The binding legal principles established are: (1) Where a court finds that a witness understands the nature and import of an oath, that witness must be sworn in under section 162 of the Criminal Procedure Act before testifying - failure to do so renders the evidence inadmissible. (2) Section 164 of the CPA (allowing admonishment in lieu of oath) can only be applied where a court finds that a witness does NOT understand the nature and import of the oath. (3) Proper admonishment under section 164 must include warning the witness about consequences of untruthfulness - diluting or removing this warning fails to meet statutory requirements. (4) Testimony given without proper oath administration, affirmation, or proper admonishment lacks the status and character of evidence and is inadmissible, rendering a trial unfair and prejudicing the accused's right to a fair trial. (5) The cautionary rules applicable to single child witnesses must be applied, including assessment of the child's power of observation, recollection, and narration, and consideration of potential unreliability due to lack of judgment, immaturity, inexperience, imaginativeness, and susceptibility to influence. (6) In the absence of corroboration, courts must look for features in the evidence giving it a hallmark of trustworthiness before relying on a single child witness's evidence.