[MEDIA SUMMARY] Haarhoff & another v Director of Public Prosecutions, Eastern Cape

The two appellants and a third person (C) were charged with rape in contravention of section 3 of the Criminal Law (Sexual Offences and Related Matters) Amendment Act 32 of 2007. The incident occurred in Pearston, Eastern Cape, where all parties lived in the same neighbourhood. The appellants pleaded not guilty but acknowledged having sexual intercourse with the complainant on separate occasions, claiming it was consensual. C denied having intercourse with the complainant. The complainant was mentally challenged with a mental age of 10 years old. A clinical psychologist assessed the complainant and opined that while she was mentally challenged, she was competent to testify as she could understand the difference between truth and lies and could be admonished. The trial court convicted the two appellants and sentenced them to 20 years imprisonment each, while C was acquitted. The appellants appealed to the full court which dismissed their appeal in a split decision, and then successfully applied for leave to appeal to the Supreme Court of Appeal.

• Whether the complainant had been properly admonished to tell the truth as contemplated in section 164 of the Criminal Procedure Act 51 of 1977
• Whether the complainant's evidence was sufficiently reliable to sustain the appellants' convictions
• Whether the sentences of 20 years imprisonment imposed on the appellants were appropriate
• Whether a mentally challenged person with a mental age of 10 years could competently testify in criminal proceedings

The Supreme Court of Appeal dismissed the appeals against both convictions and sentences. The convictions for rape and sentences of 20 years imprisonment for each appellant were confirmed.

The binding legal principles established are: (1) The enquiry into a witness's competence to testify and their ability to understand the nature and import of an oath or affirmation are two discrete enquiries; (2) A mentally challenged person can be a competent witness if they can understand the difference between truth and falsehood and understand the obligation to tell the truth, even if they have a low mental age; (3) The admonition of a witness under section 164 of the Criminal Procedure Act is valid if, in the context of expert evidence and questioning by the court, it is established that the witness understands the difference between truth and lies and the duty to speak the truth; (4) A witness can be honest, credible and reliable despite not being intelligent; (5) In sentencing for sexual offences, the exploitation of a victim's mental vulnerability is a serious aggravating factor that warrants substantial imprisonment.

The court made an important observation that courts must demonstrate that vulnerable members of society enjoy equal protection of the law. This broader statement about the duty of courts to protect vulnerable persons, while relevant to the case, goes beyond what was strictly necessary to decide the appeal and serves as guidance for future cases involving vulnerable witnesses and victims.

This case is significant in South African jurisprudence for clarifying the legal principles regarding the competence of mentally challenged witnesses to testify in criminal proceedings. It establishes that a person with diminished mental capacity can still be a competent witness if they understand the difference between truth and lies and the duty to speak the truth. The case also reinforces the protection afforded to vulnerable members of society under South African law, particularly in cases of sexual offences where perpetrators exploit the victim's vulnerability. It confirms that courts must demonstrate that vulnerable persons enjoy equal protection of the law, and that taking advantage of a victim's mental vulnerability is a serious aggravating factor in sentencing for sexual offences.