California, United States of America
The following excerpt is from People v. Saavedra, F062794 (Cal. App. 2012):
In making such a motion, "'[all] that is required of [the moving party] is that he signify with some certainty how materials not included in the normal transcript may be useful to him on appeal.'" (People v. Gaston (1978) 20 Cal.3d 476, 482.) "The showing of 'some certainty' must be made as to the manner in which the materials may be useful, not as to the contents of the materials themselves." (Ibid.)
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