[raybbr]

...unless the disability is so severe that it causes harm to the student or to others.

Is that merely physical harm or does impeding the learning process of others constitute harm?

[SoftballMominVA]

...unless the disability is so severe that it causes harm to the student or to others. Is that merely physical harm or does impeding the learning process of others constitute harm?

It can be either. But the second is harder to prove.