The binding legal principles established are: (1) For a conviction of rape to be sustained, the State must prove penetration beyond reasonable doubt as required in law. Evidence that an accused had 'sexual intercourse' with the complainant, without explanation of what the complainant understood this term to mean, is insufficient to prove the element of penetration; (2) Medical evidence showing evidence of penetration, without establishing when such penetration occurred, cannot alone prove that the accused committed the rape, particularly where there is evidence of consensual intercourse within a proximate time period; (3) An alibi defence must be properly evaluated and cannot be rejected on the basis of incorrect factual assumptions by the trial court, particularly where those assumptions are based on the court's own unsubstantiated calculations rather than evidence; (4) Where the State fails to prove all elements of an offence beyond reasonable doubt, and where the accused's evidence is of such a nature that it cannot be concluded it is not reasonably possibly true, the accused is entitled to an acquittal; (5) A trial court cannot rely on medical evidence 'given' by a doctor who did not actually testify but whose report was merely handed in by consent without oral evidence being led or cross-examination conducted.