine whether any of these types of issues may also arise in an individual case.
This article provides general information only and should not be treated as legal advice. The outcome of every case depends on its particular facts.
