Chibuwe Muvengwa v The State

The accused was convicted of rape in contravention of s 65 read with s 64(1) of the Criminal Law (Codification and Reform) Act and sentenced to 10 years imprisonment with 3 years suspended (effective 7 years). The complainant was subjected to a mental health assessment by a mental health nurse in terms of s 278(3a) of the Criminal Procedure and Evidence Act. The mental health nurse concluded that the complainant had mild mental sub-normality and was 'incapable of giving sound evidence in court'. The assessment noted evidence of mild intellectual ability, delayed developmental milestones (started walking and talking at age 5, only attended school to grade 2), though memory was intact. Despite this conclusion, the trial magistrate accepted the complainant's evidence, noting she gave evidence 'very well' and was corroborated by other witnesses. The matter came before the High Court on criminal review.

• Whether a complainant deemed mentally incompetent to give evidence by expert assessment can testify in criminal proceedings
• Whether the trial magistrate erred in accepting evidence of a complainant whom a mental health expert concluded was incapable of giving sound evidence without calling the expert to testify
• The proper application of s 246 of the Criminal Procedure and Evidence Act regarding incompetency from mental disorder or defect
• Whether expert medical evidence should be led to clarify apparent inconsistencies in a mental health assessment report

1. The conviction and sentence are set aside. 2. A warrant of liberation for the immediate release of the accused is issued.

Where a mental health expert assessment concludes that a complainant is incapable of giving sound evidence in court, particularly where there are inconsistencies between the observations and the conclusion, the trial court commits a material error by failing to call the expert to testify and clarify the assessment in terms of s 278(12) of the Criminal Procedure and Evidence Act. Mental capacity is a question of fact that requires expert medical testimony, and a court cannot conduct a rationalization exercise to accept evidence without properly testing the expert opinion through testimony and cross-examination. Such failure renders the conviction unsafe.

The court noted obiter that there is a dearth of case law in Zimbabwe regarding complainants with mental health challenges, in contrast to the significant development of law regarding accused persons with such challenges. The court also endorsed, with approval, the reasoning in R v K 1951 (4) SA 49 (O) and the views of Hoffman & Zeffert that a person who may be an imbecile should not automatically be excluded from testifying if they have demonstrable ability to do so, particularly in sexual offence cases where it would be impossible to prove the charge without the complainant's evidence. Incompetence from mental disorder is relative and only lasts as long as the mental illness lasts. The court distinguished Machona v The State on the basis that in that case the central issue was consent, whereas in the present matter the issue was the reliability and competence of the complainant's evidence itself.

This case is significant in Zimbabwean criminal law as it addresses the evidentiary requirements when dealing with complainants who have mental health challenges. It establishes that where a mental health expert concludes a complainant is incapable of giving sound evidence, the expert must be called to testify to clarify the assessment and be subject to examination, particularly where there are apparent inconsistencies in the report. The case highlights the gap in case law regarding mentally challenged complainants (as opposed to accused persons) and reinforces that expert medical evidence is essential in determining mental competency to testify. It also emphasizes that courts cannot simply rationalize away expert conclusions without hearing from the expert directly.