The following excerpt is from Tafoya v. Ducharme, 120 F.3d 269 (9th Cir. 1997):
"Generally, an inmate is allowed to present witnesses and documentary evidence when to do so does not threaten institutional safety or correctional goals." Zimmerlee, 831 F.2d at 187; see Wolff v. McDonnell, 418 U.S. 539, 566 (1974). Prison officials may exercise the necessary discretion to keep a hearing within reasonable limits and to refuse to call witnesses based on irrelevance, lack of necessity, or the hazards presented in individual cases. See Wolff, 418 U.S. at 566.
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