California, United States of America
The following excerpt is from People v. Vang, 104 Cal.Rptr.2d 704, 87 Cal. App. 4th 554 (Cal. App. 2001):
"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."
In People v. Cline (1998) 60 Cal.App.4th 1327, at page 1334, the court explained the standard of review:
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