Majesty's Advocate v PK (High Court of Justiciary)

Factual and Procedural Background

The opinion concerns a reference by the Lord Advocate under section 123(1) of the Criminal Procedure (Scotland) Act 1995 concerning corroboration of sexual offences. Respondent was convicted after trial of ten charges, including eight charges of rape and sexual assault against two complainers. The Crown relied, among other evidence, on forensic evidence that sperm cells or semen attributable to Respondent had been found on vaginal and other swabs from Complainant A. [1][2][3][4]

Respondent had appealed against conviction, arguing that the trial judge had wrongly directed the jury that the forensic evidence could corroborate Complainant A’s account that she had been raped. Respondent abandoned that appeal shortly before it was due to be heard. The Lord Advocate nevertheless sought authoritative guidance on the interpretation and application of the law stated in Lord Advocate's Reference No 1 of 2023. [5][6]

The trial judge had directed the jury that scientific evidence of penetration, distress, recent statements, medical evidence, DNA evidence and other circumstances could provide corroboration on various charges. [7][8][9]

Legal Issues Presented

1. Whether forensic-scientific evidence of vaginal penetration by Respondent’s penis can corroborate a complainer’s account of rape. [10][11]
2. Whether forensic-scientific evidence of Respondent’s DNA on a complainer’s clothes or breasts can corroborate an account of sexual assault or assault with intent to rape. [12]
3. Whether any direct or circumstantial evidence of vaginal penetration can corroborate a complainer’s account of rape. [13]
4. Whether evidence that previously could corroborate only one element of a crime can, after Lord Advocate's Reference No 1 of 2023, corroborate the case that the crime was committed, subject to corroboration that Respondent committed it. [14][15]

Arguments of the Parties

Crown’s Arguments

• The reference raised no new principle beyond Lord Advocate's Reference No 1 of 2023, and corroboration should operate through clear, simple and non-technical rules. [16]
• It was the complainer’s account, rather than each separate element of the crime, that required corroboration. Corroborative evidence did not need to be more consistent with guilt than innocence and could be circumstantial or neutral when considered alone. [17][18]
• Evidence confirming penetration could support and confirm a complainer’s account of rape when considered together with the whole evidence. [17][19]
• The Crown relied on the principles concerning mixed statements, concurrence of testimony and circumstantial evidence in the authorities cited in its submissions. [17][20]
• The respondent’s proposed approach incorrectly isolated the corroborative evidence and wrongly required it to be independently incriminatory. [21][22]

Respondent’s Arguments

• The first three questions should be answered negatively; the fourth should be answered affirmatively but qualified so that the evidence must be capable, on at least one reasonable view of the whole evidence, of supporting an inference that the crime had been committed. [23]
• Evidence of penetration did not bear on absence of consent and therefore could not corroborate an account of rape. [23][24]
• Corroboration required proof that a crime had been committed and that Respondent had committed it. Evidence confirming only penetration was silent on whether rape had occurred. [25][24]
• The Crown’s approach would make proof of lack of consent depend essentially on the complainer’s word where penetration was admitted, reducing corroboration to a formality. [26]
• Medical evidence, distress, DNA, injury evidence and admissions could corroborate in particular circumstances where they permitted an inference of criminality, but evidence of consensual intercourse could not corroborate rape. [27][28]

Table of Precedents Cited

Court's Reasoning and Analysis

The court held that it was bound to apply the Full Bench decision in Lord Advocate's Reference No 1 of 2023, which it described as a cornerstone of modern Scottish evidence law. It declined to undertake a fresh analysis or consider other jurisdictions. [29][30]

The governing rule is that no person may be convicted on the testimony of one witness alone. The case against the accused must be corroborated in two respects: that the crime was committed and that the accused committed it. Separate elements of the crime do not each require independent corroboration. [59][60][61][62]

Circumstantial evidence need only confirm, support or fit with the principal evidence. It need not independently be incriminatory or more consistent with guilt than innocence. The evidence must be assessed in combination, rather than by artificially isolating the corroborative source. [63][64][65][66]

The court rejected Respondent’s argument that penetration evidence could not corroborate rape because it did not itself prove absence of consent. That argument would improperly reintroduce corroboration of separate elements, contrary to the Full Bench decision. [66][67]

The court reasoned that independent evidence of distress can corroborate the whole crime of rape even though distress alone does not establish intercourse. By the same logic, independent evidence of penetration can corroborate the whole account of rape when combined with the complainer’s evidence and supported by corroboration of identification. [54]

Where evidence proves that Respondent penetrated a complainer with his penis, it supports the complainer’s direct account of rape. The legal sufficiency requirement is then met, although the jury must still decide whether it accepts the evidence, whether the sources fit together, and whether guilt is proved beyond reasonable doubt. [68][69]

The same reasoning applies to DNA found on a complainer’s clothes or breasts and to an admission of sexual intercourse, including an admission forming part of a mixed statement. The jury may accept the incriminatory part if satisfied that the innocent explanation has been displaced. [70][53]

The court emphasised that corroboration remains a meaningful safeguard: there must be two independent sources, and the fact-finder must assess both the quantity and quality of the evidence. [71][72]

Holding and Implications

All four questions were answered in the affirmative, with the fourth qualified. Forensic evidence of vaginal penetration can corroborate an account of rape; DNA on clothes or breasts can corroborate an account of sexual assault or assault with intent to rape; any circumstantial evidence of penetration can corroborate an account of rape; and evidence previously capable of corroborating only one element may corroborate the fact that the crime was committed, provided that Respondent’s identity as the perpetrator is also corroborated. [31][73][74][75]

The direct effect was to provide authoritative guidance on the application of the modern Scottish law of corroboration. The court observed that cases in which penetration or sexual-assault evidence is the only corroborative source will be rare, because other forms of corroboration may commonly be available. [76][58][77]