California Code, Education Code - EDC § 89320

(a) The Trustees of the California State University shall require each state university, in administering any test or examination, to permit any student who is eligible to undergo the test or examination to do so, without penalty, at a time when that activity would not violate the student's religious creed.  This requirement shall not apply if administering the test or examination at an alternate time would impose an undue hardship that could not reasonably have been avoided.  In any court proceeding in which the existence of an undue hardship that could not reasonably have been avoided is an issue, the burden of proof shall be upon the institution.

(b) As used in this section, “undue hardship” means an action requiring significant difficulty or expense, when considered in light of the following factors: