That's surprise me, but it won't happen to us.
For children with illness, parents are required to write their note for school since children are sick and absent will excused after approve with note, if not then unexcuse and affect children's grade and worksheet (such as get 0 on all worksheet and additional discipline maybe required).
I don't know about school policies in Illinois but probably new to me but wait until I get future children then would find out.