California, United States of America
The following excerpt is from People v. Chavez, B253686 (Cal. App. 2016):
questioning of prosecution witnesses [or examination of defense experts] and that would have produced a more favorable result at trial. [] . . . Such claims must be supported by declarations or other proffered testimony establishing both the substance of the omitted evidence and its likelihood for exonerating the accused.' " (People v. Bolin (1998) 18 Cal.4th 297, 334.)
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