California, United States of America
The following excerpt is from People v. Allen, C051987 (Cal. App. 5/23/2007), C051987 (Cal. App. 2007):
A jury's verdict may not be impeached by inquiry into the jurors' mental processes, and evidence of how the jurors understood the trial court's instructions is not competent. (People v. Steele (2002) 27 Cal.4th 1230, 1261; see also Evid. Code, 1150 [no evidence is admissible concerning the mental processes by which a verdict was determined].)
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