At my school an instructor cannot prevent a student from leaving an exam to go to the bathroom if they insist. Keep in mind these exams can be four hours long.

At my school an instructor cannot prevent a student from leaving an exam to go to the bathroom if they insist. Keep in mind these exams can be four hours long. Don't recall for sure if it's a CYA policy or the state law, tend to think it was the latter. They can claim it's not allowed, but more savvy students will know better and you have to allow them. You can however have a TA accompany them and wait outside the stall. You can also make them leave their phone but of course they can keep another phone on them.