California, United States of America
The following excerpt is from People v. Linares, G051590 (Cal. App. 2017):
But we cannot say the properly admitted evidence is overwhelming and the improperly admitted evidence is merely cumulative. Nor can we find it did not contribute to the verdict, or that it was unimportant in relation to everything else the jury considered on the gang issues. And we cannot decide the true findings were "surely unattributable" (Sullivan v. Louisiana (1993) 508 U.S. 275, 279) to the error.
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