The absence of DNA evidence at a crime scene does not prove that the alleged conduct did not occur at that location; the distinction between evidence of absence and absence of evidence must be maintained. Competence of child witnesses is a preliminary question under s 189 of the Evidence Act 2011 (ACT) and is generally determined in the absence of the jury. The Crown's duty to call material witnesses does not extend to calling a very young child where there is no basis for identifying the child as a material witness.
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