It shall be the duty of the judge to control all proceedings during the trial, and to limit the introduction of evidence and the argument of counsel to relevant and material matters, with a view to the expeditious and effective ascertainment of the truth regarding the matters involved. COURT DECISIONS: DISTRICT COURT, APP. DIV. 1978. The discussion of prior testimony with a future government expert (medical) witness by prosecutor did not violate an order excluding all witnesses from the court before they were called. In any event, the witnesses objected to by Defendant had been excluded from the effect of the Exclusion Order. People v. Camacho, D.C. Guam, App. Div., Cr. App. #76-010A, Decided 01/24/78; Aff'd, CA9. NOTE: Section 90.10 is identical to former § 1044. See also Cal. Pen. Code § 1044 (same). See generally B. Witkin, California Criminal Procedure @Trial §§ 432- 442(1963, Supp. 1973).