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This would not typically be prohibited by law, but if the teacher is Jewish and wishes to observe their religious beliefs, they should typically request a reasonable accommodation from the employer, such as testing on a different day.
Federal law prohibits employers from discriminating against employees
based on their religion and must normally provide reasonable accommodations to permit them to observe their religious beliefs.
Here is a link that summarizes the law on this issue:
If the employer refuses to provide a reasonable accommodation, then a grievance should be filed or a complaint filed with the EEOC if it is not promptly resolved internally.
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