The following excerpt is from US v. Archdale, 229 F.3d 861 (9th Cir. 2000):
Not even the improper admission of hearsay testimony over a timely objection requires reversal of a conviction unless "there is a reasonable possibility that the improperly admitted evidence contributed to the conviction." Schneble v. Florida, 405 U.S. 427, 432 (1972). "The error is harmless if it is more probable than not that the prejudice resulting from the error did not materially affect the verdict." Lui , 941 F.2d at 848.
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