Ephraim Ncube v The State

The appellant was convicted of rape as defined in section 65(1) of the Criminal Law (Codification and Reform) Act by the Regional Magistrate at Bulawayo on 17 November 2011. He was sentenced to 20 years imprisonment, with 4 years suspended for 5 years on condition of good behaviour. The complainant was a mentally retarded woman who testified that the appellant entered her room at night, lit matches, twisted her neck to prevent her from screaming, and raped her after a child named Nicola ran away. The appellant gave her R10 afterwards. The appellant pleaded not guilty and appealed against conviction only, raising two main issues: identification and the complainant's capacity to testify due to her alleged mental retardation. The appellant did not dispute being at the scene but claimed he was looking for someone named Madu.

• Whether the identification evidence was sufficient to support the conviction
• Whether a mentally retarded person can be a competent witness without expert psychiatric evidence
• What standard must be met for a mentally incompetent person to give valid testimony in a rape case
• Whether the prosecution must lead expert evidence on the extent of a witness's mental competence in cases involving mentally retarded witnesses

The appeal against conviction was dismissed. The conviction for rape and sentence of 20 years imprisonment (with 4 years suspended for 5 years on condition of good behaviour) were upheld.

A mentally retarded person can be a competent witness in criminal proceedings without expert psychiatric evidence if they can testify sensibly and logically, and their testimony is materially consistent and reliably corroborated by independent evidence. Under section 246 of the Criminal Procedure and Evidence Act, the test is whether the witness is under the influence of mental disability or malady at the time of testifying, not whether they have some degree of mental retardation. For identification evidence, where an accused does not dispute being at the scene and provides details that corroborate witness testimony, coupled with positive identification by light and voice, the identification is properly established.

The court observed that while expert evidence on mental competence was not strictly necessary in this case due to the reliable corroboration, prosecutors should ideally lead expert evidence on the extent of a witness's mental competence in most cases involving mentally retarded witnesses. This is because not every case will feature such consistent testimony reliably corroborated by independent witnesses. Where there is an indication of mental retardation, the prosecutor should lead expert evidence on the depth of the mental retardation as a matter of best practice.

This case provides important guidance on the admissibility of testimony from mentally retarded witnesses in Zimbabwean criminal proceedings, particularly in sexual offence cases. It clarifies that expert psychiatric evidence is not always necessary if the witness can testify sensibly and coherently, though the court encouraged prosecutors to lead such evidence in most cases involving mentally retarded witnesses. The judgment also interprets section 64(3) of the Criminal Law (Codification and Reform) Act, showing how it changed the law regarding sexual offences against mentally incompetent persons by requiring proof that they were incapable of consent or did not consent, rather than automatically criminalizing all such conduct.