The Story Behind 6 Drug Driving Cases That Were Dropped
A positive roadside swab or a laboratory finding showing a driver "over the limit" can make a prosecution appear settled from the outset. However, that is not necessarily the case. Drug driving prosecutions depend on a sequence of forensic and procedural stages, including the roadside test, blood collection, laboratory analysis, and disclosure of the supporting evidence to the defence. If one of those stages is defective, the prosecution may fall apart 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 following six cases come from the firm's own case history and illustrate the particular issue that caused each prosecution to fail.
1. A Medical Explanation Was Not Properly Investigated 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. The law requires a possible medical explanation for failing to provide a sample to be assessed by a medical professional to determine whether it amounts to a reasonable excuse. In this case, however, no medical professional was brought in to carry out that assessment. An expert report based on Mr Franklin's medical records and a consultation with him later confirmed that his phobia was genuine. In light of that evidence and the procedural failure in the case, the prosecution discontinued proceedings before trial.
Why it matters: a charge of "failure to provide" does not automatically establish an offence. Where a genuine medical reason exists, police must ensure that it is properly assessed. Failing to do so may significantly weaken the prosecution's case.
2. The Arresting Officer's Account Could Not Withstand Scrutiny 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 displayed a "blue line" for cocaine. That description did not correspond with the way a positive result appears on the device, since a genuine positive produces two red lines. Elsewhere in the same account, the officer also gave contradictory information about which drug had supposedly produced the positive result. Cross-examination at trial exposed those inconsistencies. 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 been requested. No further evidence was offered.
Why it matters: both roadside testing and the evidence recorded by the officers administering those tests are open to challenge. Even apparently minor inconsistencies in an officer's description of a result can become significant enough to undermine the prosecution.
3. The Blood Sample Was Too Small 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: the available sample did not contain enough blood to permit 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 a week before trial.
Why it matters: strict requirements apply to the quantity, handling, and division of blood specimens. Having the defendant's own portion independently examined may reveal defects that were not identified by the prosecution laboratory.
4. The Laboratory Lost the Required Accreditation During the Case R v LT, Llandudno Magistrates' Court (March 2021)
A number of cases handled by the firm 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 identified only after the prosecution served its analytical data pack and the material was reviewed. Once it became clear that the relevant accreditation had been lost, the reliability of the laboratory analysis was called into question. The prosecution sought an adjournment on the trial date, but the court refused the request, and no evidence was offered.
Why it matters: an "above the limit" laboratory result depends on the reliability and proper accreditation of the laboratory responsible for producing it. Where the laboratory lacked the necessary accreditation for the test, the reported figure may not withstand scrutiny in court.
5. The Blood Result Fell 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 specimen was reported as being below the legal limit, but he was nevertheless charged with the separate offence of driving while unfit through drugs. That allegation relied in part on statements he had made during a police interview conducted 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 what he had described taking and was unlikely to have had much effect on him at all. Together with a separate mistake in the hospital paperwork, that expert evidence contributed to the prosecution eventually discontinuing the case.
Why it matters: the fact that a person has been charged does not mean the available evidence necessarily proves the allegation. A below-limit finding, combined with expert analysis of what the detected concentration would realistically mean for driving ability, can expose weaknesses in a prosecution that initially appears stronger.
6. Repeated Disclosure Deadlines Were Missed by the Prosecution Mr Sharpe [Case Discontinued, October 2018]
After Mr Sharpe pleaded not guilty, the court established a timetable requiring the prosecution to provide its forensic report and the material supporting it. The first deadline passed without compliance. At a later hearing, additional directions were made, but those requirements were also not met. When the matter reached a preliminary hearing only weeks before the scheduled trial, the prosecution had still failed to comply with the disclosure timetable. Rather than continue without its evidence properly in order, the prosecution discontinued the case.
Why it matters: the Criminal Procedure Rules impose genuine disclosure duties on the prosecution, including requirements concerning when evidence must be provided. Persistent failures are not merely technical defects. Courts have repeatedly prevented prosecutors from relying on evidence served too late, and that can leave a case unable to proceed.
What These Cases Have in Common
None of these six prosecutions ended because the police simply "changed their mind." Each outcome arose from an identifiable and demonstrable problem: a medical reason that was never properly assessed, unreliable officer evidence, an inadequate blood sample, a laboratory without the necessary accreditation, a result inconsistent with the charge, or repeated failures to comply with disclosure deadlines. In each matter, the issue had to be identified and challenged by a defence team that understood where weaknesses in the evidence might be found.
For anyone facing a drug driving allegation, the circumstances surrounding the stop, the collection and handling of the specimen, and the evidence supporting the charge may be considerably more important than one figure appearing on a laboratory report. Obtaining advice from a specialist solicitor at an early stage can help determine whether similar evidential or procedural problems exist in a particular case.
This article provides general information only and should not be treated as legal advice. The outcome of every case depends on its individual facts.
