All student requests to be excused from classes are the responsibility of the faculty member teaching the course. The only excused absence that is a part of University policy involves institutional travel which must be approved by the Vice President for Academic Affairs. Students participating in approved University-related travel are to be excused from classes but are still responsible for making up any missed assignments and/or tests.
It is up to the discretion of individual faculty members whether other extenuating circumstances should be considered for an excused absence. The Dean's office does not make these judgments for faculty.