Carter v Director of Public Prosecutions

Factual and Procedural Background

The Appellant was stopped by the police while driving on 2 April 2003 and gave a positive roadside breath test. He was arrested and taken to a police station where a substantive breath test was conducted by a police sergeant. The Appellant provided two breath samples, with the lower reading being 49 micrograms of alcohol per 100 millilitres of breath. Exercising a statutory option, the Appellant chose to replace the breath samples with a blood sample, which was taken by a police surgeon. The blood analysis showed not less than 93 milligrams of alcohol per 100 millilitres of blood after applying a standard deduction.

The Appellant was charged under the Road Traffic Act 1988 and was convicted by the District Judge at trial. The prosecution evidence included testimony from the police sergeant who conducted the breath procedure and a forensic scientist who analyzed the blood sample. There was also an agreed statement regarding the lawful arrest of the Appellant following the positive roadside breath test and a statement from the medical practitioner who took the blood sample.

The Appellant gave evidence claiming limited alcohol consumption that evening, supported by a partner's testimony and a chemist's expert report suggesting no alcohol would remain in the body by the time the blood sample was taken if the Appellant's account was accurate. The District Judge rejected this evidence and convicted the Appellant.

Pre-trial discussions involved clarifications on the issues to be tried, focusing on the procedures at the police station and the accuracy of the blood analysis. The Appellant did not cross-examine the police sergeant on the blood sampling process, and the medical practitioner did not give evidence. The forensic scientist acknowledged that absence of preservative in the blood sample vial could affect the accuracy of the analysis, but it was not standard practice to test for preservative presence.

The District Judge found that the prosecution proved the case beyond reasonable doubt, relying on procedural compliance, the blood analysis, and rejecting the Appellant’s account of alcohol consumption.

Legal Issues Presented

1. Whether the District Judge misdirected herself in law by relying on a presumption that preservative was present in the blood sample vial absent evidential challenge.
2. Whether the District Judge was entitled to consider the positive roadside breath test reading, which was statutorily excluded from evidence, as part of her assessment of the Appellant’s credibility.

Arguments of the Parties

Appellant's Arguments

• The prosecution must prove beyond reasonable doubt that the blood sample was reliable, which requires proof that preservative was present in the vial; absence of such proof creates doubt and entitles the Appellant to acquittal.
• The District Judge erred in relying on the positive roadside breath test reading, which Section 8(2) of the Road Traffic Act 1988 prohibits from being used as evidence once the blood sample option is exercised.
• Reliance on the breath test reading breaches the statutory prohibition and relevant case law, including Smith v Geraghty and Yhnell v Director for Public Prosecutions.

Court's Submissions and Reasoning

• The prosecution is entitled to rely on a presumption that the blood sample kit was prepared correctly, including the presence of preservative, unless the defence adduces evidence to the contrary.
• The approach aligns with prior authority, including Dhaliwal v Director of Public Prosecutions, where proof of preservative presence was not required absent evidential challenge.
• The use of the roadside breath test reading by the District Judge was limited to assessing the Appellant’s credibility and did not constitute reliance on the breath test as evidence of guilt, thus not breaching Section 8(2).
• The statutory language and relevant case law support that the breath test reading remains admissible for purposes other than proof of guilt, such as credibility assessment.

Table of Precedents Cited

Court's Reasoning and Analysis

The court analyzed the two central issues by applying established legal principles and relevant case law. Regarding the presumption of preservative presence, the court emphasized that the prosecution need not prove the presence of preservative unless the defence adduces evidence to create a doubt about the sample’s reliability. This approach prevents unnecessary technicalities that would complicate prosecutions and is consistent with the opportunity afforded to defendants to have independent analysis of samples.

On the second issue, the court interpreted the statutory prohibition on using the lower breath specimen reading (Section 8(2) of the Road Traffic Act 1988) in context. It concluded that the District Judge’s reference to the breath test was solely for assessing the Appellant’s credibility, not as evidence of guilt or to support the blood sample analysis. The court found this use proper, relevant, and admissible, aligning with prior judicial interpretations that allow some evidential use of the breath test reading in procedural or credibility contexts.

The court rejected the Appellant’s arguments on both issues, finding no misdirection in law or unreasonable decision-making by the District Judge.

Holding and Implications

The court DISMISSED THE APPEAL, upholding the conviction of the Appellant for the offence of driving with excess alcohol in the blood.

The decision confirms that in drink-driving cases, courts may presume the proper preparation of blood sample kits absent evidential challenge, including the presence of preservative, thereby not requiring the prosecution to prove this fact affirmatively. It also clarifies that statutory prohibitions on using certain breath test readings do not preclude their use in assessing witness credibility or procedural compliance. No new precedent was set beyond affirming established principles and their correct application in this context.