Cal. Educ. Code § 48213

If a pupil is excluded from attendance pursuant to Section 120230 of the Health and Safety Code or Section 49451 of this code, or if a principal or his or her designee determines that the continued presence of the child would constitute a clear and present danger to the life, safety, or health of a pupil or school personnel, the governing board is not required to send prior notice of the exclusion to the parent or guardian of the pupil. The governing board shall send a notice of the exclusion as soon as is reasonably possible after the exclusion.