California Code, Education Code - EDC § 92640

The Regents of the University of California shall develop policies and procedures to ensure that each campus of the university, in administering any test or examination, permits 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 in the event that 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.