A witness may testify to a matter only if evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter. Evidence to prove personal knowledge may consist of the witness's own testimony. This rule does not apply to a witness's expert testimony under Rule 703.
Ariz. R. Evi. 602
COMMENT TO 2012 AMENDMENT
The language of Rule 602 has been amended to conform to the federal restyling of the Evidence Rules to make them more easily understood and to make style and terminology consistent throughout the rules. These changes are intended to be stylistic only. There is no intent to change any result in any ruling on evidence admissibility.
HISTORICAL NOTE
Source:
Federal Rules of Evidence, Rule 602.