California, United States of America
The following excerpt is from Sievers v. Hill, C073413 (Cal. App. 2014):
After the trial begins, the court may substitute a juror with an alternate if good cause is shown and discovering a ground for disqualification during trial may be good cause. (Code Civ. Proc., 233.)3 A trial court's decision whether to remove a juror is reviewed for an abuse of discretion. (People v. Marshall (1996) 13 Cal.4th 799, 843.)
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