California, United States of America
The following excerpt is from People v. Jones, B230174 (Cal. App. 2012):
A court may exclude from the courtroom any witness not at the time under examination so that such witness cannot hear the testimony of other witnesses. (Evid. Code, 777.) Whether to exclude a witness from the courtroom is a matter that rests in the trial court's discretion. (People v. Valdez (1986) 177 Cal.App.3d 680, 687-688.)
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