The following excerpt is from Butler v. Ratel, 976 F.2d 736 (9th Cir. 1992):
A defendant is guaranteed only the right to call witnesses in her favor. United States v. Valenzuela-Bernal, 458 U.S. 858, 867 (1982). Accordingly, a defendant must make a showing of how a witness' testimony would have been both material and favorable to the defense before a court can find that a defendant's right to compulsory process has been denied. Id. at 870.
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