Collective bargaining contracts or board policies may specify, for example, the point at which a stretch
of absence due to illness requires
medical verification, or proscribe the use
of personal
leave on
days adjacent to school holidays.
For example, if a
medical certification stated that an employee would need
leave for one to two
days when the employee suffered a migraine headache and the employee's
absences for his or her last two migraines lasted four
days each, then the increased duration
of absence might constitute a significant change in circumstances allowing the employer to request a recertification in less than 30
days.