Director of Public Prosecutions v Ratinskis (Approved)

Factual and Procedural Background

This was a direct appeal by the Appellant (the public prosecutor) from a High Court decision that had quashed the Respondent's conviction for an offence under s.4(2) of the Road Traffic Act 2010 (as amended) (referred to as “drunk driving”).

The Respondent was arrested by a member of the national police service shortly after 11 p.m. on 20 August 2022 after failing to provide a breath specimen at a mandatory checkpoint. He was taken to a police station where a designated doctor took a blood specimen at 12:37 a.m. The doctor divided the specimen into two bottles, sealed each within a container using numbered seals, and handed both containers to the police officer, who completed the statutory process under s.15. The Respondent took one sealed container when offered it; the remaining sealed container and the s.15 form were placed in a marked box, sealed, and posted to the Medical Bureau of Road Safety the following day.

The Medical Bureau issued an s.17 certificate (dated 29 August) stating a blood alcohol concentration of 126 mg per 100 ml (with the statutory maximum stated as 50 mg per 100 ml). The defence accepted that the s.15 form was duly completed and did not object at trial to admission of either the s.15 form or the s.17 certificate.

In the District Court, the Respondent sought a direction at the close of the prosecution case, arguing that there was an “invalidation” because the prosecution had not proved safekeeping/storage of the specimen between taking and posting. The District Judge rejected the submission (relying on statutory presumptions, absence of evidence of interference, sealing, and lack of defence cross-examination on custody) and convicted the Respondent, imposing a two-year disqualification and a €350 fine.

The Respondent did not appeal to the Circuit Court or pursue a case stated; instead, he initiated judicial review (April 2024). The High Court (Judge [Last Name]) held the District Court should have acquitted, concluding there was a legal requirement to prove chain of custody and that statutory presumptions did not fill the evidential “gap,” and further held judicial review was not inappropriate. The Appellant obtained unopposed leave for a direct appeal to the Supreme Court.

Legal Issues Presented

1. Whether there exists a legal requirement to prove a chain of custody for forensic samples, or whether it is a question of fact whether the analysed sample is the same as that obtained from the suspect.
2. Whether a ruling of law in the course of a criminal trial in the District Court can be subject to judicial review.

Arguments of the Parties

Appellant's Arguments

• The High Court erred in treating chain of custody for forensic samples as a legal requirement; the central question is whether the trier of fact can be satisfied as to identity and integrity, and any gap affects weight rather than admissibility.
• People (DPP) v. A. McD was said to be inapplicable (or not directly transposable) because this case falls within a detailed statutory regime (specimen taking, sealing, labeling, transmission) with express presumptions (s.15(4)) and evidential status for duly completed documents (s.20).
• The combined oral evidence of the police officer and the statutory documents (s.15 form; s.17 certificate) proved—absent evidence to the contrary—that the specimen analysed was the Respondent’s specimen; the defence carried an evidential burden to displace the presumptions and could not do so by pointing to absence of storage evidence alone.
• The statutory safeguards (seals, labels, matched serial numbers) were argued to be the means of protecting integrity; requiring oral chain-of-custody evidence would defeat the statutory purpose of avoiding calling each intermediary witness.
• Judicial review was argued to be inappropriate because alternative remedies existed and because sufficiency-of-evidence issues are generally for appeal; reliance was placed on authorities distinguishing appealable errors from jurisdictional unlawfulness.

Respondent's Arguments

• There was said to be a legal (and described as “statutory”) requirement to establish chain of custody “from the moment of recording until production in court,” and if not proven the evidence should be inadmissible.
• The statutory presumptions were argued not to cover the “in between” period after sealing and before arrival at the Bureau; the prosecution remained obliged to prove safe storage free from tampering.
• Although accepting the specimen itself was not “evidence,” the Respondent argued the s.17 certificate was inextricably linked to the specimen, such that unreliable custody rendered the certificate unreliable and inadmissible; an analogy was drawn with unlawfulness “contaminating” the process.
• Strict construction of penal statutes was relied upon (with reference to DPP v. Avadenei) to support the High Court’s interpretation that, without an express presumption, the prosecution must prove custody.
• Judicial review was defended as appropriate on the basis that a Circuit Court appeal would be de novo and allow the prosecution to “mend its hand,” and that the alleged District Court error was in excess of jurisdiction.
• The Respondent argued he could challenge admission of the certificate in judicial review despite not objecting at trial, because objecting earlier would have allowed the prosecution to cure the gap before closing its case.

Table of Precedents Cited

Precedent	Rule or Principle Cited For	Application by the Court
People (Director of Public Prosecutions) v. A. McD [2016] IESC 71, [2016] 3 I.R. 123	Requirements for establishing provenance/authenticity of CCTV footage; discussion of “accounting for history” to exclude interference; distinction between admissibility and weight.	The Supreme Court held A. McD did not create a general admissibility rule requiring full chain-of-custody proof for all “real evidence,” and did not support excluding evidence merely because of a gap; the case was also context-specific (CCTV and hearsay issues) rather than a statutory certificate regime.
DPP v. Avadenei [2017] IESC 77, [2018] 3 I.R. 215	Strict construction of penal statutes; focus on the effect of an identified defect.	The Supreme Court stated the High Court misread Avadenei as meaning any failure of strict compliance defeats the prosecution; the Court noted Avadenei ultimately held the particular defect there was of no consequence.
Power v. Hunt [2013] IEHC 174, [2013] 3 I.R. 709	Nature and effect/limits of certificate evidence in statutory regimes.	Cited by both sides; the Appellant relied on it to support that oral proof of matters covered by certificate/presumption is unnecessary. The judgment records it as part of the appellant’s supporting authorities.
DPP (Sergeant Moyles) v. Cullen [2014] IESC 7, [2014] 3 I.R. 30	Nature and effect/limits of certificate evidence in statutory regimes.	Cited by both sides; the Appellant relied on it to support the statutory purpose of certificate evidence. The judgment records it as part of the appellant’s supporting authorities.
Director of Public Prosecutions v. Walton (unrep., High Court, Morris P., ex tempore, 13th July 1998)	Statutory presumption covering forwarding of specimen; observations about chain-of-custody concerns in cases lacking the presumption.	Discussed as part of the High Court’s reasoning and as an appellant authority; the Supreme Court addressed chain-of-custody principles through later appellate discussion of related authorities.
Director of Public Prosecutions v. Whelan (unrep., High Court, O'Neill J., ex tempore, 2nd February 2009)	Consequences of evidential gaps regarding identification/provenance of physical items linked to certificate evidence.	The Supreme Court, citing People (DPP) v. Hawkins, stated Whelan is not authority for excluding evidence wherever there is any gap; the key is whether provenance is proven beyond reasonable doubt on the facts.
DPP v. Corrigan [1980] I.L.R.M. 145	Defence failing to displace statutory presumption (as cited by the Appellant).	Referred to as part of the appellant’s argument on evidential burden; the Supreme Court’s reasoning endorsed the need for more than mere suggestion to rebut statutory sufficiency.
DPP v. Collins [1981] I.L.R.M. 447	Evidential onus shifting to defence to show analysis could be falsified; mere suggestion is insufficient.	Relied on by the Supreme Court to emphasise that the defence must go beyond hypothesis and point to evidence undermining reliability/sufficiency of the statutory certificate.
Sweeney v. District Judge Fahy [2014] IESC 50	Distinction between unlawful errors amenable to judicial review and errors correctable on appeal.	Raised by the Appellant to argue judicial review was inappropriate for sufficiency-of-evidence challenges; the Supreme Court indicated the matter was better suited to a case stated than judicial review.
Lennon v. District Judge Clifford [1992] 1 I.R. 382	Limits on certiorari where proceedings are regular on their face and the tribunal had jurisdiction; misconstruction of statute not necessarily jurisdictional excess.	Raised by the Appellant; the Supreme Court noted that an alleged interpretive error does not necessarily imply jurisdictional excess and is more suited to case stated.
People (DPP) v. Hawkins [2014] IECCA 36	Interpretation of Whelan; chain of evidence is not “mathematical certainty” and not every handler must be called; focus is proof beyond reasonable doubt.	Applied by the Supreme Court to rebut the proposition that any custody gap mandates exclusion; gaps go to whether the court can be satisfied beyond reasonable doubt on provenance/identity.
R v. Robson & Harris	Referenced in A. McD regarding accounting for history to exclude interference; tape recordings and issues of provenance/originality and authenticity.	The Supreme Court used the discussion to illustrate that chain-of-custody concerns relate to fact-finding and weight, and that challenges must be properly raised rather than assumed at the close of the prosecution case.
AB v. The Chief IPO [2026] IESC 23	Recent discussion of judicial review (mentioned for fuller consideration).	Not analysed in detail; referenced as a source for broader discussion, which the Court said was unnecessary to address fully on its conclusions.
LA v. The Chief Appeals Officer and Others [2026] IESC 22	Recent discussion of judicial review (mentioned for fuller consideration).	Not analysed in detail; referenced as a source for broader discussion, which the Court said was unnecessary to address fully on its conclusions.

Court's Reasoning and Analysis

The Supreme Court rejected the foundational propositions underpinning the High Court’s approach, stating that each was incorrect.

(1) The specimen was not “evidence” in court. The Court held that specimens taken under the Act are not adduced in court; they are analysed. The evidence is the s.17 certificate, which is admissible only because the Act makes it admissible and sets conditions for admissibility (prescribed form; “duly completed”).

(2) Distinguishing admissibility from weight/sufficiency under the statute. The Court explained that an argument about custody/integrity is properly directed to whether the certificate should be treated as “sufficient evidence” of its contents “until the contrary is shown.” That is a question of weight/sufficiency under the statutory scheme, not a free-standing admissibility objection. Under the Act, it is for the defence to raise and support (by evidence or by reliance on prosecution evidence) reasons to doubt the certificate’s correctness.

(3) No general legal rule requiring chain-of-custody proof as a condition of admissibility. The Court held there is no general rule that a chain of custody must be proven for “real evidence” in all cases, and emphasised that “real evidence” is used in different senses. The Court further held that A. McD did not purport to establish any such universal admissibility rule.

(4) Proper understanding of A. McD. The Court described A. McD as a case about whether CCTV footage was hearsay and what was needed to establish provenance/authenticity; it also recognised challenges to admissibility on normal exclusionary grounds. The Court stated that references in A. McD to “accounting for history” related to excluding the possibility of interference as a matter for the fact-finder and did not mean that any failure to prove a chain of custody necessarily renders evidence inadmissible.

(5) Statutory scheme safeguards identity and integrity. The Court examined the contents of the s.15 form and s.17 certificate and concluded they link the analysed specimen to the Respondent through matching particulars and the statutory structure: the s.17 certificate certifies analysis of “the specimen to which the above particulars relate,” and a certificate under s.17 relates to a specimen forwarded under s.15, i.e., one bottled, labelled, and sealed. The Court also reasoned that sealing/serial-number matching is an essential safeguard, and suggested that tampering would prevent the Bureau from being able to certify it was “the” specimen matching the particulars, given the seal characteristics described.

(6) Role of presumptions and the defence obligation to do more than speculate. Looking at the statutory scheme as a whole (procedures, certificate evidence, presumptions of compliance), the Court concluded that it is for the defence to raise exclusionary-rule admissibility objections, or to raise reliability concerns with evidential support. The Court noted the possibility of analysing the second bottle as a means of challenging identity/integrity. The Court reiterated orthodox principles that the prosecution need not exclude every hypothetical possibility consistent with innocence and relied on Collins to reject mere speculation that something “might” have gone wrong.

(7) Misreading of Avadenei. The Court held the High Court was wrong to treat Avadenei as requiring the prosecution to fail upon any strict-compliance shortfall; it stated that Avadenei focused on the effect of the identified defect and held the defect there was of no consequence.

(8) Judicial review. The Court stated that, given its conclusions, it was unnecessary to consider the judicial review issue in detail. It nevertheless expressed a firm view that the case was not suitable for judicial review: the trial application was essentially about the sufficiency of the prosecution case, and the alleged interpretive error did not necessarily mean the District Judge exceeded jurisdiction; the matter was described as more suited to a case stated than to judicial review.

Holding and Implications

ALLOWED: The Supreme Court allowed the Appellant’s appeal.

The practical effect was to overturn the High Court’s decision that the Respondent should have been acquitted on the basis of an unproven “chain of custody” gap. The Court’s analysis emphasised that, within the statutory regime for specimen certificates and presumptions, speculative assertions of possible interference do not, without evidential support, displace the statutory “sufficient evidence” status of a duly completed certificate. The judgment did not state any broader implications beyond clarifying the distinction between admissibility and weight/sufficiency in this statutory context and indicating that such disputes are generally more appropriate for appeal mechanisms (such as case stated) rather than judicial review.