Elizabeth Mukomba v The State

The appellant was convicted of assault as defined in s 89(1) of the Criminal Law (Codification & Reform) Act and sentenced to pay a fine of US$80 or 20 days imprisonment. The complainant was employed by the appellant as a shop-keeper. On 21 December 2012, the appellant allegedly confronted the complainant over a shortfall in daily cash takings. The prosecution alleged that the appellant asked her husband to leave the room before assaulting the complainant with a sjambok all over her body. The complainant only reported the assault to police on 30 December 2012, nine days later. The appellant denied the assault, claiming that the complainant was assaulted by her paramour's wife before the medical examination and that the allegations were fabricated to pre-empt embezzlement charges. A defence witness confirmed that the complainant was assaulted by someone else on 29 December 2012. The trial court convicted the appellant based solely on the complainant's evidence, finding her to be a credible witness and rejecting the appellant's defence.

• Whether the conviction could be sustained on the uncorroborated evidence of a single witness
• Whether the trial court properly tested the reliability of the complainant's evidence against the probabilities
• Whether the State had adequately discharged the burden of proof beyond reasonable doubt
• Whether the trial court should have called additional witnesses under s 232 of the Criminal Procedure and Evidence Act to clarify critical issues

The appeal succeeded. The conviction was set aside and the sentence quashed. The judgment of the court a quo was substituted with: 'The accused is found not guilty and acquitted.'

The binding legal principles established are: (1) Evidence of a single witness, even if the law permits conviction upon it, must be approached with caution and tested against the probabilities of the case; (2) Where alternative explanations exist that cast doubt on critical issues (such as the source of injuries), the State must adduce evidence to discount those possibilities; (3) An accused person bears no onus to prove innocence and is entitled to acquittal if she puts forward an explanation that is reasonably possibly true; (4) A conviction cannot be sustained where the State fails to eliminate reasonable doubt, particularly where critical witnesses (such as medical examiners and eyewitnesses to demeanour) are not called to testify on material issues; (5) Trial courts should exercise their power under s 232 of the Criminal Procedure and Evidence Act to call necessary witnesses where their evidence would clarify material issues raised by either party.

The Court made extensive observations on the proper approach to single witness testimony, citing and endorsing South African authorities including S v Banana 2000 (3) SA 885, R v Mokoena 1932 OPD 79, S v Sauls and Others 1981 (3) SA 172 (A), and Zimbabwean cases S v Nyati 1977 (2) ZLR 315 (A) and S v Nathoo Supermarket (Pvt) Ltd 1987 (2) ZLR 136 (SC). The Court observed that there is no magic formula or inflexible rule of thumb for determining when conviction on single witness testimony is warranted. Rather, a common-sense approach must be applied, weighing the merits and demerits of the evidence. The Court noted that while corroboration is not essential, any feature that increases confidence in the reliability of a single witness may overcome the required caution. The Court also observed that corroboration indicating the story was not concocted may facilitate acceptance of single witness testimony.

This case reaffirms important principles in Zimbabwean criminal law regarding the evaluation of single witness testimony and the burden of proof. It emphasizes that while conviction on single witness evidence is permissible, trial courts must approach such evidence with caution and test it against probabilities. The case highlights the court's power under s 232 of the Criminal Procedure and Evidence Act to call additional witnesses to clarify evidence, and reinforces that the prosecution bears the burden of proof beyond reasonable doubt. It serves as a reminder that accused persons need only raise a reasonably possibly true explanation to be entitled to acquittal, without bearing any onus to prove innocence. The judgment demonstrates the importance of calling crucial witnesses, particularly medical witnesses, to resolve contradictions in evidence.