The judge presiding at trial may not testify as a witness at the trial. A party need not object to preserve the issue.
Ariz. R. Evi. 605
COMMENT TO 2012 AMENDMENT
The language of Rule 605 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 605.