Which of the following statements is true regarding the importance of personal knowledge in witness testimony?

The statement regarding personal knowledge being a legal requirement for admissibility is accurate because, under the rules of evidence, a witness must have personal knowledge of the matter about which they are testifying. This requirement is rooted in the principle that testimony should be based on firsthand experience to ensure reliability and credibility. Personal knowledge allows the witness to provide factual accounts rather than hearsay or uninformed opinions, which are generally not admissible in court.

This requirement applies to both lay witnesses and expert witnesses, as personal knowledge supports the authenticity of their testimony. Expert witnesses must also demonstrate that their opinions are grounded in knowledge acquired through experience, education, or specialized skills. Therefore, the concept of personal knowledge directly influences the admissibility and weight of testimony.

In contrast, the other statements do not accurately represent the requirements surrounding witness testimony. The irrelevance to credibility contradicts established legal doctrine, as personal knowledge significantly impacts a witness's reliability. The assertion that it only applies to expert witnesses overlooks its broader application, including lay witnesses, and stating it can be disregarded in favor of opinion misrepresents the need for evidentiary support behind any testimony given in court.