What rights does a prisoner have to prepare his defense at a disciplinary hearing?

the prisoner may prepare his defense; (3) a written statement by the fact finders of the evidence they rely on and reasons for taking disciplinary action; (4) the right of the prisoner to call witnesses and present documentary evidence in his defense, when permitting him to do so would not be unduly hazardous to institutional safety or correctional goals; and (5) legal assistance to the prisoner where the prisoner is illiterate or the issues presented are legally complex. Id. at 563-71. As long as the five minimum Wolff requirements are met, due process has been satisfied. Walker v. Sumner, 14 F.3d 1415, 1420 (9th Cir. 1994).