In Goss v. Lopez (1975) 419 U.S. 565, the high court held that where exclusion from the public educational process on disciplinary grounds involves a suspension of not more than 10 days, the student is only entitled to minimal due process consisting of "oral or written notice of charges against him and, if he denies them, an explanation of the evidence the authorities have and an opportunity to present his side of the story." ( Goss v. Lopez, supra , 419 U.S. 565, 581.) Goss, however, cautioned that "longer suspensions or expulsions for the remainder of the school term, or permanently, may require more formal procedures." ( Id. , at p. 584.)