6 Drug Driving Charges Withdrawn and the Explanations Behind Them
A positive roadside swab or a laboratory finding showing a driver was "over the limit" may make a prosecution seem conclusive. However, that is not necessarily the case. Drug driving proceedings depend on a sequence of forensic and procedural stages, including the roadside test, collection of the blood sample, laboratory examination, and disclosure of the resulting 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 through discontinuance, dismissal, or acquittal. The six examples below come from the firm's own case history and illustrate the particular issue that caused each prosecution to fall apart.
1. 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 police that he suffered from a needle phobia. When a person identifies a potential medical reason for being unable to provide a sample, the law requires a medical professional to assess whether that reason constitutes a reasonable excuse. In Mr Franklin's case, however, no medical professional was brought in to carry out that assessment. An expert report based on his medical records and a consultation with him later confirmed that the phobia was genuine. In light of that evidence and the procedural omission, the prosecution discontinued the case before trial.
Why this is significant: a charge of "failure to provide" does not automatically amount to an offence. Where a genuine medical reason is raised, the police must ensure that it is properly assessed. Failing to do so may substantially weaken the prosecution's case.
2. Disclosure Deadlines Were Repeatedly Missed by the Prosecution: 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 supporting material. That deadline passed without compliance. At a later hearing, the court issued additional directions, but those were missed as well. By the preliminary hearing, which took place only weeks before the trial date, the prosecution had still failed to meet its disclosure obligations. Rather than continue without its evidence properly in order, the case was discontinued.
Why this is significant: the Criminal Procedure Rules impose genuine requirements on prosecutors to provide evidence within the deadlines set by the court. Repeated non-compliance is more than a minor procedural issue. Courts have refused permission for late evidence to be relied upon, and that can prevent a prosecution from continuing successfully.
3. The Arresting Officer's Account Could Not Withstand Examination: R v Lewis, Manchester Magistrates' Court [Case Dismissed, February 2023]
In Mr Lewis's case, the arresting officer stated that the roadside drug test had produced a "blue line" indicating cocaine. That description did not match the way the device displays an actual positive result, which is shown by two red lines. Elsewhere in the same evidence, the officer also gave conflicting information about which drug had supposedly produced the positive result. Those discrepancies became clear 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 on which the blood sample had originally been demanded. No additional evidence was presented.
Why this is significant: both roadside testing and the police evidence documenting those results can be questioned in the same way as other evidence. Even apparently minor inconsistencies in an officer's description of a test may become important enough to undermine the prosecution.
4. The Testing Laboratory Lost Its Accreditation During the Proceedings: 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 analysing 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 issue was not identified until the prosecution served its own analytical data pack and the material was examined. Once it became clear that the relevant accreditation had been lost, questions arose over the reliability of the entire analysis. On the scheduled trial date, the prosecution applied for an adjournment. The court declined that application, after which no evidence was offered.
Why this is significant: an "above the limit" reading depends on the reliability of the laboratory responsible for producing it. If the laboratory did not hold the appropriate accreditation for the required analysis, the reported result may not withstand scrutiny in court.
5. The Blood Reading Was Below the Legal Limit: R v Singh, Swindon Magistrates' Court [Case Discontinued, December 2022]
Mr Singh's case involved an unusual set of circumstances. His blood sample produced a result below the legal limit, yet he was still prosecuted for the separate offence of driving while unfit through drugs. Part of that allegation relied 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 identified in Mr Singh's blood did not correspond with the amount he had described taking and was unlikely to have affected him significantly. Together with a separate mistake in the hospital paperwork, that expert evidence ultimately led the prosecution to discontinue the case.
Why this is significant: the fact that a charge has been brought does not mean the available evidence necessarily proves it. A blood result below the prescribed limit, combined with expert assessment of what the detected level would realistically mean for driving ability, can expose weaknesses in the basis of the allegation.
6. The Sample Did Not Contain Enough Blood for Valid Testing: R v CH, Bexley Magistrates' Court [Case Discontinued, November 2020]
Mr H provided part of his own blood specimen to an independent forensic toxicologist for examination. The expert reached a clear conclusion: there was not enough blood in the specimen 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 the scheduled trial.
Why this is significant: strict requirements apply to the quantity, handling, and division of blood specimens. Having a defendant's own portion independently examined can reveal defects that were not identified by the prosecution laboratory.
What These Cases Have in Common
These six prosecutions did not end because the police simply "changed their mind." Each outcome arose from a specific issue that could be demonstrated through evidence: a medical explanation that had not been properly assessed, repeated failures to meet disclosure deadlines, inconsistent police evidence, a laboratory that lacked the necessary accreditation, a result that did not support the allegation, or a sample that was insufficient for valid analysis. In each instance, identifying the problem depended on a defence team knowing which parts of the evidence and procedure required close examination.
For anyone facing a drug driving allegation, the circumstances surrounding the stop, the way the specimen was obtained, and the evidence supporting the charge can be considerably more important than a single figure appearing on a laboratory report. Consulting a specialist solicitor at an early stage can help determine whether similar evidential or procedural issues may be relevant to the case.
This material is provided for general informational purposes and should not be treated as legal advice. The outcome of every case depends on its individual facts.